CVE-2025-62168 PoC — Squid vulnerable to information disclosure via authentication credential leakage in error handling

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-62168.yaml

Associated Vulnerability

Title:Squid vulnerable to information disclosure via authentication credential leakage in error handling (CVE-2025-62168)
Description: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.

Description

Squid versions prior to 7.2 fail to redact HTTP authentication credentials in error page responses. The Authorization header value is embedded in plain text inside the mailto: diagnostic block when Squid generates an error page (e.g. ERR_DNS_FAIL).

File Snapshot

Remarks

1. It is advised to access via the original source first.

2. Local POC snapshots are reserved for subscribers — if the original source is unavailable, the local mirror is part of the paid plan.

View subscription plans →