Firefox <97 + ESR <91.6.1 - XSLT Param Removal UAF
CVE-2022-26485 Published on December 22, 2022
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.
Known Exploited Vulnerability
This Mozilla Firefox Use-After-Free Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Mozilla Firefox contains a use-after-free vulnerability in XSLT parameter processing which can be exploited to perform arbitrary code execution.
The following remediation steps are recommended / required by March 21, 2022: Apply updates per vendor instructions.
Vulnerability Analysis
CVE-2022-26485 can be exploited with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2022-26485 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2022-26485
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Affected Versions
Mozilla Firefox:- Version unspecified and below 97.0.2 is affected.
- Version unspecified and below 91.6.1 is affected.
- Version unspecified and below 97.3.0 is affected.
- Version unspecified and below 91.6.2 is affected.
- Version unspecified and below 97.3.0 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.