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CVE-2026-46580

HIGH
8.4
CVSS 4.0
Description
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.

Metadata

CVE ID
CVE-2026-46580
State
PUBLISHED
Assigner
eclipse
Reserved
2026-05-22 07:47 UTC
Published
2026-06-18 14:26 UTC
Last updated
2026-06-19 03:55 UTC
Primary CWE
CWE-829
CWE-829: Inclusion of Functionality from Untrusted Control S…
Vendor / Product
Eclipse Foundation / Eclipse Theia
Sources
cve.org  ·  NVD

Severity & Metrics

8.4 HIGH CVSS 4.0
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
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
Eclipse Foundation Eclipse Theia — 0 < 1.71.0
Weakness (CWE)
CWESourceDescription
CWE-1427 cna CWE-1427: Improper Neutralization of Input Used for LLM Prompting
CWE-829 cna CWE-829: Inclusion of Functionality from Untrusted Control Sphere
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.4 HIGH 4.0 cna 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 (1)
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