CVE-2025-5271CWE-116

CVE-2025-5271

Medium · published May 27, 2025

CVSS v3.1
6.5
EPSS
0%
Percentile
22.0
In the wild
Unconfirmed
What it is

Previewing a response in Devtools ignored CSP headers, which could have allowed content injection attacks. This vulnerability was fixed in Firefox 139 and Thunderbird 139.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00305 · 22.0th percentile
Weakness
CWE-116 · Improper Encoding or Escaping of Output
Published
2025-05-27T17:15Z
Affected products (1)
ProductVersionsFixed in
mozilla/firefox< 139.0139.0
References (3)
https://bugzilla.mozilla.org/show_bug.cgi?id=1920348 · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-42/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-45/ · [email protected]
EPSS history
Timeline
  • 27 MAY 12:29Z
    Devtools' preview ignored CSP headers
    cvelistv5