CVE-2022-26485
High 8.8 Exploited in the wild (KEV)
Confirmed active exploitation — CISA KEV catalog
- Name
- Mozilla Firefox Use-After-Free Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply updates per vendor instructions.
Description
Removing an XSLT parameter during processing could have lead to an exploitable use-after-free. We have had reports of attacks in the wild abusing this flaw. This vulnerability affects Firefox < 97.0.2, Firefox ESR < 91.6.1, Firefox for Android < 97.3.0, Thunderbird < 91.6.2, and Focus < 97.3.0.
Metrics
- CVSS 3.1
-
8.8 (HIGH)
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 14% (percentile: 97) as of 2 November 2026
- CWE
- CWE-416
Affected products
mozilla: firefox; mozilla: firefox focus; mozilla: firefox mobile; mozilla: thunderbird
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1758062 ExploitIssue TrackingVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2022-09/ Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1758062 ExploitIssue TrackingVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2022-09/ Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022… US Government Resource