How severe is CVE-2026-40196?

CVE-2026-40196 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-40196 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40196?

CVE-2026-40196 affects Sysadminsmedia Homebox. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40196?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-40196 have an EU (EUVD) identifier?

Yes. CVE-2026-40196 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23539.

When was CVE-2026-40196 published?

CVE-2026-40196 was published on 2026-04-17 and last updated on 2026-06-17.

CVE-2026-40196

CVE-2026-40196 is a high-severity vulnerability in Sysadminsmedia Homebox with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-708.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23539
Weakness: CWE-708
Affected product: Sysadminsmedia Homebox
Published: 2026-04-17
Last modified: 2026-06-17

Description

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ID remained permanently assigned to a user after being invited to a group, even after their access to that group was revoked.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.

Frequently asked questions

What is CVE-2026-40196?: 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.
How severe is CVE-2026-40196?: CVE-2026-40196 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-40196 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40196?: CVE-2026-40196 affects Sysadminsmedia Homebox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40196?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40196 have an EU (EUVD) identifier?: Yes. CVE-2026-40196 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23539.
When was CVE-2026-40196 published?: CVE-2026-40196 was published on 2026-04-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sysadminsmedia:homebox:*:*:*:*:*:*:*:*

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