CVE-2025-13019: Mozilla Firefox · Vulnerability
Affects Mozilla FirefoxSource CVE Database V5
Not known to be exploited · CVSS 8.1 High : upgrade to 145 soon.
Data as of 26 Oct 2026, 06:26 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 19% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 145
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 11 Nov 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 2026-10-26.
What to do
Upgrade Mozilla Firefox to 145.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Mozilla Firefox | Affected
| Fixed in
|
AI-suggested
Mozilla has released official fixes for this vulnerability in Firefox 145 and Firefox ESR 140.5. Users and administrators should update affected Firefox installations to these versions or later to remediate the vulnerability. Since this is not a cloud service, remediation depends on applying these updates. Patch status is confirmed by the vendor advisories MFSA 2025-87 and MFSA 2025-88.
Description
Same-origin policy bypass in the DOM: Workers component. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, Thunderbird 145, and Thunderbird 140.5.
References
- bugzilla.mozilla.org/show_bug.cgi?id=1988412 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-87/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-88/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-90/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-91/ (opens in a new tab)