CVE-2026-77352 Wallos: Authenticated SSRF via per-user SMTP notification host (low-privilege user)
Authenticated users can trigger server-side requests to internal networks via SMTP settings, potentially exposing internal services.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77352?
CVE-2026-77352 is a medium-severity server-side request forgery vulnerability in ellite Wallos, published on 31 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Wallos is an open-source, self-hostable personal subscription tracker. From version 2.0.0 to before version 5.0.0, any authenticated Wallos user (no admin rights required) can make the server open arbitrary outbound SMTP connections to internal/link-local addresses, by setting the SMTP host of their personal email notifications to an internal IP. The per-user notification settings endpoint (endpoints/notifications/saveemailnotifications.php) performs no SSRF validation, and the notification cron (endpoints/cronjobs/sendnotifications.php) feeds that user-controlled host straight into PHPMailer ($mail->Host = $email['smtpAddress']). When the user's subscription notification fires, the server connects to the chosen host:port. This issue has been patched in version 5.0.0.
Weakness: CWE-918
Which versions are affected by CVE-2026-77352?
How do I fix CVE-2026-77352?
No fix has been published for CVE-2026-77352 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-77352 being exploited?
There is no known exploitation of CVE-2026-77352 in the wild and no public exploit code.
Sources
Also known as GHSA-c75x-9vj6-57qj.