要点
- CVE-2026-61823 は code16/sharp に影響する深刻度「高」 (CVSS 7.3) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：0.21%（全脆弱性の 11.3% より高い）。
- 対処：9.22.5 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 |
|---|
| code16/sharp Packagist | < 9.22.5
| 9.22.5
|
概要
Impact
A Stored Cross-Site Scripting (XSS) vulnerability exists in the rich text editor due to improper sanitization of the srcdoc attribute on <iframe> elements.
While the underlying Symfony HtmlSanitizer correctly HTML-encodes special characters inside the attribute value (e.g., converting <script> to <script>), the HTML specification mandates that browsers automatically decode HTML entities inside attribute values before processing them. As a result, any encoded JavaScript inside a srcdoc attribute is evaluated and executed as live HTML/JS in the context of the iframe when the page is rendered.
An attacker with permissions to edit an Editor field can inject malicious scripts to target other users viewing the content. Potential impacts include:
- Session Hijacking (stealing admin session cookies via document.cookie)
- Account Takeover & Privilege Escalation (e.g., a low-privileged editor triggering actions as an Administrator)
- Admin panel data theft
Patches
The vulnerability has been patched in version v9.22.5.
The fix explicitly removes srcdoc from the list of allowed iframe attributes in src/Utils/Sanitization/FormatsSanitizedValue.php.
Workarounds
Users who cannot upgrade immediately can manually sanitize all content of editor fields to strip srcdoc attributes.
NVD の説明
code16 Sharp is a Laravel-based framework for building content-management and administrative interfaces. Versions before 9.22.5 contain a stored cross-site scripting vulnerability in the rich-text editor because the HTML sanitizer permits the `srcdoc` attribute on iframe elements. Although markup inside `srcdoc` is HTML-encoded during sanitization, browsers decode attribute entities before interpreting the iframe document, allowing an authenticated user with permission to edit an Editor field to store executable JavaScript that runs when another user views the content. Successful exploitation can result in session hijacking, unauthorized actions, account takeover, privilege escalation, or disclosure of administrative data. Version 9.22.5 patches the vulnerability by removing `srcdoc` from the permitted iframe attributes. As a workaround, applications that cannot upgrade should manually sanitize all Editor field content and remove every iframe `srcdoc` attribute before storing or rendering it.
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