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CVE-2025-5263

Published: May 27, 2025

Modified: Apr 13, 2026

PUBLISHED

Description

Error handling for script execution was incorrectly isolated from web content, which could have allowed cross-origin leak attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 115.24, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

Vendor	Product	Versions
Mozilla	Firefox	unaffected `115.24 - <= 115.` unaffected `128.11 - <= 128.` unaffected `139 - <= *`
Mozilla	Thunderbird	unaffected `128.11 - <= 128.` unaffected `139 - <= `

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1960745

https://www.mozilla.org/security/advisories/mfsa2025-42/

https://www.mozilla.org/security/advisories/mfsa2025-43/

https://www.mozilla.org/security/advisories/mfsa2025-44/

https://www.mozilla.org/security/advisories/mfsa2025-45/

https://www.mozilla.org/security/advisories/mfsa2025-46/

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