What is the CVSS score of CVE-2026-21432?

CVE-2026-21432 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Emlog are affected by CVE-2026-21432?

Organizations using Emlog should be aware of moderate risk from CVE-2026-21432, a cross-site scripting vulnerability rated CVSS 5.4.

Is there a public PoC exploit available for CVE-2026-21432?

Yes, a public proof-of-concept exploit is available for CVE-2026-21432. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-21432?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Emlog CVE-2026-21432

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-01-02 security-advisories@github.com

XSS Emlog

5.4

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.4 MEDIUM

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 16, 2026 - 17:13 vuln.today

Public exploit code

CVE Published

Jan 02, 2026 - 19:15 nvd

MEDIUM 5.4

DescriptionGitHub Advisory

Emlog is an open source website building system. Version 2.5.23 has a stored cross-site scripting vulnerability that can lead to account takeover, including takeover of admin accounts. As of time of publication, no known patched versions are available.

AnalysisAI

Stored XSS in Emlog 2.5.23 allows authenticated attackers to inject malicious scripts that execute in other users' browsers, potentially leading to administrative account compromise. Public exploit code exists for this vulnerability, and no patched version is currently available. …

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Vulnerability AssessmentAI

Risk Assessment	CVSS 5.4 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker (requires authentication) could exploit this vulnerability to account takeover, including takeover of admin accounts.
Remediation	Monitor vendor advisories for a patch. … 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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CVE-2026-21432 vulnerability details – vuln.today

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