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CVE-2026-27808

Mailpit is Vulnerable to Server-Side Request Forgery (SSRF) via Link Check API

HIGH
8.6
CVSS Score
Published: February 25, 2026 at 11:51 PM UTC
Updated: June 17, 2026 at 10:27 AM UTC
1 product affected across 1 vendorMailpit

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Severity
HIGH8.6
Exploit prediction
EPSS 0.5%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mailpit· Axllent
95%
v < 1.29.2
Affected range stops below 1.29.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_CONFIRMExploitVendor Advisory
Source: cverecord
https://github.com/axllent/mailpit/security/advisories/GHSA-mpf7-p9x7-96r3
x_refsource_MISCPatch
Source: cverecord
https://github.com/axllent/mailpit/commit/10ad4df8cc0cd9e51dea1b4410009545eef7fbf5
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/axllent/mailpit/releases/tag/v1.29.2

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.6HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-918

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