[Eclipse Theia] Data Exfiltration via Markdown Image Rendering in AI Chat
In Eclipse Theia versions prior to 1.71.0, the AI chat rendered Markdown image tags from AI responses, triggering HTTP requests to arbitrary external URLs without restriction. Combined with prompt injection in a malicious workspace, an attacker could induce the AI agent to construct image URLs encoding sensitive information from the workspace or conversation context, exfiltrating it to attacker-controlled servers. The workspace trust enforcement introduced in v1.71.0 mitigates the documented attack chain by disabling AI features in untrusted workspaces.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @theia/ai-chat | < 1.71.0 | 1.71.0 |
| npm package | @theia/ai-chat-ui | < 1.71.0 | 1.71.0 |
| npm package | @theia/ai-claude-code | < 1.71.0 | 1.71.0 |
| npm package | @theia/ai-code-completion | < 1.71.0 | 1.71.0 |
| npm package | @theia/ai-core | < 1.71.0 | 1.71.0 |
| npm package | @theia/ai-editor | < 1.71.0 | 1.71.0 |
| npm package | @theia/ai-ide | < 1.71.0 | 1.71.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-22551
- https://github.com/eclipse-theia/theia/issues/16892
- https://github.com/eclipse-theia/theia/pull/17364
- https://github.com/eclipse-theia/theia/commit/e3fdfe6992389bc5fa611058d00c39d7408508ed
- https://github.com/eclipse-theia/theia
- https://gitlab.eclipse.org/security/cve-assignment/-/work_items/115
- CVSS vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-201- Platform
- npm
- Package
@theia/ai-chat, @theia/ai-chat-ui, @theia/ai-claude-code- Disclosed
- 18.06.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-qwjm-9c66-w4q4 - CC BY 4.0
Vulnerability history: @theia/ai-claude-code
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 06.2026 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 1
Disclosures per year
- 2026: 3
-
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