CVE-2025-13017: Same-origin policy bypass in the DOM: Notifications component

Q: How do I fix CVE-2025-13017?

firefox: upgrade to 140.5.0, 145.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-13017 being exploited?

CVE-2025-13017 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-13017 affect?

CVE-2025-13017 affects firefox. Severity is high (CVSS 8.1). 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.

Routine

HIGH 8.1UPGRADE

CVE-2025-13017 is a high-severity flaw (CVSS 8.1) affecting firefox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-942
Published	2025-11-11
Last modified	2026-10-23

Publisher (CNA): Mozilla Corporation · Vendor: mozilla

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-11 16:15 UTCPublished CVE record published
2026-10-23 22:10 UTCUpdated Record last modified

mozilla firefox UPGRADE

Affected: < 140.5.0 · < 145.0

Fixed in: 140.5.0, 145.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy firefox || rpm -q firefox || firefox --version

2. UPGRADE to 140.5.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade firefox

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade firefox

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-13017?

firefox: upgrade to 140.5.0, 145.0. Exact commands for each OS are on this page.

Is CVE-2025-13017 being exploited?

CVE-2025-13017 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-13017 affect?

CVE-2025-13017 affects firefox. Severity is high (CVSS 8.1). 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.

How urgent is CVE-2025-13017?

Priority 33/100. High severity

Software pages

Mozilla Firefox vulnerabilities

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References

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