VulnerabilityPublished 27 Oct 2026

CVE-2026-118011: Frame Poisoning

Source GCVE Database

Authoritative record:CVE-2026-118011· High

Not known to be exploited.

Data as of 27 Oct 2026, 16:44 UTC

Severity

High

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

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-q583-7wf7-8qjw

What to do

AI-suggested

This vulnerability is fixed in Firefox 159. Users and administrators should update to Firefox version 159 or later to remediate this issue. No additional mitigation steps are required beyond applying the official update.

Description

CVE-2026-118011 is a high-impact security vulnerability involving frame poisoning in the CSS Parsing and Computation component of Firefox. This flaw was addressed and fixed in Firefox version 159. The vulnerability could potentially allow attackers to manipulate CSS frame parsing, leading to security issues. No public exploit code or in-the-wild exploitation has been reported. Users are advised to update to Firefox 159 or later to mitigate this vulnerability.

Impact

The vulnerability has a high impact rating as per the Mozilla advisory. Frame poisoning in the CSS Parsing and Computation component could allow attackers to compromise browser security, potentially leading to unauthorized actions or data exposure. However, no public exploits or active exploitation in the wild have been reported to date.

Summary

This vulnerability, identified as CVE-2026-118011, involves frame poisoning within the CSS Parsing and Computation component of Firefox. Frame poisoning typically refers to an attacker manipulating frame content or context, potentially leading to security breaches such as privilege escalation or information disclosure. Mozilla has fixed this issue in Firefox 159, as documented in their security advisory MFSA 2026-118. The advisory classifies the impact as high and includes this fix among numerous other high-impact vulnerabilities resolved in the same release.

References

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