Privilege Escalation in Mozilla Graphics: WebRender
CVE-2026-12289 is a privilege escalation vulnerability in Mozilla's Graphics: WebRender component affecting Firefox and related ESR releases prior to the fixed versions. Mozilla describes the issue only at a high level as a privilege escalation flaw in WebRender. The available record does not provide vulnerable function-level details or a root-cause narrative, but the CVE metadata classifies it as CWE-269 and the CVSS v3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) indicates a remotely triggerable issue requiring user interaction and no prior privileges.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Recent activity
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.