Punk::OAuth2 versions before 0.03 for Perl allow an attacker-chosen off-site redirect after login because same_origin_path accepts a backslash or tab in the return parameter.
oauth2_login reads the return parameter from the initiation request, runs same_origin_path over it, and stores the survivor in the session flow record as the post-login redirect target. That check rejects a value that does not begin with a slash, one with a slash as its second byte, and one containing CR or LF. A backslash and a tab pass. The URL Standard treats a backslash as equivalent to a slash for special schemes, so `/\evil.example` parses with the authority `evil.example`. It also strips ASCII tab before parsing, so a tab between two leading slashes leaves `//evil.example`.
A crafted link to the application's own login route lands the victim on the attacker's site after a genuine authentication. The redirect carries no authorization code or access token.
References
Configurations
No configuration.
History
No history.
Information
Published : 2026-08-20 01:16
Updated : 2026-08-28 16:18
NVD link : CVE-2026-75628
Mitre link : CVE-2026-75628
CVE.ORG link : CVE-2026-75628
JSON object : View
Products Affected
No product.
CWE
CWE-601
URL Redirection to Untrusted Site ('Open Redirect')