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VulnerabilityPublished

CVE-2026-124887: Incorrect Boundary Conditions

Source GCVE Database

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Authoritative record:CVE-2026-124887· High 8.8

Not known to be exploited · CVSS 8.8 High.

Data as of 10 Nov 2026, 17:17 UTC

CVSS 3.1 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CISA-ADPCVSS 3.18.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: 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 10 Nov 2026.

What to do

AI-suggested

This vulnerability has been fixed in Firefox 160 and Firefox ESR 153.7. Users and administrators should update to these versions or later to remediate the issue. No additional mitigation actions are required beyond applying the official patches provided by Mozilla.

Description

CVE-2026-124887 is a high severity vulnerability involving incorrect boundary conditions in the Layout: Text and Fonts component of Firefox. This flaw was addressed and fixed in Firefox 160 and Firefox ESR 153.7. The vulnerability could allow an attacker to cause significant impact on confidentiality, integrity, and availability if exploited.

References

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