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VulnerabilityPublished Updated

CVE-2025-11153: Mozilla Firefox · Code Injection

Affects Mozilla FirefoxSource CVE Database V5

0

Not known to be exploited · CVSS 7.5 High : upgrade to 143.0.3 soon.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 143.0.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Sep 2025

  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

Upgrade Mozilla Firefox to 143.0.3.

Affected software

ProductAffectedFixed in
Mozilla FirefoxAffected
  • <143.0.3
Fixed in
  • 143.0.3

AI-suggested

Mozilla has released an official fix for this vulnerability in Firefox version 143.0.3. Users and administrators should update affected Firefox installations to version 143.0.3 or later to remediate this issue. No additional mitigation steps are indicated beyond applying the official update.

Description

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 143.0.3.

References

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