CVE-2026-44688 — Vulnerability in @theia/ai-editor — CVE Details

HIGH

[Eclipse Theia] Indirect Prompt Injection via Adversarial Workspace File and Directory Names in AI Chat

Published June 18, 2026Updated September 10, 2026Source: osv

Summary

In Eclipse Theia versions prior to 1.71.0, the AI chat agent processed workspace file and directory names as part of its prompt context without distinguishing them from system instructions. An attacker could craft a malicious repository with adversarial directory or file names that, when analyzed by the AI agent, would cause the agent to follow attacker-controlled instructions (indirect prompt injection). Combined with other AI chat features available in untrusted workspaces, this enabled attack chains leading to data exfiltration via Markdown image rendering or arbitrary command execution via task definitions.

Advisory Timeline

First published June 18, 2026 (116 days ago).
Last revised September 10, 2026 — 83 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm

Update @theia/ai-editor to 1.71.0 or later

npm install @theia/ai-editor@1.71.0

npm

Update @theia/ai-chat-ui to 1.71.0 or later

npm install @theia/ai-chat-ui@1.71.0

npm

Update @theia/ai-chat to 1.71.0 or later

npm install @theia/ai-chat@1.71.0

npm

Update @theia/ai-ide to 1.71.0 or later

npm install @theia/ai-ide@1.71.0

npm

Update @theia/ai-claude-code to 1.71.0 or later

npm install @theia/ai-claude-code@1.71.0

npm

Update @theia/ai-core to 1.71.0 or later

npm install @theia/ai-core@1.71.0

npm

Update @theia/ai-code-completion to 1.71.0 or later

npm install @theia/ai-code-completion@1.71.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (7)

Affects 1 ecosystem: npm (7).

Package	Ecosystem	Affected	Fixed In
@theia/ai-editor	npm	All versions	1.71.0
@theia/ai-chat-ui	npm	All versions	1.71.0
@theia/ai-chat	npm	All versions	1.71.0
@theia/ai-ide	npm	All versions	1.71.0
@theia/ai-claude-code	npm	All versions	1.71.0
@theia/ai-core	npm	All versions	1.71.0
@theia/ai-code-completion	npm	All versions	1.71.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-829
View on MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

—

Confidentiality

—

Integrity

—

Availability

—

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

Frequently Asked Questions

What is CVE-2026-44688?: [Eclipse Theia] Indirect Prompt Injection via Adversarial Workspace File and Directory Names in AI Chat This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2026-44688?: CVE-2026-44688 affects @theia/ai-editor, @theia/ai-chat-ui and @theia/ai-chat (and 4 more). Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-44688 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-3jww-hxqj-wfq2

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