CVE-2025-11153: Mozilla Firefox · Code Injection
Affects Mozilla FirefoxSource CVE Database V5
Not known to be exploited · CVSS 7.5 High : upgrade to 143.0.3 soon.
Data as of 26 Oct 2026, 17:16 UTC
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 30 Sep 2025
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.
What to do
Upgrade Mozilla Firefox to 143.0.3.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Mozilla Firefox | Affected
| Fixed in
|
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.