CVE-2026-22551

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 92% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
7.9%
KEV
Not listed

Published

June 18, 2026

Last Modified

June 22, 2026

Advisory Details (1)

Auto-updated Jun 18, 2026
No patch confirmed yet.
generic

[Eclipse Theia] Data Exfiltration via Markdown Image Rendering in AI Chat (#115) · Issues · Eclipse Projects Security / cve-assignment · GitLab

https://gitlab.eclipse.org/security/cve-assignment/-/work_items/115

Vendor Advisories for CVE-2026-22551(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(7 across 1 ecosystem)
npm(7)
PackageVulnerable rangeFixed inDependents
@theia/ai-chat—1.71.0—
@theia/ai-chat-ui—1.71.0—
@theia/ai-claude-code—1.71.0—
@theia/ai-code-completion—1.71.0—
@theia/ai-core—1.71.0—
@theia/ai-editor—1.71.0—
@theia/ai-ide—1.71.0—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 05:35 UTCEG score recompute
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 04:56 UTCEG score recompute
  5. 2026-07-05 04:09 UTCEG score recompute
  6. 2026-07-05 02:30 UTCEPSS rescore
  7. 2026-07-04 06:31 UTCEPSS rescore
  8. 2026-07-04 06:31 UTCEPSS rescore
  9. 2026-07-04 03:23 UTCEG score recompute
  10. 2026-07-03 02:34 UTCEG score recompute
  11. 2026-07-02 01:56 UTCEG score recompute
  12. 2026-07-01 15:06 UTCEPSS rescore
  13. 2026-07-01 15:06 UTCEPSS rescore
  14. 2026-07-01 01:18 UTCEG score recompute
  15. 2026-06-30 00:39 UTCEG score recompute
  16. 2026-06-29 14:06 UTCEPSS rescore
  17. 2026-06-29 00:01 UTCEG score recompute
  18. 2026-06-28 14:07 UTCEPSS rescore
  19. 2026-06-28 14:07 UTCEPSS rescore
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-28 04:56 UTCEPSS rescore
  22. 2026-06-27 23:23 UTCEG score recompute
  23. 2026-06-27 03:08 UTCEPSS rescore
  24. 2026-06-26 22:44 UTCEG score recompute
  25. 2026-06-25 22:04 UTCEG score recompute
Show 16 more
  1. 2026-06-25 13:49 UTCEPSS rescore
  2. 2026-06-25 13:49 UTCEPSS rescore
  3. 2026-06-24 21:24 UTCEG score recompute
  4. 2026-06-24 14:05 UTCEPSS rescore
  5. 2026-06-24 14:05 UTCEPSS rescore
  6. 2026-06-23 21:33 UTCEPSS rescore
  7. 2026-06-23 21:32 UTCEPSS rescore
  8. 2026-06-23 20:45 UTCEG score recompute▼ 0.20
  9. 2026-06-22 21:36 UTCNVD updateCVSS v3 → 6.5
  10. 2026-06-22 20:06 UTCEG score recompute
  11. 2026-06-21 19:25 UTCEG score recompute
  12. 2026-06-20 18:46 UTCEG score recompute
  13. 2026-06-19 18:06 UTCEG score recompute
  14. 2026-06-19 18:06 UTCGHSA enrichment
  15. 2026-06-18 17:26 UTCEG score recompute
  16. 2026-06-18 17:24 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-22551?
CVE-2026-22551 is a medium vulnerability published on June 18, 2026. 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…
When was CVE-2026-22551 disclosed?
CVE-2026-22551 was first published in the National Vulnerability Database on June 18, 2026, with the most recent update on June 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-22551 actively exploited?
CVE-2026-22551 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-22551?
CVE-2026-22551 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-22551?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-22551, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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