Description

Due to insufficient escaping of the ampersand character in the “Copy as cURL” feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system.
*This bug only affects Firefox for Windows. Other versions of Firefox are unaffected.* This vulnerability affects Firefox < 139, Firefox ESR < 115.24, and Firefox ESR < 128.11.

Classification

CVE ID: CVE-2025-5265

CVSS Base Severity: MEDIUM

CVSS Base Score: 4.8

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

Affected Products

Vendor: Mozilla

Product: Firefox, Firefox ESR

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.02% (probability of being exploited)

EPSS Percentile: 1.79% (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-2025-5265
https://bugzilla.mozilla.org/show_bug.cgi?id=1962301
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