VulnerabilityPublished 27 Oct 2026

CVE-2026-118027: Mozilla Firefox · Frame Poisoning in the Layout Component

Affects Mozilla FirefoxSource CVE Database V5

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

Data as of 27 Oct 2026, 14:42 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.

What to do

AI-suggested

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

Description

CVE-2026-118027 is a frame poisoning vulnerability in the Layout component of Mozilla Firefox. This security flaw was addressed and fixed in Firefox ESR version 115.44. The vulnerability is considered high impact by Mozilla. No public exploit or active exploitation in the wild has been reported. The fix is available in the specified ESR release.

Impact

The vulnerability is rated as high impact by Mozilla, indicating it could lead to serious security consequences if exploited. However, there are no known exploits in the wild at this time. The issue affects the Layout component, which is critical for rendering web content securely and correctly.

Summary

This vulnerability involves frame poisoning within the Layout component of Firefox. Frame poisoning can allow an attacker to manipulate or corrupt frame content, potentially leading to security issues such as privilege escalation or information disclosure. Mozilla has fixed this issue in Firefox ESR 115.44 as part of a broader security update addressing multiple high-impact vulnerabilities across various components. The advisory confirms the fix and categorizes the impact as high.

References

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 27 Oct 2026, 14:30 UTC

Technical details

References

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