VulnerabilityPublished 27 Oct 2026

CVE-2026-118027: Frame Poisoning

Source GCVE Database

Authoritative record:CVE-2026-118027· High

Not known to be exploited · fixed in 115.44 : patch Firefox soon.

Data as of 27 Oct 2026, 16:42 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Patch: Available – fixed in 115.44

Exploitation evidence

Disclosed: evidence found.
CVE published 27 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-38v7-8p8g-jfff

What to do

AI-suggested

Users should update Firefox ESR to version 115.44 or later to remediate this vulnerability. The vendor advisory confirms that the issue is fixed in this release. No additional mitigation steps are indicated or required beyond applying the official update.

Description

CVE-2026-118027 is a frame poisoning vulnerability in the Layout component of Firefox ESR. This security flaw was addressed and fixed in Firefox ESR version 115.44. The vulnerability is considered high impact by the vendor. No public exploit or active exploitation in the wild has been reported. Users of affected versions should upgrade to the fixed release to mitigate the risk.

Impact

The vulnerability is rated as high impact by Mozilla, indicating it could allow attackers to compromise the security of the Firefox ESR browser through manipulation of the Layout component. Specific exploitation details are not provided, and no known exploits in the wild have been reported. The impact likely involves potential memory safety or privilege escalation issues within the browser's rendering engine.

Summary

This vulnerability involves frame poisoning in the Layout component of Firefox ESR. Frame poisoning typically refers to manipulation or corruption of frame data structures, which can lead to security issues such as memory corruption or privilege escalation. Mozilla fixed this issue in Firefox ESR 115.44 as part of a security advisory that addressed multiple high-impact vulnerabilities. The advisory confirms the impact as high and lists the fixed version explicitly.

References

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