CVE-2025-62508: Starcitizentools/citizen skin Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-g955-vw6w-v6pp
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CVSS 6.5
CWE-79
Published
Advisory Summary

CVE-2025-62508 is a MODERATE (CVSS 6.5) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Starcitizentools/citizen skin libraries in the Packagist ecosystem. The issue involves citizen vulnerable to stored xss in sticky header button messages. Remediation is available by upgrading affected packages to version 3.9.0.

CVE-2025-62508 at a Glance

CVE Identifier CVE-2025-62508
GHSA Identifier GHSA-g955-vw6w-v6pp
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Starcitizentools/citizen skin
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2025-62508

To remediate this vulnerability, upgrade all affected Starcitizentools/citizen skin dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

starcitizentools/citizen-skin fixed: 3.9.0 
Upgrade starcitizentools/citizen-skin to 3.9.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for starcitizentools/citizen-skin

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-62508, inspect your project dependencies for Starcitizentools/citizen skin:

inspect dependencies for starcitizentools/citizen-skin

Analyze the terminal output to locate any version of Starcitizentools/citizen skin in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.9.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Starcitizentools/citizen skin, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary The JS implementation for copying button labels to the sticky header in the Citizen skin unescapes HTML characters, allowing for stored XSS through system messages. ### Details In the `copyButtonAttributes` function in `stickyHeader.js`, when copying the button labels, the `innerHTML` of the new element is set to the `textContent` of the old element: https://github.com/StarCitizenTools/mediawiki-skins-Citizen/blob/f4cbcecf5aca0ae69966b23d4983f9cb5033f319/resources/skins.citizen.scripts/stickyHeader.js#L29-L41 This unescapes any escaped HTML characters and causes the contents of the system messages to be interpreted as HTML. ### PoC 1. Edit any of the affected messages (`citizen-share`, `citizen-view-history`, `citizen-view-edit`, `nstab-talk`) to the following payload: `<img src="" onerror="alert('Sticky Header Button XSS')">`. 2. Visit any mainpage article in the wiki using the Citizen skin. <img width="495" height="228" alt="image" src="https://github.com/user-attachments/assets/ac75b8e1-b181-4335-9526-17d6b6f8518e" /> <img width="569" height="157" alt="image" src="https://github.com/user-attachments/assets/c052edb9-ff68-4869-9c66-3ec85e7ff68a" /> ### Impact This impacts wikis where a group has the `editinterface` but not the `editsitejs` user right. By default, this is the case for the `sysop` group.

CVE-2025-62508 Affected Starcitizentools/citizen skin Versions

1 component(s)
Fixed Versions:
3.9.0
Product / Package Ecosystem Affected Versions Fixed Version
starcitizentools/citizen-skin
 Packagist
≥ 3.3.0
< 3.9.0
3.9.0

References

NVD — CVE-2025-62508 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-62508
GitHub Advisory / Wiki ADVISORY
https://github.com/StarCitizenTools/mediawiki-skins-Citizen/security/advisories/GHSA-g955-vw6w-v6pp
Security Fix Commit FIX COMMIT
https://github.com/StarCitizenTools/mediawiki-skins-Citizen/commit/e006923c6dbf113c9a025ca186ecc09fe7b93a15
Security Fix Commit FIX COMMIT
https://github.com/StarCitizenTools/mediawiki-skins-Citizen/commit/fbb1d4fe9627281567706f3f6fc99a42ce16fdc4
Starcitizentools/citizen skin Source Repository REPOSITORY
https://github.com/StarCitizenTools/mediawiki-skins-Citizen

Frequently Asked Questions

What is CVE-2025-62508?
CVE-2025-62508 is a security vulnerability in Starcitizentools/citizen skin involving Citizen vulnerable to stored XSS in sticky header button messages under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Starcitizentools/citizen skin versions are affected?
Affected versions include releases prior to 3.9.0 across affected packages: starcitizentools/citizen-skin.
What version fixes CVE-2025-62508?
Upgrading to 3.9.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is starcitizentools/citizen-skin affected?
Yes, starcitizentools/citizen-skin is affected in releases prior to 3.9.0. Upgrade your dependency to 3.9.0 or later.
What is the CVSS score of CVE-2025-62508?
CVE-2025-62508 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2025-62508?
CVE-2025-62508 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Packagist dependencies for CVE-2025-62508?
Run the dependency tree command: 'inspect dependencies for starcitizentools/citizen-skin'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-g955-vw6w-v6pp",
  "modified" : "2025-10-20T15:31:06Z",
  "published" : "2025-10-20T15:31:06Z",
  "aliases" : [ "CVE-2025-62508" ],
  "summary" : "Citizen vulnerable to stored XSS in sticky header button messages",
  "details" : "### Summary\nThe JS implementation for copying button labels to the sticky header in the Citizen skin unescapes HTML characters, allowing for stored XSS through system messages.\n\n### Details\nIn the `copyButtonAttributes` function in `stickyHeader.js`, when copying the button labels, the `innerHTML` of the new element is set to the `textContent` of the old element:\nhttps://github.com/StarCitizenTools/mediawiki-skins-Citizen/blob/f4cbcecf5aca0ae69966b23d4983f9cb5033f319/resources/skins.citizen.scripts/stickyHeader.js#L29-L41\nThis unescapes any escaped HTML characters and causes the contents of the system messages to be interpreted as HTML.\n\n### PoC\n1. Edit any of the affected messages (`citizen-share`, `citizen-view-history`, `citizen-view-edit`, `nstab-talk`) to the following payload: `<img src=\"\" onerror=\"alert('Sticky Header Button XSS')\">`.\n2. Visit any mainpage article in the wiki using the Citizen skin.\n\n<img width=\"495\" height=\"228\" alt=\"image\" src=\"https://github.com/user-attachments/assets/ac75b8e1-b181-4335-9526-17d6b6f8518e\" />\n<img width=\"569\" height=\"157\" alt=\"image\" src=\"https://github.com/user-attachments/assets/c052edb9-ff68-4869-9c66-3ec85e7ff68a\" />\n\n\n### Impact\nThis impacts wikis where a group has the `editinterface` but not the `editsitejs` user right. By default, this is the case for the `sysop` group.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "starcitizentools/citizen-skin"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.3.0"
      }, {
        "fixed" : "3.9.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/StarCitizenTools/mediawiki-skins-Citizen/security/advisories/GHSA-g955-vw6w-v6pp"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-62508"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/StarCitizenTools/mediawiki-skins-Citizen/commit/e006923c6dbf113c9a025ca186ecc09fe7b93a15"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/StarCitizenTools/mediawiki-skins-Citizen/commit/fbb1d4fe9627281567706f3f6fc99a42ce16fdc4"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/StarCitizenTools/mediawiki-skins-Citizen"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-10-20T15:31:06Z",
    "nvd_published_at" : "2025-10-17T21:15:36Z"
  }
}