要点
- CVE-2025-61676 は october/system, october (octobercms) に影響する深刻度「中」 (CVSS 4.8) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：0.27%（全脆弱性の 19.8% より高い）。
- 対処：4.0.12, 3.7.13 以降に更新してください。
| パッケージ | 影響を受けるバージョン | 修正済みバージョン |
|---|
| october/system Packagist | ≥ 4.0.0, < 4.0.12< 3.7.13
| 4.0.123.7.13
|
| october | ≥ 4.0.0, < 4.0.12< 3.7.13
| 4.0.123.7.13
|
概要
A cross-site scripting (XSS) vulnerabilities was identified in October CMS backend configuration forms:
- Branding and Appearances Styles
A user with the Customize Backend Styles permission could inject malicious HTML/JS into the stylesheet input at
Settings → Branding & Appearance → Styles.
A specially crafted input could break out of the intended <style> context, allowing arbitrary script execution across backend pages for all users.
Impact
- Persistent XSS across the backend interface.
- Exploitable by lower-privileged accounts with the above permissions.
- Potential consequences include privilege escalation, session hijacking, and execution of unauthorized actions in victim sessions.
Patches
The vulnerability has been patched in v4.0.12 and v3.7.13.
Stylesheet inputs are now sanitized to prevent injection of arbitrary HTML/JS.
All users are strongly encouraged to upgrade to the latest patched version.
Workarounds
If upgrading immediately is not possible:
- Restrict the permissions
Customize Backend Styles to fully trusted administrators only.
This reduces exposure but does not fully eliminate risk.
Credits
NVD の説明
October is a Content Management System (CMS) and web platform. Prior to versions 3.7.13 and 4.0.12, a cross-site scripting (XSS) vulnerabilities was identified in October CMS backend configuration forms. A user with the Customize Backend Styles permission could inject malicious HTML/JS into the stylesheet input at Styles from Branding & Appearance settings. A specially crafted input could break out of the intended <style> context, allowing arbitrary script execution across backend pages for all users. This issue has been patched in versions 3.7.13 and 4.0.12.
これらの製品をお使いですか？サイトをスキャンして、脆弱なバージョンが公開されていないか確認しましょう。
無料でサイトをスキャン