CVE-2026-75628
MediumCVSS 5.7Exploitation Probability (EPSS)
Low risk20th percentile - higher than 20% of all known CVEs
Summary
In Punk::OAuth2 versions before 0.03 for Perl, an attacker-chosen off-site redirect after login is possible because same_origin_path accepts a backslash or tab in the return parameter. This allows bypassing the origin check and redirecting to an external domain.
Risk Assessment
After login, users may be redirected to an attacker-controlled site, potentially leading to phishing or data theft. The redirect does not carry authorization codes, but the social engineering risk is significant.
Recommendation
Update Punk::OAuth2 to version 0.03 or later. Additionally, strengthen validation of the return parameter to reject backslashes and tabs.
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Original NVD description (English source)
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.