What’s Vulnerable › Vulnerabilities

CVE-2025-13019: Same-origin policy bypass in the DOM: Workers component

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-11-11 · updated 2026-10-23
• Weakness: CWE-942

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.

Affected products

• Mozilla Firefox: before 140.5.0; before 145.0 — fixed in 140.5.0, 145.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 140.5.0, 145.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1988412
• https://www.mozilla.org/security/advisories/mfsa2025-87/
• https://www.mozilla.org/security/advisories/mfsa2025-88/
• https://www.mozilla.org/security/advisories/mfsa2025-90/
• https://www.mozilla.org/security/advisories/mfsa2025-91/

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