# CVE-2022-26485: Mozilla Firefox Use-After-Free Vulnerability

> CVE-2022-26485: Mozilla Firefox Use-After-Free Vulnerability. CVSS 8.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2022-26485
Last updated: 2025-10-21T23:15:29Z

- Published: 2022-12-22 00:00 UTC · Updated: 2025-10-21 23:15 UTC · Assigner: mozilla
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 14.3%, 97th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-03-07, federal due date 2022-03-21, ransomware use: Unknown

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Mozilla: Firefox
- Mozilla: Firefox ESR
- Mozilla: Firefox for Android
- Mozilla: Focus
- Mozilla: Thunderbird

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2022-26485)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2022-26485)
- [https://bugzilla.mozilla.org/show\_bug.cgi?id=1758062](https://bugzilla.mozilla.org/show_bug.cgi?id=1758062)
- [https://www.mozilla.org/security/advisories/mfsa2022-09/](https://www.mozilla.org/security/advisories/mfsa2022-09/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2022-26485 · Markdown: https://rewindex.com/cve/CVE-2022-26485.md · JSON: https://rewindex.com/api/v1/cves/CVE-2022-26485 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:14:52.918Z