CVE-2026-22551: Medium severity Eclipse Eclipse Theia vulnerability

Published Jun 18, 2026
·
Updated

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

9 affected componentsFixes available
Eclipse Eclipse Theia<1.71.0
npm/@theia/ai-ide<1.71.0
1.71.0
npm/@theia/ai-editor<1.71.0
1.71.0
npm/@theia/ai-core<1.71.0
1.71.0
npm/@theia/ai-code-completion<1.71.0
1.71.0
npm/@theia/ai-claude-code<1.71.0
1.71.0
npm/@theia/ai-chat<1.71.0
1.71.0
npm/@theia/ai-chat-ui<1.71.0
1.71.0
Eclipse theia<1.71.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade npm/@theia/ai-ide to a version that resolves this vulnerability.

    Fixed in 1.71.0
  2. Upgrade

    Upgrade npm/@theia/ai-editor to a version that resolves this vulnerability.

    Fixed in 1.71.0
  3. Upgrade

    Upgrade npm/@theia/ai-core to a version that resolves this vulnerability.

    Fixed in 1.71.0
  4. Upgrade

    Upgrade npm/@theia/ai-code-completion to a version that resolves this vulnerability.

    Fixed in 1.71.0
  5. Upgrade

    Upgrade npm/@theia/ai-claude-code to a version that resolves this vulnerability.

    Fixed in 1.71.0
  6. Upgrade

    Upgrade npm/@theia/ai-chat to a version that resolves this vulnerability.

    Fixed in 1.71.0
  7. Upgrade

    Upgrade npm/@theia/ai-chat-ui to a version that resolves this vulnerability.

    Fixed in 1.71.0
  8. Configuration

    Enable workspace trust enforcement (introduced in v1.71.0) so that AI features are disabled in untrusted workspaces, preventing AI-rendered Markdown image tags from triggering HTTP requests to external URLs.

    Eclipse Theia workspace trust AI features in untrusted workspaces = disabled

Event History

Jun 18, 2026
CVE Published
via MITRE·02:32 PM
Data Sourced
via MITRE·02:32 PM
DescriptionWeakness
Data Sourced
via NVD·04:16 PM
RemedyDescriptionSeverityWeaknessAffected Software
Advisory Published
via GitHub·06:35 PM
Data Sourced
via GitHub·06:35 PM
DescriptionWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-22551?

CVE-2026-22551 has a medium severity score of 6.7 according to the CVSS system.

2

How do I fix CVE-2026-22551?

To fix CVE-2026-22551, update Eclipse Theia to version 1.71.0 or later.

3

What is the risk associated with CVE-2026-22551?

CVE-2026-22551 has a risk rating of 37, indicating a notable potential impact.

4

What kind of attacks can CVE-2026-22551 facilitate?

CVE-2026-22551 can facilitate attacks that involve constructing arbitrary external URLs through prompt injection.

5

Which versions of Eclipse Theia are affected by CVE-2026-22551?

Eclipse Theia versions prior to 1.71.0 are affected by CVE-2026-22551.

Company

Resources

Contact

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