CVE-2025-5265

Name: CVE-2025-5265
Creator: NVD / NIST
Published: 2025-05-27T13:15:22.303+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.14%

Last modified Jun 17, 2026

CVE-2025-5265 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. 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.*. EPSS estimates a 0.14% chance of exploitation in the next 30 days.

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 was fixed in Firefox 139, Firefox ESR 115.24, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

Metrics

CVSS 3.1

4.8/10

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

EPSS Probability

0.14%

3.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-77

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 115.24.0
Mozilla	Firefox	< 139.0
Mozilla	Firefox	>= 116.0, < 128.11.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1962301Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-42/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-43/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-44/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-45/
https://www.mozilla.org/security/advisories/mfsa2025-46/

Timeline

Published: May 27, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2025-5265?

How severe is CVE-2025-5265?

CVE-2025-5265 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.14% probability of exploitation in the next 30 days.

How do I fix CVE-2025-5265?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-5265?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST