CVE-2026-10055: Eclipse Theia 1.26.0 to before 1.73.0

CVE-2026-10055. CVSS 3.1 base score 8.5 (HIGH, Vendor/CNA). EPSS 0.00399 (percentile 0.33889), scored 25-Oct-2026.

Affected technology

Eclipse Theia · 1.26.0 to before 1.73.0
Eclipse Foundation

Description’s affected range: version 1.26.0

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · Low privileges required · No user interaction required

What an attacker can do

A remote attacker with access to the Theia service connection can issue server-side HTTP requests to localhost or other backend-reachable hosts and read their responses, exposing internal administrative endpoints, cloud instance metadata services, and other resources that are intentionally outside the browser network boundary. Vendor/CNA’s CVSS 3.1 assessment (base score 8.5/10) rates confidentiality impact as high; integrity impact as low; availability impact as none.

Published 25-Oct-2026 21:45 UTC

CWE: CWE-200, CWE-918
CCR priority: 34.1 /100 (P4)
CVSS 3.1: 8.5 /10 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N · Vendor/CNA
EPSS: 0.00399 · percentile 0.33889 · 2026-10-25
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-25 21:44:36.062275+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-10055.html