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Vulnerability details: VCID-m52b-aa6v-8yae
Vulnerability ID VCID-m52b-aa6v-8yae
Aliases CVE-2019-11730
Summary A vulnerability exists where if a user opens a locally saved HTML file, this file can use file: URIs to access other files in the same directory or sub-directories if the names are known or guessed. The Fetch API can then be used to read the contents of any files stored in these directories and they may uploaded to a server. Luigi Gubello demonstrated that in combination with a popular Android messaging app, if a malicious HTML attachment is sent to a user and they opened that attachment in Firefox, due to that app's predictable pattern for locally-saved file names, it is possible to read attachments the victim received from other correspondents.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-829 Inclusion of Functionality from Untrusted Control Sphere
System Score Found at
cvssv3 6.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11730.json
epss 0.34646 https://api.first.org/data/v1/epss?cve=CVE-2019-11730
epss 0.34646 https://api.first.org/data/v1/epss?cve=CVE-2019-11730
epss 0.34646 https://api.first.org/data/v1/epss?cve=CVE-2019-11730
epss 0.34646 https://api.first.org/data/v1/epss?cve=CVE-2019-11730
epss 0.34646 https://api.first.org/data/v1/epss?cve=CVE-2019-11730
epss 0.34646 https://api.first.org/data/v1/epss?cve=CVE-2019-11730
epss 0.34646 https://api.first.org/data/v1/epss?cve=CVE-2019-11730
epss 0.34646 https://api.first.org/data/v1/epss?cve=CVE-2019-11730
epss 0.34646 https://api.first.org/data/v1/epss?cve=CVE-2019-11730
epss 0.34646 https://api.first.org/data/v1/epss?cve=CVE-2019-11730
epss 0.34646 https://api.first.org/data/v1/epss?cve=CVE-2019-11730
epss 0.34646 https://api.first.org/data/v1/epss?cve=CVE-2019-11730
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2019-11730
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2019-11730
archlinux Critical https://security.archlinux.org/AVG-1002
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-21
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-22
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-23
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-28
Reference id Reference type URL
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00055.html
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00058.html
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00073.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11730.json
https://api.first.org/data/v1/epss?cve=CVE-2019-11730
https://bugzilla.mozilla.org/show_bug.cgi?id=1558299
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11709
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11711
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11712
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11713
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11715
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11717
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11730
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9811
https://lists.debian.org/debian-lts-announce/2019/08/msg00001.html
https://lists.debian.org/debian-lts-announce/2019/08/msg00002.html
https://security.gentoo.org/glsa/201908-20
https://www.mozilla.org/security/advisories/mfsa2019-21/
https://www.mozilla.org/security/advisories/mfsa2019-22/
https://www.mozilla.org/security/advisories/mfsa2019-23/
1728438 https://bugzilla.redhat.com/show_bug.cgi?id=1728438
ASA-201907-4 https://security.archlinux.org/ASA-201907-4
AVG-1002 https://security.archlinux.org/AVG-1002
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
CVE-2019-11730 https://nvd.nist.gov/vuln/detail/CVE-2019-11730
mfsa2019-21 https://www.mozilla.org/en-US/security/advisories/mfsa2019-21
mfsa2019-22 https://www.mozilla.org/en-US/security/advisories/mfsa2019-22
mfsa2019-23 https://www.mozilla.org/en-US/security/advisories/mfsa2019-23
mfsa2019-28 https://www.mozilla.org/en-US/security/advisories/mfsa2019-28
RHSA-2019:1763 https://access.redhat.com/errata/RHSA-2019:1763
RHSA-2019:1764 https://access.redhat.com/errata/RHSA-2019:1764
RHSA-2019:1765 https://access.redhat.com/errata/RHSA-2019:1765
RHSA-2019:1775 https://access.redhat.com/errata/RHSA-2019:1775
RHSA-2019:1777 https://access.redhat.com/errata/RHSA-2019:1777
RHSA-2019:1799 https://access.redhat.com/errata/RHSA-2019:1799
USN-4054-1 https://usn.ubuntu.com/4054-1/
USN-4064-1 https://usn.ubuntu.com/4064-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11730.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: AV:N/AC:M/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11730
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:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11730
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 0.96844
EPSS Score 0.34646
Published At Aug. 5, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:57.305681+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2019/mfsa2019-22.yml 37.0.0