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Vulnerability details: VCID-m978-e1qe-syek
Vulnerability ID VCID-m978-e1qe-syek
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 0.00269 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00269 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00269 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00269 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00269 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00274 https://api.first.org/data/v1/epss?cve=CVE-2018-19787
epss 0.00282 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
generic_textual MODERATE https://github.com/advisories/GHSA-xp26-p53h-6h2p
cvssv3.1 6.1 https://github.com/lxml/lxml
generic_textual MODERATE https://github.com/lxml/lxml
cvssv3.1 6.1 https://github.com/lxml/lxml/commit/6be1d081b49c97cfd7b3fbd934a193b668629109
generic_textual MODERATE 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
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
generic_textual MODERATE 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
generic_textual MODERATE https://lists.debian.org/debian-lts-announce/2020/11/msg00044.html
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2018-19787
cvssv3 6.1 https://nvd.nist.gov/vuln/detail/CVE-2018-19787
cvssv3.1 6.1 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
generic_textual MODERATE https://usn.ubuntu.com/3841-1
cvssv3.1 6.1 https://usn.ubuntu.com/3841-2
generic_textual MODERATE 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://nvd.nist.gov/vuln/detail/CVE-2018-19787
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
cpe:2.3:a:lxml:lxml:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:lxml:lxml:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
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)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
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)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
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)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
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)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
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)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
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)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
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)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
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)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2018-19787
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
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)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
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)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
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)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
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)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.50238
EPSS Score 0.00269
Published At Sept. 19, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:07:20.129851+00:00 Pypa Importer Import https://github.com/pypa/advisory-database/blob/main/vulns/lxml/PYSEC-2018-12.yaml 37.0.0