CVE-2026-50159— Mermaid allows CSS injection applying to sibling elements of the diagram
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-50159
Vulnerability Information
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Vulnerability Title
Mermaid allows CSS injection applying to sibling elements of the diagram
Source: CVE Program / CVE List V5
Vulnerability Description
Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Prior to 10.9.8 and 11.16.1, Mermaid is vulnerable to CSS injection via sibling combinator selectors generated from diagram-supplied class or id names. An attacker who can supply diagram text can inject arbitrary CSS into the rendered page, potentially altering the appearance or behavior of unrelated page elements. This issue is fixed in versions 10.9.8 and 11.16.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| mermaid-js | mermaid | < 10.9.8 | - |
II. Public POCs for CVE-2026-50159
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-50159 (3)
Vendor Advisories for CVE-2026-50159 (1)
Vendor Pages for CVE-2026-50159 (1)
- 🔗 Release mermaid@11.16.1 · mermaid-js/mermaid · GitHubx_refsource_MISC
Other References for CVE-2026-50159 (1)
- 🔗 Release v10.9.8 · mermaid-js/mermaid · GitHubx_refsource_MISC
Same Patch Batch · mermaid-js · 2026-08-06 · 5 CVEs total
| CVE-2026-71437 | 6.5 MEDIUM | Mermaid Architecture diagrams are vulnerable to prototype pollution |
| CVE-2026-71439 | 5.3 MEDIUM | Mermaid radar diagrams are vulnerable to DoS |
| CVE-2026-71436 | 5.3 MEDIUM | Mermaid XY Charts are vulnerable to an infinite loop DoS |
| CVE-2026-71438 | 2.4 LOW | Mermaid configuration APIs allow prototype pollution |
IV. Related Vulnerabilities
Same product: mermaid
- CVE-2026-71439
Mermaid radar diagrams are vulnerable to DoS - CVE-2026-71438
Mermaid configuration APIs allow prototype pollution - CVE-2026-71437
Mermaid Architecture diagrams are vulnerable to prototype po - CVE-2026-71436
Mermaid XY Charts are vulnerable to an infinite loop DoS - CVE-2026-41150
Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS
Same vendor: mermaid-js
- CVE-2026-71439
Mermaid radar diagrams are vulnerable to DoS - CVE-2026-71438
Mermaid configuration APIs allow prototype pollution - CVE-2026-71437
Mermaid Architecture diagrams are vulnerable to prototype po - CVE-2026-71436
Mermaid XY Charts are vulnerable to an infinite loop DoS - CVE-2026-41150
Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS
Same weakness: CWE-94
- CVE-2026-48054
OpenZeppelin Contracts Wizard has Code Injection in Generate - CVE-2026-45572
Decidim: HTML content blocks allow stored script execution - CVE-2026-19060
FoundationAgents MetaGPT code injection - CVE-2026-19058
FoundationAgents MetaGPT data_interpreter.py DataInterpreter - CVE-2026-66709
WordPress CTX Feed plugin <= 6.6.42 - Remote Code Execution
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