CVE-2026-27808
Mailpit is Vulnerable to Server-Side Request Forgery (SSRF) via Link Check API
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.
INFO
Published Date :
Feb. 26, 2026, 12:16 a.m.
Last Modified :
Feb. 28, 2026, 1 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Mailpit to version 1.29.2.
- Apply updates for Mailpit.
- Restrict API access if possible.
- Monitor network traffic for suspicious requests.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-27808.
| URL | Resource |
|---|---|
| https://github.com/axllent/mailpit/commit/10ad4df8cc0cd9e51dea1b4410009545eef7fbf5 | Patch |
| https://github.com/axllent/mailpit/releases/tag/v1.29.2 | Release Notes |
| https://github.com/axllent/mailpit/security/advisories/GHSA-mpf7-p9x7-96r3 | Exploit Vendor Advisory |
| https://github.com/axllent/mailpit/security/advisories/GHSA-mpf7-p9x7-96r3 | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-27808 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-27808
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-27808 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-27808 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 28, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N Added CPE Configuration OR *cpe:2.3:a:axllent:mailpit:*:*:*:*:*:*:*:* versions up to (excluding) 1.29.2 Added Reference Type GitHub, Inc.: https://github.com/axllent/mailpit/commit/10ad4df8cc0cd9e51dea1b4410009545eef7fbf5 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/axllent/mailpit/releases/tag/v1.29.2 Types: Release Notes Added Reference Type CISA-ADP: https://github.com/axllent/mailpit/security/advisories/GHSA-mpf7-p9x7-96r3 Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/axllent/mailpit/security/advisories/GHSA-mpf7-p9x7-96r3 Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Feb. 26, 2026
Action Type Old Value New Value Added Reference https://github.com/axllent/mailpit/security/advisories/GHSA-mpf7-p9x7-96r3 -
New CVE Received by [email protected]
Feb. 26, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N Added CWE CWE-918 Added Reference https://github.com/axllent/mailpit/commit/10ad4df8cc0cd9e51dea1b4410009545eef7fbf5 Added Reference https://github.com/axllent/mailpit/releases/tag/v1.29.2 Added Reference https://github.com/axllent/mailpit/security/advisories/GHSA-mpf7-p9x7-96r3