Read the docs
TI-2026-34242 Aliases CVE-2026-46580GHSA-m973-pr9r-hp2w

In Eclipse Theia versions prior to 1.71.0, files matching the pattern…

Priority LOW 39CWE-1427Published · Updated

Key facts

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

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

Summary

In Eclipse Theia versions prior to 1.71.0, files matching the pattern .prompts/*.prompttemplate in a workspace were automatically loaded and could override or extend the AI agent's system prompts. An attacker could craft a malicious repository containing prompt template files that, when the workspace was opened in Theia, replaced the AI's system instructions with attacker-controlled content (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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00507 43rd percentileScored 2026-11-07
Fix Fixed Eclipse Theia (Eclipse Foundation): 1.71.0@theia/ai-chat-ui (npm): 1.71.0+5 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
Eclipse FoundationEclipse Theiabefore 1.71.01.71.0Patch availableCNA
—@theia/ai-chat-ui (npm)before 1.71.01.71.0Patch availableGHSA-m973-pr9r-hp2w
—@theia/ai-chat (npm)before 1.71.01.71.0Patch availableGHSA-m973-pr9r-hp2w
—@theia/ai-claude-code (npm)before 1.71.01.71.0Patch availableGHSA-m973-pr9r-hp2w
—@theia/ai-code-completion (npm)before 1.71.01.71.0Patch availableGHSA-m973-pr9r-hp2w
—@theia/ai-core (npm)before 1.71.01.71.0Patch availableGHSA-m973-pr9r-hp2w
—@theia/ai-editor (npm)before 1.71.01.71.0Patch availableGHSA-m973-pr9r-hp2w
  • 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-m973-pr9r-hp2w
  • @theia/ai-chat (npm) Vendor— Affected before 1.71.0 Fixed in 1.71.0 Patch available GHSA-m973-pr9r-hp2w
  • @theia/ai-claude-code (npm) Vendor— Affected before 1.71.0 Fixed in 1.71.0 Patch available GHSA-m973-pr9r-hp2w
  • @theia/ai-code-completion (npm) Vendor— Affected before 1.71.0 Fixed in 1.71.0 Patch available GHSA-m973-pr9r-hp2w
  • @theia/ai-core (npm) Vendor— Affected before 1.71.0 Fixed in 1.71.0 Patch available GHSA-m973-pr9r-hp2w
  • @theia/ai-editor (npm) Vendor— Affected before 1.71.0 Fixed in 1.71.0 Patch available GHSA-m973-pr9r-hp2w

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:*before 1.71.0VulnerableEclipse 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-m973-pr9r-hp2w @theia/ai-chat-ui (npm) Fixed in 1.71.0 Advisory →
  • Fix · GHSA-m973-pr9r-hp2w @theia/ai-chat (npm) Fixed in 1.71.0 Advisory →
  • Fix · GHSA-m973-pr9r-hp2w @theia/ai-claude-code (npm) Fixed in 1.71.0 Advisory →
  • Fix · GHSA-m973-pr9r-hp2w @theia/ai-code-completion (npm) Fixed in 1.71.0 Advisory →
  • Fix · GHSA-m973-pr9r-hp2w @theia/ai-core (npm) Fixed in 1.71.0 Advisory →
  • Fix · GHSA-m973-pr9r-hp2w @theia/ai-editor (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 ·

    Eclipse Theia 1.71.0

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-32580 In Eclipse Theia versions prior to 1.71.0, the AI chat agent processed workspace file and…Priority LOW 39
    • TI-2026-18120 In Eclipse Theia versions prior to 1.71.0, the AI chat rendered Markdown image tags from…Priority LOW 29
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-46580
  2. 2026-10-03 Alias added: GHSA-m973-pr9r-hp2w

References

Patch 1

Advisory 1

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