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Vulnerability details: VCID-f2mc-pj1u-4ub4
Vulnerability ID VCID-f2mc-pj1u-4ub4
Aliases CVE-2018-19787
GHSA-xp26-p53h-6h2p
PYSEC-2018-12
Summary An issue was discovered in lxml before 4.2.5. lxml/html/clean.py in the lxml.html.clean module does not remove javascript: URLs that use escaping, allowing a remote attacker to conduct XSS attacks, as demonstrated by "j a v a s c r i p t:" in Internet Explorer. This is a similar issue to CVE-2014-3146.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 4.7 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-19787.json
epss 0.00525 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00525 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00525 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00525 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00525 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00525 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00525 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00525 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00525 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
cvssv3.1 5.4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 6.1 https://github.com/advisories/GHSA-xp26-p53h-6h2p
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-xp26-p53h-6h2p
cvssv4 5.3 https://github.com/advisories/GHSA-xp26-p53h-6h2p
generic_textual MODERATE https://github.com/advisories/GHSA-xp26-p53h-6h2p
cvssv3.1 6.1 https://github.com/lxml/lxml
cvssv4 5.3 https://github.com/lxml/lxml
generic_textual MODERATE https://github.com/lxml/lxml
cvssv3.1 6.1 https://github.com/lxml/lxml/commit/6be1d081b49c97cfd7b3fbd934a193b668629109
cvssv3.1 6.1 https://github.com/lxml/lxml/commit/6be1d081b49c97cfd7b3fbd934a193b668629109
cvssv4 5.3 https://github.com/lxml/lxml/commit/6be1d081b49c97cfd7b3fbd934a193b668629109
generic_textual MODERATE https://github.com/lxml/lxml/commit/6be1d081b49c97cfd7b3fbd934a193b668629109
ssvc Track https://github.com/lxml/lxml/commit/6be1d081b49c97cfd7b3fbd934a193b668629109
cvssv3.1 6.1 https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2018-12.yaml
cvssv4 5.3 https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2018-12.yaml
generic_textual MODERATE https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2018-12.yaml
cvssv3.1 6.1 https://lists.debian.org/debian-lts-announce/2018/12/msg00001.html
cvssv3.1 6.1 https://lists.debian.org/debian-lts-announce/2018/12/msg00001.html
cvssv4 5.3 https://lists.debian.org/debian-lts-announce/2018/12/msg00001.html
generic_textual MODERATE https://lists.debian.org/debian-lts-announce/2018/12/msg00001.html
ssvc Track https://lists.debian.org/debian-lts-announce/2018/12/msg00001.html
cvssv3.1 6.1 https://lists.debian.org/debian-lts-announce/2020/11/msg00044.html
cvssv3.1 6.1 https://lists.debian.org/debian-lts-announce/2020/11/msg00044.html
cvssv4 5.3 https://lists.debian.org/debian-lts-announce/2020/11/msg00044.html
generic_textual MODERATE https://lists.debian.org/debian-lts-announce/2020/11/msg00044.html
ssvc Track https://lists.debian.org/debian-lts-announce/2020/11/msg00044.html
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2018-19787
cvssv4 5.3 https://nvd.nist.gov/vuln/detail/CVE-2018-19787
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2018-19787
cvssv3.1 6.1 https://usn.ubuntu.com/3841-1
cvssv4 5.3 https://usn.ubuntu.com/3841-1
generic_textual MODERATE https://usn.ubuntu.com/3841-1
cvssv3.1 6.1 https://usn.ubuntu.com/3841-1/
ssvc Track https://usn.ubuntu.com/3841-1/
cvssv3.1 6.1 https://usn.ubuntu.com/3841-2
cvssv4 5.3 https://usn.ubuntu.com/3841-2
generic_textual MODERATE https://usn.ubuntu.com/3841-2
cvssv3.1 6.1 https://usn.ubuntu.com/3841-2/
ssvc Track https://usn.ubuntu.com/3841-2/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-19787.json
https://api.first.org/data/v1/epss?cve=CVE-2018-19787
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-19787
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/advisories/GHSA-xp26-p53h-6h2p
https://github.com/lxml/lxml
https://github.com/lxml/lxml/commit/6be1d081b49c97cfd7b3fbd934a193b668629109
https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2018-12.yaml
https://lists.debian.org/debian-lts-announce/2018/12/msg00001.html
https://lists.debian.org/debian-lts-announce/2020/11/msg00044.html
https://usn.ubuntu.com/3841-1
https://usn.ubuntu.com/3841-1/
https://usn.ubuntu.com/3841-2
https://usn.ubuntu.com/3841-2/
1660235 https://bugzilla.redhat.com/show_bug.cgi?id=1660235
CVE-2018-19787 https://nvd.nist.gov/vuln/detail/CVE-2018-19787
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-19787.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/advisories/GHSA-xp26-p53h-6h2p
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/advisories/GHSA-xp26-p53h-6h2p
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/lxml/lxml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/lxml/lxml
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/lxml/lxml/commit/6be1d081b49c97cfd7b3fbd934a193b668629109
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/lxml/lxml/commit/6be1d081b49c97cfd7b3fbd934a193b668629109
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/lxml/lxml/commit/6be1d081b49c97cfd7b3fbd934a193b668629109
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-12-18T15:15:33Z/ Found at https://github.com/lxml/lxml/commit/6be1d081b49c97cfd7b3fbd934a193b668629109
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2018-12.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2018-12.yaml
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://lists.debian.org/debian-lts-announce/2018/12/msg00001.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://lists.debian.org/debian-lts-announce/2018/12/msg00001.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://lists.debian.org/debian-lts-announce/2018/12/msg00001.html
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-12-18T15:15:33Z/ Found at https://lists.debian.org/debian-lts-announce/2018/12/msg00001.html
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://lists.debian.org/debian-lts-announce/2020/11/msg00044.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://lists.debian.org/debian-lts-announce/2020/11/msg00044.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://lists.debian.org/debian-lts-announce/2020/11/msg00044.html
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-12-18T15:15:33Z/ Found at https://lists.debian.org/debian-lts-announce/2020/11/msg00044.html
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2018-19787
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2018-19787
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://usn.ubuntu.com/3841-1
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://usn.ubuntu.com/3841-1
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://usn.ubuntu.com/3841-1/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-12-18T15:15:33Z/ Found at https://usn.ubuntu.com/3841-1/
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://usn.ubuntu.com/3841-2
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N Found at https://usn.ubuntu.com/3841-2
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://usn.ubuntu.com/3841-2/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-12-18T15:15:33Z/ Found at https://usn.ubuntu.com/3841-2/
Exploit Prediction Scoring System (EPSS)
Percentile 0.66906
EPSS Score 0.00525
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:41:53.826244+00:00 Pypa Importer Import https://github.com/pypa/advisory-database/blob/main/vulns/lxml/PYSEC-2018-12.yaml 38.0.0