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Fencer Intel
medium 6.5

CVE-2026-22551 json

[Eclipse Theia] Data Exfiltration via Markdown Image Rendering in AI Chat

published 4mo ago modified 14d ago also EUVD-2026-37900 , GHSA-qwjm-9c66-w4q4

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits
0
none known

Summary

In Eclipse Theia versions prior to 1.71.0, the AI chat rendered Markdown image tags from AI responses, triggering HTTP requests to arbitrary external URLs without restriction. Combined with prompt injection in a malicious workspace, an attacker could induce the AI agent to construct image URLs encoding sensitive information from the workspace or conversation context, exfiltrating it to attacker-controlled servers. The workspace trust enforcement introduced in v1.71.0 mitigates the documented attack chain by disabling AI features in untrusted workspaces.

Patch / fix

  • npm @theia/ai-chat-ui 1.71.0
  • npm @theia/ai-chat 1.71.0
  • npm @theia/ai-claude-code 1.71.0
  • npm @theia/ai-code-completion 1.71.0
  • npm @theia/ai-core 1.71.0
  • npm @theia/ai-editor 1.71.0
  • npm @theia/ai-ide 1.71.0
  • Eclipse Foundation Eclipse Theia 1.71.0

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4mo ago

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 6.7 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA 4.0 6.7 CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
npm @theia/ai-chat-ui
<1.71.0
1.71.0
npm @theia/ai-chat
<1.71.0
1.71.0
npm @theia/ai-claude-code
<1.71.0
1.71.0
npm @theia/ai-code-completion
<1.71.0
1.71.0
npm @theia/ai-core
<1.71.0
1.71.0
npm @theia/ai-editor
<1.71.0
1.71.0
npm @theia/ai-ide
<1.71.0
1.71.0

Affected products

  • Eclipse Foundation Eclipse Theia

Classification

Weakness
  • CWE-201 Insertion of Sensitive Information Into Sent Data
  • CWE-829 Inclusion of Functionality from Untrusted Control Sphere

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.