Cross-site scripting via trusted raw agent text
Published Sep 16, 2026 · Updated Sep 16, 2026
Cross-site scripting in A2UI 0.10.0 through 0.10.7 allows remote attackers to execute script through agent-supplied text. The a2a-chat-canvas SanitizerMarkdownRendererService passes the original agent text to Angular bypassSecurityTrustHtml, and DefaultTextPart binds that trusted value to innerHTML without sanitization. An application must use the community sample's default renderer and display attacker-controlled agent text; successful exploitation runs script in the host application's origin.
Summary
What happened
Cross-site scripting in A2UI 0.10.0 through 0.10.7 allows remote attackers to execute script through agent-supplied text. The a2a-chat-canvas SanitizerMarkdownRendererService passes the original agent text to Angular bypassSecurityTrustHtml, and DefaultTextPart binds that trusted value to innerHTML without sanitization. An application must use the community sample's default renderer and display attacker-controlled agent text; successful exploitation runs script in the host application's origin.
The record
- CVE
- CVE-2026-92214
- Published
- Sep 16, 2026
- Updated
- Sep 16, 2026
- Vendor
- A2UI Project
- Product
- A2UI
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 16, 2026CVE publishedPublication date reported by the CVE source.
- Sep 16, 2026Record 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=0.10.0
- Affected versionversion=0.10.1
- Affected versionversion=0.10.2
- Affected versionversion=0.10.3
- Affected versionversion=0.10.4
- Affected versionversion=0.10.5
- Affected versionversion=0.10.6
- Affected versionversion=0.10.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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
- Issue #2294 demonstration payloadproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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