CVE-2025-62168
Squid vulnerable to information disclosure via authentication credential leakage in error handling
Squid is a caching proxy for the Web. In Squid versions prior to 7.2, a failure to redact HTTP authentication credentials in error handling allows information disclosure. The vulnerability allows a script to bypass browser security protections and learn the credentials a trusted client uses to authenticate. This potentially allows a remote client to identify security tokens or credentials used internally by a web application using Squid for backend load balancing. These attacks do not require Squid to be configured with HTTP authentication. The vulnerability is fixed in version 7.2. As a workaround, disable debug information in administrator mailto links generated by Squid by configuring squid.conf with email_err_data off.
- Affected
- squid-cache · squid
- CVSS v3.1 NVD
- 7.5 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS v3.1 GITHUB
- 10.0 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N - EPSS
- 63.36% chance of exploitation in the next 30 days, 99th percentile
- Nuclei
- critical · CWE-209
- Published
- 2025-10-17
- Updated
- 2026-02-26
Proof-of-concept exploits (3)
- monzaviman/CVE-2025-6216816★ · 2025-10-22
- nehkark/CVE-2025-621680★ · 2025-11-25
- shahroodcert/CVE-2025-621681★ · 2025-11-02
Nuclei templates (1)
Security advisories
- squid-cache/squid/security/advisories/GHSA-c8cc-phh7-xmxr
- squid-cache/squid/commit/0951a0681011dfca3d78c84fd7f1e19c78a4443f