What is the CVSS score of CVE-2026-23845?

CVE-2026-23845 has a CVSS 3.1 base score of 5.8 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N. EPSS exploitation probability: 0.1%.

Which versions of Mailpit are affected by CVE-2026-23845?

Organizations using Mailpit should be aware of moderate risk from CVE-2026-23845, a server-side request forgery vulnerability rated CVSS 5.8.. A patch is available.

Is there a public PoC exploit available for CVE-2026-23845?

Yes, a public proof-of-concept exploit is available for CVE-2026-23845. Prioritise patching immediately. EPSS: 0.1%.

Mailpit CVE-2026-23845

MEDIUM

Server-Side Request Forgery (SSRF) (CWE-918)

2026-01-19 security-advisories@github.com

GHSA-6jxm-fv7w-rw5j

SSRF Mailpit Suse

5.8

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.8 MEDIUM

AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

SUSE

MEDIUM

qualitative

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 05, 2026 - 18:35 vuln.today

Public exploit code

Patch released

Feb 05, 2026 - 18:35 nvd

Patch available

CVE Published

Jan 19, 2026 - 19:16 nvd

MEDIUM 5.8

DescriptionGitHub Advisory

Mailpit is an email testing tool and API for developers. Versions prior to 1.28.3 are vulnerable to Server-Side Request Forgery (SSRF) via HTML Check CSS Download. The HTML Check feature (/api/v1/message/{ID}/html-check) is designed to analyze HTML emails for compatibility. During this process, the inlineRemoteCSS() function automatically downloads CSS files from external <link rel="stylesheet" href="..."> tags to inline them for testing. Version 1.28.3 fixes the issue.

AnalysisAI

Mailpit versions before 1.28.3 contain a server-side request forgery vulnerability in the HTML Check feature that allows unauthenticated attackers to trigger arbitrary HTTP requests by crafting malicious CSS links in email messages. The vulnerability exists in the CSS inlining function which automatically downloads external stylesheets without proper validation. …

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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 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.

Recommended ActionAI

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …

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Vendor StatusVendor

SUSE

Severity: Medium

Product	Status
openSUSE Leap 15.6	Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP5	Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP6	Fixed
openSUSE Leap 15.5	Fixed

CVE-2026-23845 vulnerability details – vuln.today

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Mailpit CVE-2026-23845

Severity by source

CVSS VectorGitHub Advisory

Lifecycle Timeline

DescriptionGitHub Advisory

AnalysisAI

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Vulnerability AssessmentAI

Recommended ActionAI

Vendor StatusVendor

SUSE

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External POC / Exploit Code