What is CVE-2026-46580?

CVE-2026-46580 is a high-severity vulnerability in Eclipse Theia, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 8.8/10. Published 2026-06-18.

How severe is CVE-2026-46580?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Eclipse Theia

CVE-2026-46580

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 reposi…

EPSS: 0.005 (40.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Eclipse Theia
Eclipse Foundation Theia — versions 0

Weakness classification (CWE)

CWE-829 — Inclusion of Functionality from Untrusted Control Sphere

References

emo@eclipse.org (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-46580?: CVE-2026-46580 is a high-severity vulnerability in Eclipse Theia, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 8.8/10. Published 2026-06-18.
How severe is CVE-2026-46580?: High severity. CVSS v3 base score is 8.8 out of 10.