Vulnerability · Published Aug 31, 2026 · Assigned by GitHub_M

CVE-2026-77351Wallos: SSRF via Unvalidated User-Level SMTP Host in Email Notification Settings

Low 3.5

In plain English

A low-severity server-side request forgery in Wallos from ellite. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)3.5Low

Exploit odds (30 days)0.3%top 78.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 5.0.0, Wallos lets any authenticated user store an arbitrary SMTP host — including private and cloud-metadata IP addresses — in their personal email notification settings, with no server-side SSRF validation. When the scheduled notification cron job runs, it passes the stored host directly to PHPMailer, causing the Wallos server to open an outbound TCP connection to whatever address the attacker specified. This gives a low-privileged attacker a reliable mechanism to probe internal network services from the server's perspective. This issue has been patched in version 5.0.0.

Affected products (as reported)

Vendor	Product	Versions
ellite	Wallos	< 5.0.0

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N

References

https://github.com/ellite/Wallos/security/advisories/GHSA-mwqv-gv8x-9jcp x_refsource_CONFIRM
https://github.com/ellite/Wallos/commit/11eaf402e841a628c68a805694227ce66c45f6f3 x_refsource_MISC
https://github.com/ellite/Wallos/releases/tag/v5.0.0 x_refsource_MISC