CVE-2025-11713: firefox Improper Encoding — Fix

Description

Insufficient escaping in the “Copy as cURL” feature could have been used to trick a user into executing unexpected code on Windows. This did not affect the application when running on other operating systems. This vulnerability was fixed in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.

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CVSS v3.1 Score

8.1

HIGH

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

Weakness Type (CWE)

CWE-116 CWE-116

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 140.4.0
mozilla	firefox	< 144.0
mozilla	thunderbird	< 140.4.0
mozilla	thunderbird	141.0 — 144.0

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2025-81/ https://www.mozilla.org/security/advisories/mfsa2025-83/ https://www.mozilla.org/security/advisories/mfsa2025-84/ https://www.mozilla.org/security/advisories/mfsa2025-85/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=1986142

Frequently Asked Questions

What is CVE-2025-11713? +

Insufficient escaping in the “Copy as cURL” feature could have been used to trick a user into executing unexpected code on Windows. This did not affect the application when running on other operating systems. This vulnerability was fixed in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2025-11713? +

CVE-2025-11713 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-11713? +

CVE-2025-11713 affects products from mozilla, specifically: firefox, thunderbird. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-11713? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-11713