CVE-2022-26387
When installing an add-on, Firefox verified the signature before prompting the user; but while the user was confirming the prompt, the underlying add-on file could have been modified and Firefox would
02 Description
When installing an add-on, Firefox verified the signature before prompting the user; but while the user was confirming the prompt, the underlying add-on file could have been modified and Firefox would
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 0.66% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 51.1% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2022-12-22 00:00Z3 YR AGO
- Last updated
- 2025-04-15 20:10Z1 YR AGO
- Reserved
- 2022-03-03
- Assigning CNA
- mozilla
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.5)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-367Time-of-check Time-of-use (TOCTOU) Race ConditionBase
- Data version
- 5.1
- Document digest
- 95cd0b81d535aa1a7a6a9fb70bee97f4efa5163b4192dfab90792557833dcb1a
05 Affected products
06 References
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2022-12/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2022-10/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2022-11/
- bugzilla.mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=1752979
07 Fixed in
AlmaLinux 8
- firefox Fixed in 91.7.0-3.el8_5.alma
- thunderbird Fixed
A version is affected if any line below covers it.
- Affected before 91.7.0-2.el8_5.alma
- Affected before 91.7.0-2.el8_5.alma.plus
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Arch Linux
- firefox Fixed in 98.0-1
- thunderbird Fixed in 91.7.0-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
CloudLinux 8
- firefox Fixed in 91.7.0-3.el8_5.alma
- thunderbird Fixed
A version is affected if any line below covers it.
- Affected before 91.7.0-2.el8_5.alma
- Affected before 91.7.0-2.el8_5.alma.plus
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- firefox-esr Fixed in 91.7.0esr-1
- thunderbird Fixed in 1:91.7.0-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- firefox-esr Fixed in 91.7.0esr-1
- thunderbird Fixed in 1:91.7.0-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- firefox-esr Fixed in 91.7.0esr-1
- thunderbird Fixed in 1:91.7.0-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- firefox Fixed in 98.0+build3-0ubuntu0.18.04.2
- mozjs38 No fix yet
- mozjs52 No fix yet
- thunderbird Fixed in 1:91.7.0+build2-0ubuntu0.18.04.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- firefox Fixed in 98.0+build3-0ubuntu0.20.04.2
- mozjs52 No fix yet
- mozjs68 No fix yet
- thunderbird Fixed in 1:91.7.0+build2-0ubuntu0.20.04.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- firefox Fixed in 1:1snap1-0ubuntu1
- mozjs78 No fix yet
- thunderbird Fixed in 1:91.7.0+build2-0ubuntu1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.