CVE-2026-47657 HumHub Missing Authorization on Remove All Space Members Action
An authenticated attacker can remove all members from any space in HumHub due to missing authorization checks, requiring an upgrade to fix.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-47657?
CVE-2026-47657 is a high-severity missing authorization vulnerability in humhub, published on 21 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-47657?
How do I fix CVE-2026-47657?
No fix has been published for CVE-2026-47657 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-47657 being exploited?
There is no known exploitation of CVE-2026-47657 in the wild and no public exploit code.
Sources
Also known as GHSA-hj67-5q6h-j7c2.