Skip to content
Cyber Threat
CTI Academy Sponsor CTI Academy
HIGH · CVSS 8.8 CISA Known Exploited Vulnerability

CVE-2022-26485

Mozilla Firefox Use-After-Free Vulnerability

Mozilla Firefox

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
EPSS
14.3%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
22 Dec 2022
CWE-416

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 7 March 2022. US federal agencies were required to remediate it by 21 March 2022.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 14.3%, which is higher than 96.6% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

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

Frequently asked questions

Is CVE-2022-26485 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2022-26485.

What does CVE-2022-26485 affect?

CVE-2022-26485 affects Mozilla Firefox. 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.

How severe is CVE-2022-26485?

CVE-2022-26485 is rated HIGH with a CVSS base score of 8.8. EPSS puts the probability of exploitation in the next 30 days at 14.3%, higher than 96.6% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 21 March 2022.

How should organisations respond to CVE-2022-26485?

Apply the vendor patch for Mozilla Firefox as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.