CVE-2022-26485

Q: Is CVE-2022-26485 actively exploited?

Yes. CISA added CVE-2022-26485 to its Known Exploited Vulnerabilities (KEV) catalog on 2022-03-07, with a federal remediation deadline of 2022-03-21. A KEV listing means real-world exploitation is confirmed, so patching this should be prioritized above many higher-CVSS bugs that aren't being exploited.

Q: What is the CVSS score of CVE-2022-26485?

CVE-2022-26485 has a CVSS base score of 8.8 (High). Its vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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…

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CVSS score: 8.8 High
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CISA KEV: Yes — actively exploited (added 2022-03-07, remediation due 2022-03-21)
Weakness (CWE): CWE-416
Published: 2022-12-22
Last modified: 2026-08-19
NVD status: Analyzed

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.

Affected products

mozilla firefox
mozilla firefox focus
mozilla firefox mobile
mozilla thunderbird

Affected ranges per NVD CPE data; confirm exact versions in the vendor advisory.

Required action (CISA)

Apply updates per vendor instructions. Federal remediation deadline: 2022-03-21.

How to prioritize this

This vulnerability is on the CISA KEV list, meaning it is being actively exploited — treat it as urgent regardless of the raw CVSS number. Use the live CVE lookup for the latest NVD data, and the CVSS 3.1 calculator to model your own environmental score. For the actively exploited vulnerabilities that matter this week, read The Exploit HQ daily security brief.

References

FAQ

Is CVE-2022-26485 actively exploited?