Threats / Mozilla / CVE-2022-26485
CVE-2022-26485
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Mozilla Firefox vulnerability
Mozilla Firefox contains a use-after-free vulnerability in XSLT parameter processing that enables arbitrary code execution.
Verdict
Today item — known-exploited.
A use-after-free flaw in Firefox's XSLT parameter handling allows attackers to execute arbitrary code through crafted content. The vulnerability has been observed in active exploitation in the wild.
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Public proof-of-concept exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
6 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-07).
Probability (EPSS)
EPSS 0.14261 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Mozilla, Firefox. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-416 Use After Free — weakness family: Memory safety.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft malicious XSLT content with specially formed parameters to trigger a use-after-free condition in Firefox's processing engine.
Business
Users visiting attacker-controlled or compromised websites face arbitrary code execution on their systems without additional user interaction.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I deliver the malicious XSLT payload through web content, email attachments, or compromised legitimate websites to reach target Firefox users.
Business
Attackers gain code execution capability on victim machines, enabling data theft, malware installation, or lateral movement within networks.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05