CVE-2026-105829— League CommonMark 1.3.0 before 2.10.2 Stored XSS via DisallowedRawHtml Bypass
Quick assessment
Affected
thephpleague commonmark
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
League CommonMark 版本从 1.3.0 到 2.10.2（不含 2.10.2）存在跨站脚本（XSS）漏洞。攻击者可通过在 Markdown 内容末尾使用裸体的被禁用标签名来闭合原始 HTML，从而绕过 DisallowedRawHtml 扩展的安全限制。具体而言，攻击者可以在输入中放置孤立的 或 标签，随后附加一个提供 或 等属性的块级内容，使得在默认启用 GitHub Flavored Markdown（GFM）设置的场景下，受害者的浏览器中会执行存储型脚本攻击。
Possible ATT&CK Techniques 1 AI
T1189 · Drive-by Compromise
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-105829
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
League CommonMark 1.3.0 before 2.10.2 Stored XSS via DisallowedRawHtml Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
League CommonMark from 1.3.0 before 2.10.2 contains a cross-site scripting vulnerability that allows users posting Markdown to bypass the DisallowedRawHtml extension by ending raw HTML with a bare disallowed tag name. Attackers can place a lone <script or <iframe line followed by a block supplying attributes like src or onload, executing stored scripts in viewers' browsers under default GFM settings.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
Web页面中脚本相关HTML标签转义处理不恰当(基本跨站脚本)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| thephpleague | commonmark | - | - |
|
II. Public POCs for CVE-2026-105829
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-105829
请登录查看更多情报信息。
Other References for CVE-2026-105829 (2)
IV. Related Vulnerabilities
Same product: commonmark
-
CVE-2026-105830
league/commonmark 2.0.0 before 2.10.2 Quadratic DoS via Tabl -
CVE-2024-58382
league/commonmark before 2.6.0 Denial of Service via Quadrat -
CVE-2026-86435
commonmark 1.5.0 before 2.8.4 Denial of Service via Footnote -
CVE-2026-86434
commonmark 2.0.0 through 2.8.3 Denial of Service via Slug Co -
CVE-2026-86433
commonmark 1.5.0 before 2.8.4 Denial of Service via Attribut
Same vendor: thephpleague
-
CVE-2026-105830
league/commonmark 2.0.0 before 2.10.2 Quadratic DoS via Tabl -
CVE-2026-102601
Flysystem: WhitespacePathNormalizer's control-character (Cor -
CVE-2024-58382
league/commonmark before 2.6.0 Denial of Service via Quadrat -
CVE-2026-86435
commonmark 1.5.0 before 2.8.4 Denial of Service via Footnote -
CVE-2026-86433
commonmark 1.5.0 before 2.8.4 Denial of Service via Attribut
Same weakness: CWE-80
-
CVE-2026-89290
HTML Injection in İzometri Informatics' eimzamip -
CVE-2026-103585
attacker-controlled javascript license URL via XSS -
CVE-2026-103584
attacker-controlled javascript license URL via XSS -
CVE-2026-103439
Various rawParams() and escaped() updates to prevent XSS in -
CVE-2026-103438
Various rawParams() and escaped() updates to prevent XSS in
V. Comments for CVE-2026-105829
No comments yet