TI-2026-18120 Aliases CVE-2026-22551 GHSA-qwjm-9c66-w4q4

In Eclipse Theia versions prior to 1.71.0, the AI chat rendered Markdown image tags from…

LOW 29CWE-201Published 2026-06-18 · Updated 2026-06-18

Key facts

Attack vector: Local
Privileges required: None
User interaction: Active
Attack complexity: Low
Attack requirements: None
Impact type: Information disclosure, Code execution
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-201 and CWE-829.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00312 24th percentileScored 2026-11-07

Fix Fixed Eclipse Theia (Eclipse Foundation): 1.71.0@theia/ai-chat-ui (npm): 1.71.0+6 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Eclipse Foundation	Eclipse Theia	before 1.71.0	1.71.0	Patch available	CNA
—	@theia/ai-chat-ui (npm)	before 1.71.0	1.71.0	Patch available	GHSA-qwjm-9c66-w4q4
—	@theia/ai-chat (npm)	before 1.71.0	1.71.0	Patch available	GHSA-qwjm-9c66-w4q4
—	@theia/ai-claude-code (npm)	before 1.71.0	1.71.0	Patch available	GHSA-qwjm-9c66-w4q4
—	@theia/ai-code-completion (npm)	before 1.71.0	1.71.0	Patch available	GHSA-qwjm-9c66-w4q4
—	@theia/ai-core (npm)	before 1.71.0	1.71.0	Patch available	GHSA-qwjm-9c66-w4q4
—	@theia/ai-editor (npm)	before 1.71.0	1.71.0	Patch available	GHSA-qwjm-9c66-w4q4
—	@theia/ai-ide (npm)	before 1.71.0	1.71.0	Patch available	GHSA-qwjm-9c66-w4q4

Eclipse Theia VendorEclipse Foundation Affected before 1.71.0 Fixed in 1.71.0 Patch available CNA
@theia/ai-chat-ui (npm) Vendor— Affected before 1.71.0 Fixed in 1.71.0 Patch available GHSA-qwjm-9c66-w4q4
@theia/ai-chat (npm) Vendor— Affected before 1.71.0 Fixed in 1.71.0 Patch available GHSA-qwjm-9c66-w4q4
@theia/ai-claude-code (npm) Vendor— Affected before 1.71.0 Fixed in 1.71.0 Patch available GHSA-qwjm-9c66-w4q4
@theia/ai-code-completion (npm) Vendor— Affected before 1.71.0 Fixed in 1.71.0 Patch available GHSA-qwjm-9c66-w4q4
@theia/ai-core (npm) Vendor— Affected before 1.71.0 Fixed in 1.71.0 Patch available GHSA-qwjm-9c66-w4q4
@theia/ai-editor (npm) Vendor— Affected before 1.71.0 Fixed in 1.71.0 Patch available GHSA-qwjm-9c66-w4q4
@theia/ai-ide (npm) Vendor— Affected before 1.71.0 Fixed in 1.71.0 Patch available GHSA-qwjm-9c66-w4q4

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:eclipse:theia::::::::	before 1.71.0	Vulnerable	Eclipse Foundation

cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:* Versions before 1.71.0 Vulnerable ·Eclipse Foundation

Remediation

Fix · CNA Eclipse Theia (Eclipse Foundation) Fixed in 1.71.0
Fix · GHSA-qwjm-9c66-w4q4 @theia/ai-chat-ui (npm) Fixed in 1.71.0 Advisory →
Fix · GHSA-qwjm-9c66-w4q4 @theia/ai-chat (npm) Fixed in 1.71.0 Advisory →
Fix · GHSA-qwjm-9c66-w4q4 @theia/ai-claude-code (npm) Fixed in 1.71.0 Advisory →
Fix · GHSA-qwjm-9c66-w4q4 @theia/ai-code-completion (npm) Fixed in 1.71.0 Advisory →
Fix · GHSA-qwjm-9c66-w4q4 @theia/ai-core (npm) Fixed in 1.71.0 Advisory →
Fix · GHSA-qwjm-9c66-w4q4 @theia/ai-editor (npm) Fixed in 1.71.0 Advisory →
Fix · GHSA-qwjm-9c66-w4q4 @theia/ai-ide (npm) Fixed in 1.71.0 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-06-18
Eclipse Theia 1.71.0
3 records Highest priority Priority LOW 3 LOW
Other records, highest priority first
- TI-2026-34242 In Eclipse Theia versions prior to 1.71.0, files matching the pattern…Priority LOW 39
- TI-2026-32580 In Eclipse Theia versions prior to 1.71.0, the AI chat agent processed workspace file and…Priority LOW 39
Show all 3 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-22551
2026-10-03 Alias added: GHSA-qwjm-9c66-w4q4

References

Patch 1

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

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-22551

Other 4

TI-2026-12294 Prototype pollution in Eclipse Theia CVSS 4.0MEDIUM 5.7
TI-2021-13470 Path traversal in Eclipse Theia CVSS 3.1CRITICAL 9.8
TI-2020-16550 Cross-site scripting in Eclipse Theia CVSS 3.1CRITICAL 9.6
TI-2026-10807 Path traversal in Eclipse Theia CVSS 3.1HIGH 7.5
TI-2026-44283 Information disclosure in Eclipse Theia CVSS 3.1HIGH 7.5
TI-2026-42788 Path traversal in Eclipse Theia CVSS 3.1HIGH 8.8

See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences