Vulnerability Description
Mailpit is an email testing tool and API for developers. Prior to version 1.29.2, the Link Check API (/api/v1/message/{ID}/link-check) is vulnerable to Server-Side Request Forgery (SSRF). The server performs HTTP HEAD requests to every URL found in an email without validating target hosts or filtering private/internal IP addresses. The response returns status codes and status text per link, making this a non-blind SSRF. In the default configuration (no authentication on SMTP or API), this is fully exploitable remotely with zero user interaction. This is the same class of vulnerability that was fixed in the HTML Check API (CVE-2026-23845 / GHSA-6jxm-fv7w-rw5j) and the screenshot proxy (CVE-2026-21859 / GHSA-8v65-47jx-7mfr), but the Link Check code path was not included in either fix. Version 1.29.2 fixes this vulnerability.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Axllent | Mailpit | < 1.29.2 |
Related Weaknesses (CWE)
References
- https://github.com/axllent/mailpit/commit/10ad4df8cc0cd9e51dea1b4410009545eef7fbPatch
- https://github.com/axllent/mailpit/releases/tag/v1.29.2Release Notes
- https://github.com/axllent/mailpit/security/advisories/GHSA-mpf7-p9x7-96r3ExploitVendor Advisory
- https://github.com/axllent/mailpit/security/advisories/GHSA-mpf7-p9x7-96r3ExploitVendor Advisory
FAQ
What is CVE-2026-27808?
CVE-2026-27808 is a vulnerability with a CVSS score of 5.8 (MEDIUM). Mailpit is an email testing tool and API for developers. Prior to version 1.29.2, the Link Check API (/api/v1/message/{ID}/link-check) is vulnerable to Server-Side Request Forgery (SSRF). The server p...
How severe is CVE-2026-27808?
CVE-2026-27808 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-27808?
Check the references section above for vendor advisories and patch information. Affected products include: Axllent Mailpit.