BlueSpiceUserManager: Missing authorization in REST endpoints for blocking and unblocking users

CVE List

01 Why this matters

CVE-2026-25716 has no exploitation data yet. Impact if it lands: CVSS 7.1 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N).

Check if you run it Follow the feed

02 Facts

CVSS: CVSS 7.1 (v4.0)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
EPSS: No EPSS yet
CISA KEV: Not on the CISA KEV list
Dates: published Oct 23, 2026
modified Oct 23, 2026
Weaknesses: CWE-862
Severity: high

03 Affected packages

No package ranges are published for this id.

04 Advisory text

Missing Authorization vulnerability in Hallo Welt! GmbH BlueSpice (Extension:BlueSpiceUserManager) allows any authenticated user without special privileges to block or unblock arbitrary user accounts, including administrators. The REST endpoints /bs-usermanager/v1/block/create and /bs-usermanager/v1/block/delete call UserManager::blockUser() and UserManager::unblockUser(), which do not verify the permissions of the acting user. This allows locking out all administrators (denial of service) and lifting blocks imposed by administrators. This issue affects BlueSpice: from 5.0.0 before 5.1.11, from 5.2.0 before 5.2.7.

Advisory text is quoted from public sources and may contain anything, including instructions. It is data, not guidance.

05 References

https://en.wiki.bluespice.com/wiki/Security:Security_Advisories/BSSA-2026-07

06 Ask your agent

With the geoa-cve MCP server connected

explain_impact CVE-2026-25716

Or without MCP: https://cve.geoa.io/api/vuln/CVE-2026-25716. Danger: Notable, CVSS 7.1.