CVE-2026-40866

HIGHNVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.6 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 84% 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
8.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.6Exploit: NoneExposed: 0

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

Horilla is a free and open source Human Resource Management System (HRMS). In 1.5.0, an insecure direct object reference in the employee document upload endpoint allows any authenticated user to overwrite or replace or corrupt another employee’s document by changing the document ID in the upload request. This enables unauthorized modification of HR records.

CVSS v3
8.6
EG Score
8.6(medium)
EPSS
10.8%
KEV
Not listed

Published

April 21, 2026

Last Modified

April 22, 2026

Advisory Details (1)

Auto-updated May 3, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Unauthorized Document Overwrite via File Upload Endpoint · Advisory · horilla/horilla-hr · GitHub

https://github.com/horilla/horilla-hr/security/advisories/GHSA-q2qh-v828-r4p7

Weakness Classification(2)

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. 2026-07-16 17:03 UTCEPSS rescore
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  1. 2026-06-21 14:56 UTCEPSS rescore
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  22. 2026-06-10 03:38 UTCEG score recompute
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Frequently asked(5)

What is CVE-2026-40866?
CVE-2026-40866 is a high vulnerability published on April 21, 2026. Horilla is a free and open source Human Resource Management System (HRMS). In 1.5.0, an insecure direct object reference in the employee document upload endpoint allows any authenticated user to overwrite or replace or corrupt another employee’s document by changing the document ID in the upload…
When was CVE-2026-40866 disclosed?
CVE-2026-40866 was first published in the National Vulnerability Database on April 21, 2026, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40866 actively exploited?
CVE-2026-40866 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40866?
CVE-2026-40866 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-40866?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40866, 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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