High 8.8Known exploited (CISA KEV)Published Dec 22, 2022

CVE-2022-26485Removing an XSLT parameter during processing could have lead to an exploitable use-after-free.

Updated under an hour ago (2026-10-19 07:00 UTC)

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It affects Mozilla Firefox and 6 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Mar 7, 2022; federal agencies had to remediate by Mar 21, 2022. Treat that date as your deadline.

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Exploited in the last 30 days

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.

CVSS: 8.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Added to CISA KEV Mar 7, 2022; federal remediation due Mar 21, 2022Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 14.26% (percentile 97)
Assigned by: mozilla
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Mozilla Firefox mozilla:firefox (from the name)	from unspecified before 97.0.2	CNA record
Mozilla Firefox ESR mozilla:firefox_esr (from the name)	from unspecified before 91.6.1	CNA record
Mozilla Firefox for Android mozilla:firefox_for_android (from the name)	from unspecified before 97.3.0	CNA record
Mozilla Thunderbird mozilla:thunderbird (from the name)	from unspecified before 91.6.2	CNA record
Mozilla Focus mozilla:focus (from the name)	from unspecified before 97.3.0	CNA record
mozilla firefox mozilla:firefox	before 91.6.1; before 97.0.2	NVD
mozilla firefox_focus mozilla:firefox_focus	before 97.3.0	NVD
mozilla firefox_mobile mozilla:firefox_mobile	before 97.3.0	NVD
mozilla thunderbird mozilla:thunderbird	before 91.6.2	NVD

References

https://www.mozilla.org/security/advisories/mfsa2022-09/vendor-advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1758062exploit, issue-tracking, vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-26485us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.