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CVE-2026-54011

⚠️ high
🔍 Scan for this CVE
Summary

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6,Open WebUI renders Mermaid blocks from Markdown files in the file preview panel and inserts the generated SVG into the DOM using innerHTML. Because Mermaid is configured with securityLevel: 'loose', attacker-controlled Mermaid content can be rendered unsafely in this flow. A working payload was validated through the Markdown preview path, resulting in JavaScript execution in the vict

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6,Open WebUI renders Mermaid blocks from Markdown files in the file preview panel and inserts the generated SVG into the DOM using innerHTML. Because Mermaid is configured with securityLevel: 'loose', attacker-controlled Mermaid content can be rendered unsafely in this flow. A working payload was validated through the Markdown preview path, resulting in JavaScript execution in the victim’s browser under the application origin. This vulnerability is fixed in 0.9.6.

CVSS Score
8.7
High
EPSS Score
0.2
Exploit Probability
Published Date
2026-06-23
First Seen: 2026-06-25
📊 Relative Risk Intelligence

This CVE is High Risk - more severe than 80.9% of all 342,933 vulnerabilities in our database.

#65,570
Top 25% most severe
Severity Percentile
🎯 CISA SSVC Assessment Updated: Jun 23, 2026
🔍 Exploitation Status
Poc
Proof-of-concept available
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Total
Complete system compromise possible
SSVC data provided by CISA
Last Modified 2026-06-25
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
CWE IDs (Weakness Types)
CWE-79

📦 Affected Products 1

Vendor Product Status Affected Versions
openwebui open_webui Affected
< 0.9.6

🔗 References 1

https://github.com/open-webui/open-webui/security/ad...
Exploit Mitigation Vendor Advisory

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-56398 ⚠️ high 7.3 0.3 Open WebUI before 0.9.5 contains a stored cross-site scripting vulnerability in the OAuth authentication flow where the ... 2026-07-15
CVE-2026-56400 ⚠️ high 8.3 0.3 open-webui before 0.3.14 contains a cross-origin resource sharing misconfiguration allowing arbitrary origins with allow... 2026-07-15
CVE-2026-59212 🔶 medium 5.4 0.3 Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 before 0.10.0, _verify_... 2026-07-09
CVE-2026-59213 ℹ️ low 3.5 0.3 Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.27 before 0.10.0, get_all... 2026-07-09
CVE-2026-59214 ⚠️ high 7.3 0.3 Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, Open WebUI runs c... 2026-07-09
CVE-2026-59215 ℹ️ low 3.1 0.3 Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, channel thread pa... 2026-07-09
These CVEs affect the same products