CVE-2026-109736: Frame Poisoning
Source GCVE Database
Not known to be exploited · CVSS 8.1 High.
Data as of 10 Nov 2026, 16:36 UTC
Thin evidence
One scorer or none| CISA-ADP | CVSS 3.1 | 8.1 |
|---|
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 13 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.
Description
Frame poisoning in the Layout component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.
References
- nvd.nist.gov/vuln/detail/CVE-2026-109736 (opens in a new tab)
- bugzilla.mozilla.org/show_bug.cgi?id=2029784 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2026-106 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2026-108 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2026-109 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2026-110 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2026-126 (opens in a new tab)