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VulnerabilityPublished Updated

CVE-2026-10055: Eclipse Theia · Server-Side Request Forgery (SSRF)

Affects Eclipse TheiaSource CVE Database V5

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Not known to be exploited · CVSS 8.5 High : upgrade to 1.73.0 soon.

Data as of 14 Nov 2026, 20:43 UTC

CVSS 3.1 base score
8.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 34% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.73.0
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 14 Nov 2026.

What to do

Upgrade Eclipse Theia to 1.73.0.

Affected software

ProductAffectedFixed in
Eclipse FoundationEclipse TheiaAffected
  • >=1.26.0 <1.73.0
Fixed in
  • 1.73.0
GitHubeclipse-theia/theiapkg:github/eclipse-theia/theiaOther threatsAffected
  • =1.26.0
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

If you cannot patch yet, restrict access to the Theia service connection to trusted users only and avoid exposing it publicly or in multi-tenant environments accessible by untrusted parties.

Description

In Eclipse Theia since version 1.26.0, the backend /services/request-service RPC accepts an attacker-controlled URL from any client connected to the standard /services messaging endpoint, performs the HTTP request server-side, and returns the full response body to the caller. Because the destination URL is neither validated nor allowlisted, 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. The vulnerability affects deployments where the Theia service connection is reachable by untrusted users (for example, multi-tenant or publicly-reachable Theia deployments).

References

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