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VulnerabilityPublished

CVE-2026-117862: Mozilla Firefox · Privilege escalation due to incorrect boundary conditions in the Networking component

Affects Mozilla FirefoxSource CVE Database V5

0

Not known to be exploited.

Data as of 27 Oct 2026, 16:12 UTC

Severity
High

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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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.

What to do

AI-suggested

A fix for this vulnerability is available and has been incorporated into Firefox 159 and Firefox ESR 115.44 and 153.6. Users and administrators should update to these versions or later to remediate the issue. No additional mitigation actions are required as the vulnerability is addressed by the official patch.

Description

CVE-2026-117862 is a privilege escalation vulnerability in the Networking component of Mozilla Firefox. It arises from incorrect boundary conditions that could allow an attacker to gain elevated privileges. This issue has been fixed in Firefox 159 and Firefox ESR versions 115.44 and 153.6.

References

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