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CVE-2025-5263: Error handling for script execution was incorrectly isolated from web content, which could have allowed cross-origin leak attacks. This...

4.3 CVSS

Description

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

Classification

CVE ID: CVE-2025-5263

CVSS Base Severity: MEDIUM

CVSS Base Score: 4.3

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Problem Types

Error handling for script execution was incorrectly isolated from web content

Affected Products

Vendor: Mozilla

Product: Firefox, Firefox ESR

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.03% (probability of being exploited)

EPSS Percentile: 7.46% (scored less or equal to compared to others)

EPSS Date: 2025-06-18 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-5263
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/

Timeline