What is CVE-2025-11713?

CVE-2025-11713 is a high-severity vulnerability in Mozilla Firefox, classified under Improper Encoding or Escaping of Output. CVSS score: 8.1/10. Published 2025-10-14.

How severe is CVE-2025-11713?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Mozilla Firefox

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.

Published 2025-10-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (27.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000

Affected products

Mozilla Firefox — versions 140.4, 144
Mozilla Thunderbird — versions 140.4, 144

Weakness classification (CWE)

CWE-116 — Improper Encoding or Escaping of Output

References

bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
www.mozilla.org/security/advisories/mfsa2025-81/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2025-83/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2025-84/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2025-85/ (Vendor Advisory)

Frequently asked questions

What is CVE-2025-11713?: CVE-2025-11713 is a high-severity vulnerability in Mozilla Firefox, classified under Improper Encoding or Escaping of Output. CVSS score: 8.1/10. Published 2025-10-14.
How severe is CVE-2025-11713?: High severity. CVSS v3 base score is 8.1 out of 10.