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CVE-2025-13017VulnerabilityPublished Updated

CVE-2025-13017: Mozilla Firefox · Vulnerability

Affects Mozilla FirefoxSource CVE Database V5

0

Not known to be exploited · CVSS 8.1 High : upgrade to 145 soon.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score
8.1High
How severe the flaw is on the 0–10 CVSS scale.
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Nov 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 2026-10-26.

What to do

Upgrade Mozilla Firefox to 145.

Affected software

ProductAffectedFixed in
Mozilla FirefoxAffected
  • <145
Fixed in
  • 145

AI-suggested

Mozilla has released official fixes for this vulnerability in Firefox 145 and Firefox ESR 140.5. Users and administrators should update their Firefox installations to these versions or later to remediate the issue. Since this is a client-side vulnerability in a non-cloud product, applying the official patches is the recommended mitigation. No additional vendor-recommended mitigations or workarounds are indicated in the advisory.

Description

Same-origin policy bypass in the DOM: Notifications component. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, Thunderbird 145, and Thunderbird 140.5.

References

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