Script execution via unsanitized Markdown comments
Published Jun 26, 2024 · Updated Aug 2, 2024
Cross-site scripting in Mermaid ZenUML Core before 3.23.25 allows remote attackers to execute JavaScript through diagram comments. The Comment.vue markedComment computation passes comment text through marked.parse and returns the resulting HTML without sanitization. Applications are exposed when they render attacker-controlled diagrams without sandboxing, allowing script execution in the embedding application's browser context.
Summary
What happened
Cross-site scripting in Mermaid ZenUML Core before 3.23.25 allows remote attackers to execute JavaScript through diagram comments. The Comment.vue markedComment computation passes comment text through marked.parse and returns the resulting HTML without sanitization. Applications are exposed when they render attacker-controlled diagrams without sandboxing, allowing script execution in the embedding application's browser context.
The record
- CVE
- CVE-2024-38527
- Published
- Jun 26, 2024
- Updated
- Aug 2, 2024
- Vendor
- Mermaid
- Product
- ZenUML Core
- Classifications
- CWE-79, CWE-80, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 26, 2024CVE publishedPublication date reported by the CVE source.
- Aug 2, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=3.0.0
- Affected versionversion=< 3.23.25
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- ZenUML Markdown comment XSS proof of concept conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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