Content Injection Vulnerability in Firefox by Mozilla
CVE-2025-5271

6.5MEDIUM

Key Information:

Vendor

Mozilla
Status
Firefox
Vendor
CVE Published:
27 May 2025

What is CVE-2025-5271?

A vulnerability exists in older versions of Firefox where the Developer Tools fail to honor Content Security Policy (CSP) headers during response previews. This oversight may lead to the potential for content injection attacks, allowing malicious actors to execute unauthorized scripts or manipulate content. Affected users should update to the latest version of Firefox to mitigate these risks.

Affected Version(s)

Firefox < 139

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1920348
https://www.mozilla.org/security/advisories/mfsa2025-42/

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Satoki Tsuji
.
The Cyber Security Vulnerability Database.