CVE-2026-77352: CWE-918: Server-Side Request Forgery (SSRF) in ellite Wallos
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.
CVSS v3.1
Score 4.3medium
Affected software
ellite
Wallos
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Wallos versions 2.0.0 through before 5.0.0 allow any authenticated user to specify an arbitrary SMTP host in their personal email notification settings. The endpoint endpoints/notifications/saveemailnotifications.php does not validate the SMTP host, and the notification cron job uses this user-controlled host directly in PHPMailer. This enables SSRF by making the server open outbound SMTP connections to internal or link-local addresses controlled by the user. The issue is fixed in version 5.0.0.
Potential Impact
An attacker with authenticated access can cause the Wallos server to initiate SMTP connections to arbitrary internal or link-local network addresses. This could potentially be used to probe internal network services or bypass network restrictions. The confidentiality impact is limited (CVSS 4.3, low confidentiality impact), with no integrity or availability impact reported.
Mitigation Recommendations
Upgrade Wallos to version 5.0.0 or later, where this SSRF vulnerability has been patched. No other official remediation or temporary fixes are documented. Until upgrading, restrict authenticated user ability to configure SMTP hosts or monitor for suspicious notification configurations if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-20T19:28:35.244Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a95f425acd9273b499e7701
Added to database: 08/31/2026, 21:37:41 UTC
Last enriched: 09/07/2026, 14:50:53 UTC
Last updated: 10/15/2026, 18:48:23 UTC
Views: 84
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