How severe is CVE-2025-49577?

CVE-2025-49577 has a CVSS score of 6.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2025-49577?

CVE-2025-49577 affects the following packages: starcitizentools/citizen-skin (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2025-49577?

Update starcitizentools/citizen-skin to 3.3.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-49577 is resolved across your whole dependency graph.

How do I detect CVE-2025-49577 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for starcitizentools/citizen-skin, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2025-49577 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2025-49577 actively exploited in the wild?

No public exploit code has been indexed for CVE-2025-49577 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2025-49577?

CVE-2025-49577 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 37th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2025-49577?

CVE-2025-49577 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2025-49577 published, and has it been updated?

CVE-2025-49577 was published on June 12, 2025 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

MEDIUM severity

CVE-2025-49577 — citizen-skin

MEDIUMFix: StarCitizenTools/mediawiki-skins-Citizen@93c36ac

CVE-2025-49577 is a medium-severity (CVSS 6.5) Cross-site Scripting (XSS) vulnerability in starcitizentools/citizen-skin. A fix is available for starcitizentools/citizen-skin — see the affected versions and patch details below.

Citizen allows stored XSS in preference menu headings

Also known asGHSA-jwr7-992g-68mh

Published

Jun 12, 2025

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-49577.

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs37th percentile — riskier than 37% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐘starcitizentools/citizen-skin

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Summary

Various preferences messages are inserted into raw HTML, allowing anybody who can edit those messages to insert arbitrary HTML into the DOM.

Details

The innerHtml of the label div is set to the textContent of the label, essentially unsanitizing the system messages: https://github.com/StarCitizenTools/mediawiki-skins-Citizen/blob/407052e7069bdeae927d6f1a2a1c9a45b473bf9a/resources/skins.citizen.preferences/addPortlet.polyfill.js#L18

PoC

Edit citizen-feature-custom-font-size-name (or any other message displayed in a heading in the preferences menu) to <img src="" onerror="alert('citizen-feature-custom-font-size-name')"> (script tags don't work here due to the way the HTML is inserted)
Open the preferences menu

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`starcitizentools/citizen-skin`	≥ 2.13.0&&< 3.3.1	3.3.1`composer require starcitizentools/citizen-skin:^3.3.1`

Affected Products

1 product · 1 configurations

Application

citizenstarcitizen.tools

< 3.3.1

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for starcitizentools/citizen-skin, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update starcitizentools/citizen-skin to 3.3.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-49577 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Summary Various preferences messages are inserted into raw HTML, allowing anybody who can edit those messages to insert arbitrary HTML into the DOM. ### Details The `innerHtml` of the label div is set to the `textContent` of the label, essentially unsanitizing the system messages: https://github.com/StarCitizenTools/mediawiki-skins-Citizen/blob/407052e7069bdeae927d6f1a2a1c9a45b473bf9a/resources/skins.citizen.preferences/addPortlet.polyfill.js#L18 ### PoC 1. Edit `citizen-feature-custom-font-size-name` (or any other message displayed in a heading in the preferences menu) to `<img src=""

O3 Security · Impact-Aware SCA

Is CVE-2025-49577 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.5/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Raw vector

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

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

Timeline

Disclosed

Jun 12, 2025

Last updated

Oct 28, 2026

Identifiers

CVE-2025-49577

GHSA-jwr7-992g-68mh

References

Advisorygithub.com · CVE 2025 49577.json Advisorygithub.com · GHSA jwr7 992g 68mh Advisorynvd.nist.gov · CVE 2025 49577 Fixgithub.com · 93c36ac778397e0e7c46cf7adb1e5d848265f1bd Fixgithub.com · a741639085d70c22a9f49890542a142a223bf981 Packagegithub.com · mediawiki skins Citizen

Related vulnerabilities

This CVE is medium severity; 8 of 8 other CVEs affecting starcitizentools/citizen-skin are rated as high or higher (top: high).

CVE-2025-62508CVE-2025-53370CVE-2025-53368CVE-2025-49578CVE-2025-49576CVE-2025-49579CVE-2025-49575CVE-2024-47536

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 28, 2026

CVE-2025-49577 — citizen-skin

Exploitation Status

Proof-of-concept exploit code exists

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Summary

Details

PoC

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is CVE-2025-49577 in your dependencies?