CVE-2026-75628 Punk::OAuth2 versions before 0.03 for Perl allow an attacker-chosen off-site redirect after login because same_origin_path accepts a backsla
Attackers can redirect users to malicious sites after login due to insufficient validation of the return parameter in Punk::OAuth2.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-75628?
CVE-2026-75628 is a medium-severity vulnerability, published on 20 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-601
Which versions are affected by CVE-2026-75628?
How do I fix CVE-2026-75628?
No fix has been published for CVE-2026-75628 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-75628 being exploited?
There is no known exploitation of CVE-2026-75628 in the wild and no public exploit code.
Sources
Also known as GHSA-v6g5-xxrx-m495.