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VulnerabilityPublished

CVE-2026-117998: Mozilla Firefox · Mitigation bypass in the DOM: Push Subscriptions component

Affects Mozilla FirefoxSource CVE Database V5

0

Not known to be exploited.

Data as of 27 Oct 2026, 17:24 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

Users and administrators should update Firefox to version 159 or later, or Firefox ESR 153.6 or later, where this vulnerability is fixed. Applying the official update fully mitigates the issue. No additional mitigation steps are required beyond applying the vendor-provided patch.

Description

CVE-2026-117998 is a mitigation bypass vulnerability in the DOM Push Subscriptions component of Mozilla Firefox. This issue was addressed and fixed in Firefox version 159 and Firefox ESR 153.6. The vulnerability could allow bypassing security mitigations related to push subscription handling in the browser's DOM. Mozilla has classified the impact as high and released an official fix.

References

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