Mailpit
CVE-2026-27808
MEDIUM
GHSA-mpf7-p9x7-96r3
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
Mailpit versions prior to 1.29.2 contain a Server-Side Request Forgery vulnerability in the Link Check API that allows unauthenticated remote attackers to perform HTTP requests to arbitrary hosts, including internal and private IP addresses. The API fails to validate or filter target URLs and returns status codes for each link, enabling non-blind SSRF attacks. …
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Vulnerability AssessmentAI
| Risk Assessment | CVSS 5.8 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A remote attacker without authentication could exploit this vulnerability to compromise the affected system. |
| Remediation | A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …
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Vendor StatusVendor
SUSE
Severity: MediumShare
External POC / Exploit Code
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