CVE-2026-22551 medium CVSS 6.5

Vulnerability in @theia/ai-chat-ui (CVE-2026-22551)

Summary

Vulnerability in @theia/ai-chat-ui (CVE-2026-22551). Confidential information can be exposed externally. Mitigation: upgrade to 1.71.0 or later.

Original description

The description as published by the source.

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.

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-22551 has been found in @theia/ai-chat-ui.
Confidential information can be exposed externally. CVSS score: 6.5/10.
What to do: upgrade @theia/ai-chat-ui to 1.71.0 or later.
If unsure, ask your IT team or search "@theia/ai-chat-ui CVE-2026-22551" on the vendor's site.

CVE-2026-22551 (@theia/ai-chat-ui) — CWE-201 / CVSS v3 6.5
Attack vector: remote (network-reachable) / unauthenticated
Patched: 1.71.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-201) exists in @theia/ai-chat-ui.

📍 Affected scope

Check the vendor advisory for the affected versions of @theia/ai-chat-ui.

🔥 Severity

Severity: Medium (CVSS 6.5/10). Confidential information can be exposed externally.

🔧 How to fix

Update to 1.71.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r '@theia/ai-chat-ui' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
grep -r '@theia/ai-chat-ui' . | grep -v node_modules
```
リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で @theia/ai-chat-ui を grep し、稼働しているサービス・バージョンを把握する。
2
Apply patch patch
```
Upgrade @theia/ai-chat-ui to 1.71.0
```
ステージング環境で 1.71.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
3
Post-deployment verification verify
```
Confirm patched version is live in production
```
パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。