CVE-2026-40196

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 88% 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
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 0

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

HomeBox is a home inventory and organization system. Versions prior to 0.25.0 contain a vulnerability where the defaultGroup ID remained permanently assigned to a user after being invited to a group, even after their access to that group was revoked. While the web interface correctly enforced the access revocation and prevented the user from viewing or modifying the group's contents, the API did not. Because the original group ID persisted as the user's defaultGroup, and this value was not properly validated when the X-Tenant header was omitted, the user could still perform full CRUD operations on the group's collections through the API, bypassing the intended access controls. This issue has been fixed in version 0.25.0.

CVSS v3
8.1
EG Score
8.1(medium)
EPSS
16.1%
KEV
Not listed

Published

April 17, 2026

Last Modified

April 24, 2026

Advisory Details (2)

Auto-updated May 6, 2026
Patch available. Sources: github.
github Patch Available

`defaultGroup` ID and access is retained after access to said group ("collection") is removed · Advisory · sysadminsmedia/homebox · GitHub

https://github.com/sysadminsmedia/homebox/security/advisories/GHSA-6pvm-v73p-p6m9
generic

Release v0.25.0 · sysadminsmedia/homebox · GitHub

https://github.com/sysadminsmedia/homebox/releases/tag/v0.25.0

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 34× 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. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:24 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-20 07:34 UTCOSV refresh
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  1. 2026-06-30 23:22 UTCEPSS rescore
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  6. 2026-06-25 13:49 UTCEPSS rescore
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  30. 2026-06-07 15:25 UTCEPSS rescore
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  40. 2026-06-02 20:13 UTCEPSS rescore
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  49. 2026-05-29 13:44 UTCEPSS rescore
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  60. 2026-05-20 22:38 UTCEPSS rescore
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  62. 2026-05-20 16:51 UTCEG score recompute
  63. 2026-05-20 11:22 UTCEPSS rescore
  64. 2026-05-20 11:22 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-40196?
CVE-2026-40196 is a high vulnerability published on April 17, 2026. HomeBox is a home inventory and organization system. Versions prior to 0.25.0 contain a vulnerability where the defaultGroup ID remained permanently assigned to a user after being invited to a group, even after their access to that group was revoked. While the web interface correctly enforced the…
When was CVE-2026-40196 disclosed?
CVE-2026-40196 was first published in the National Vulnerability Database on April 17, 2026, with the most recent update on April 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40196 actively exploited?
CVE-2026-40196 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 16.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40196?
CVE-2026-40196 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-40196?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40196, 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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