CVE-2022-26485

Name: CVE-2022-26485
Creator: NVD / NIST
Published: 2022-12-22T20:15:22.563+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10Actively ExploitedEPSS 14.26%

Last modified Jun 17, 2026

CVE-2022-26485 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 14.26% chance of exploitation in the next 30 days.

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

8.8/10

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

EPSS Probability

14.26%

96.1th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Mar 21, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 91.6.1
Mozilla	Firefox	< 97.0.2
Mozilla	Firefox	< 97.3.0
Mozilla	Firefox Focus	< 97.3.0
Mozilla	Thunderbird	< 91.6.2

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1758062Exploit, Issue Tracking, Vendor Advisory
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.mozilla.org/security/advisories/mfsa2022-09/Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-26485US Government Resource

Timeline

Published: Dec 22, 2022
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2022-26485?

How severe is CVE-2022-26485?

CVE-2022-26485 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 14.26% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2022-26485?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-26485?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST