PT-2026-50691 · Eclipse Foundation · Eclipse Theia

Piotr Ryciak · Published 2026-06-18 · Updated 2026-06-18 · CVE-2026-46580

Mitre

CVSS v4.0

8.4

High

Base vector

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

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.

Fix

Weakness Enumeration

CWE-1427

CWE-829

Related Identifiers

CVE-2026-46580

Affected Products

Eclipse Theia

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-46580 · Security Note
• https://gitlab.eclipse.org/security/cve-assignment/-/work_items/114 · Note