CVE-2026-42277

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 90% 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
Elevated
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.

Onyx is an open-source AI platform. Prior to versions 3.0.9, 3.1.6, and 3.2.6, the GET /chat/file/{file_id} endpoint allows any authenticated user to download any other user's uploaded files by providing the file UUID. The endpoint verifies the caller is authenticated but never checks that the file belongs to them. An attacker who knows or obtains a file UUID can access confidential documents, chat attachments, and other files uploaded by any user in the system. This issue has been patched in versions 3.0.9, 3.1.6, and 3.2.6.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
10.1%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 12, 2026

Advisory Details (1)

Auto-updated May 8, 2026
Patch available. Sources: github.
github Patch Available

IDOR in /chat/file/{file_id} allows any authenticated user to download other users files · Advisory · onyx-dot-app/onyx · GitHub

https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-vg3h-35f7-7w6r

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 32× 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. 2026-07-24 14:17 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 03:11 UTCEG score recompute
  4. 2026-07-22 14:08 UTCEPSS rescore
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  10. 2026-07-16 06:19 UTCOSV refresh
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  1. 2026-07-01 15:06 UTCEPSS rescore
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  6. 2026-06-25 13:49 UTCEPSS rescore
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  8. 2026-06-24 14:05 UTCEPSS rescore
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  20. 2026-06-15 17:49 UTCEPSS rescore
  21. 2026-06-13 23:00 UTCEPSS rescore
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  25. 2026-06-10 22:18 UTCEPSS rescore
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  28. 2026-06-08 14:17 UTCEPSS rescore
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  30. 2026-06-07 15:25 UTCEPSS rescore
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  42. 2026-05-31 22:30 UTCEPSS rescore
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  44. 2026-05-31 00:16 UTCEPSS rescore
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  46. 2026-05-29 13:44 UTCEPSS rescore
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  48. 2026-05-28 13:44 UTCEPSS rescore
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  51. 2026-05-27 13:40 UTCEPSS rescore
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  54. 2026-05-26 13:44 UTCEPSS rescore
  55. 2026-05-26 07:18 UTCEPSS rescore
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  57. 2026-05-20 22:38 UTCEPSS rescore
  58. 2026-05-20 22:38 UTCEPSS rescore
  59. 2026-05-20 13:48 UTCEG score recompute
  60. 2026-05-20 11:22 UTCEPSS rescore
  61. 2026-05-20 11:22 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-42277?
CVE-2026-42277 is a medium vulnerability published on May 8, 2026. Onyx is an open-source AI platform. Prior to versions 3.0.9, 3.1.6, and 3.2.6, the GET /chat/file/{file_id} endpoint allows any authenticated user to download any other user's uploaded files by providing the file UUID. The endpoint verifies the caller is authenticated but never checks that the file…
When was CVE-2026-42277 disclosed?
CVE-2026-42277 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42277 actively exploited?
CVE-2026-42277 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42277?
CVE-2026-42277 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-42277?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42277, 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.

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