CVE-2025-13019 — Permissive Cross-domain Security Policy with Untrusted Domains in Mozilla Firefox

CWE-942 — Permissive Cross-domain Security Policy with Untrusted DomainsCWE-346 — Origin Validation Error11 documents8 sources
Severity
8.1HIGHNVD
EPSS
0.0%
top 93.05%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla ThunderbirdMozilla Firefox
Timeline
PublishedNov 11
Latest updateFeb 2

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:NExploitability: 2.8 | Impact: 5.2

Affected Packages2 packages

▶NVDmozilla/firefox< 140.5.0+1
▶Debianmozilla/thunderbird< 1:140.5.0esr-1~deb11u1+3

🔴Vulnerability Details

3
OSV
CVE-2025-13019: Same-origin policy bypass in the DOM: Workers component↗2025-11-11
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CVEList
Same-origin policy bypass in the DOM: Workers component↗2025-11-11
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GHSA
GHSA-mv5g-cf64-38cv: Same-origin policy bypass in the DOM: Workers component↗2025-11-11
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📋Vendor Advisories

7
Ubuntu
Thunderbird vulnerabilities↗2026-02-02
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Red Hat
firefox: thunderbird: Same-origin policy bypass in the DOM: Workers component↗2025-11-11
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Debian
CVE-2025-13019: firefox - Same-origin policy bypass in the DOM: Workers component. This vulnerability affe...↗2025
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Mozilla
Mozilla Foundation Security Advisory 2025-91: CVE-2025-13019↗
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Mozilla
Mozilla Foundation Security Advisory 2025-88: CVE-2025-13019↗
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CVE-2025-13019 — Mozilla Firefox vulnerability | cvebase