CVE-2026-22551

Workspace data exfiltration via external Markdown images

Published Jun 18, 2026 · Updated Jun 18, 2026

Information disclosure in Eclipse Theia before 1.71.0 allows attackers to exfiltrate workspace data through AI chat responses. The AI chat Markdown renderer loads model-emitted image URLs without restricting external destinations, allowing sensitive workspace or conversation data to be encoded in requests. Exploitation requires prompt injection from a malicious workspace and active AI chat interaction; the documented consequence is confidentiality loss.

CVSS severity6.7
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Eclipse Theia before 1.71.0 allows attackers to exfiltrate workspace data through AI chat responses. The AI chat Markdown renderer loads model-emitted image URLs without restricting external destinations, allowing sensitive workspace or conversation data to be encoded in requests. Exploitation requires prompt injection from a malicious workspace and active AI chat interaction; the documented consequence is confidentiality loss.

The record

CVE
CVE-2026-22551
Published
Jun 18, 2026
Updated
Jun 18, 2026
Vendor
The Eclipse Foundation
Product
Eclipse Theia
Classifications
CWE-829, CWE-201, T1048
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.71.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Eclipse Foundation · Eclipse Theiaversion=0 <1.71.0

Published CVSS scores

6.7Eclipse FoundationCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-829Inclusion of Functionality from Untrusted Control Sphere
CWE-201Insertion of Sensitive Information Into Sent Data
T1048Exfiltration Over Alternative Protocol

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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