CVE-2022-26485

HIGH8.8

CISA KEV

Published 2022-12-22 · Updated 2026-08-19 · Source security@mozilla.org

Summary

CVE-2022-26485 is a high-severity (CVSS 8.8) vulnerability in Mozilla Firefox. CISA added it to the Known Exploited Vulnerabilities catalog on March 7, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by March 21, 2022. CISA does not currently list it as used in ransomware campaigns. Mozilla has 13 vulnerabilities in the KEV catalog, 1 of them linked to ransomware.

All 13 known-exploited Mozilla vulnerabilities →

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.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-416CWE-416

CISA Known-Exploited Vulnerability

Product: Mozilla — Firefox

Name: Mozilla Firefox Use-After-Free Vulnerability

Date added: 2022-03-07 · Due: 2022-03-21

Required action: Apply updates per vendor instructions.

References

View on NVD

More exploited Mozilla vulnerabilities

Most recently added to CISA KEV

CVE-2010-3765
Multiple Products — Mozilla Multiple Products Remote Code Execution Vulnerability
added 2025-10-06
CVE-2024-9680
RANSOMWARE
Firefox — Mozilla Firefox Use-After-Free Vulnerability
added 2024-10-15
CVE-2016-9079
Firefox, Firefox ESR, and Thunderbird — Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability
added 2023-06-22
CVE-2015-4495
Firefox — Mozilla Firefox Security Feature Bypass Vulnerability
added 2022-05-25
CVE-2019-11707
Firefox and Thunderbird — Mozilla Firefox and Thunderbird Type Confusion Vulnerability
added 2022-05-23
CVE-2019-11708
Firefox and Thunderbird — Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability
added 2022-05-23

View all →

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