CVE-2025-61676: October/system Cross-Site Scripting Vulnerability
MODERATECVE-2025-61676 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting October/system libraries in the Packagist ecosystem. The issue involves october cms vulnerable to stored xss via branding styles. Remediation is available by upgrading affected packages to version 3.7.13, 4.0.12.
CVE-2025-61676 at a Glance
Security Impact
CVSS: 6.1
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:R/S:U/C:H/I:H/A:N).
How to Fix CVE-2025-61676
To remediate this vulnerability, upgrade all affected October/system dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade october/system to 3.7.13Upgrade october/system to 4.0.12Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for october/systemHow to Check if You Are Affected
To determine whether your application is affected by CVE-2025-61676, inspect your project dependencies for October/system:
inspect dependencies for october/systemAnalyze the terminal output to locate any version of October/system in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.7.13), 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 October/system, 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
CVE-2025-61676 Affected October/system Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
october/system
|
Packagist |
< 3.7.13
|
3.7.13
|
|
october/system
|
Packagist |
≥ 4.0.0
< 4.0.12
|
4.0.12
|
References
Frequently Asked Questions
What is CVE-2025-61676?
Which October/system versions are affected?
What version fixes CVE-2025-61676?
Is october/system affected?
What is the CVSS score of CVE-2025-61676?
What CWE is associated with CVE-2025-61676?
How can I check Packagist dependencies for CVE-2025-61676?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-wvpq-h33f-8rp6",
"modified" : "2026-01-11T14:55:37Z",
"published" : "2026-01-09T20:12:24Z",
"aliases" : [ "CVE-2025-61676" ],
"summary" : "October CMS Vulnerable to Stored XSS via Branding Styles",
"details" : "A cross-site scripting (XSS) vulnerabilities was identified in October CMS backend configuration forms:\n\n- **Branding and Appearances Styles** \n A user with the `Customize Backend Styles` permission could inject malicious HTML/JS into the stylesheet input at \n *Settings → Branding & Appearance → Styles*. \n\nA specially crafted input could break out of the intended `<style>` context, allowing arbitrary script execution across backend pages for all users.\n\n---\n\n### Impact\n- Persistent XSS across the backend interface. \n- Exploitable by lower-privileged accounts with the above permissions. \n- Potential consequences include privilege escalation, session hijacking, and execution of unauthorized actions in victim sessions.\n\n---\n\n### Patches\nThe vulnerability has been patched in **v4.0.12** and **v3.7.13**. \nStylesheet inputs are now sanitized to prevent injection of arbitrary HTML/JS. \n\nAll users are strongly encouraged to upgrade to the latest patched version.\n\n---\n\n### Workarounds\nIf upgrading immediately is not possible: \n- Restrict the permissions `Customize Backend Styles` to fully trusted administrators only. \n\nThis reduces exposure but does not fully eliminate risk.\n\n---\n\n### Credits\n- Reported by **[Nakkouch Tarek](https://github.com/nakkouchtarek)**",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Packagist",
"name" : "october/system"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "3.7.13"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 3.7.12"
}
}, {
"package" : {
"ecosystem" : "Packagist",
"name" : "october/system"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "4.0.0"
}, {
"fixed" : "4.0.12"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 4.0.11"
}
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/octobercms/october/security/advisories/GHSA-wvpq-h33f-8rp6"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-61676"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/octobercms/october"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-79" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-01-09T20:12:24Z",
"nvd_published_at" : "2026-01-10T04:16:00Z"
}
}