What is the CVSS score of CVE-2025-49578?

CVE-2025-49578 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.1%.

Which versions of Citizen are affected by CVE-2025-49578?

Organizations using Citizen should be aware of notable risk from CVE-2025-49578, a cross-site scripting vulnerability rated CVSS 6.5.. A patch is available.

Is there a public PoC exploit available for CVE-2025-49578?

Yes, a public proof-of-concept exploit is available for CVE-2025-49578. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-49578?

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

Citizen CVE-2025-49578

EUVD-2025-18205 MEDIUM

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

2025-06-12 security-advisories@github.com

GHSA-2v3v-3whp-953h

XSS Citizen Starcitizen Tools

6.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.5 MEDIUM

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

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

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

EUVD ID Assigned

Mar 14, 2026 - 21:20 euvd

EUVD-2025-18205

Analysis Generated

Mar 14, 2026 - 21:20 vuln.today

Patch released

Mar 14, 2026 - 21:20 nvd

Patch available

PoC Detected

Aug 22, 2025 - 18:48 vuln.today

Public exploit code

CVE Published

Jun 12, 2025 - 19:15 nvd

MEDIUM 6.5

DescriptionGitHub Advisory

Citizen is a MediaWiki skin that makes extensions part of the cohesive experience. Various date messages returned by Language::userDate are inserted into raw HTML, allowing anybody who can edit those messages to insert arbitrary HTML into the DOM. This impacts wikis where a group has the editinterface but not the editsitejs user right. This vulnerability is fixed in 3.3.1.

Analysis

Technical ContextAI

Cross-site scripting (XSS) allows injection of client-side scripts into web pages viewed by other users due to insufficient output encoding.

RemediationAI

A vendor patch is available — apply it immediately. Encode all user-supplied output contextually (HTML, JS, URL). Implement Content Security Policy (CSP) headers. Use HTTPOnly and Secure cookie flags.