CVE-2026-70618 Spacebar Server Missing Authorization via member-ids Endpoint
Authenticated users can enumerate all guild member IDs via an unprotected endpoint, exposing sensitive membership data.
- 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-2026-70618?
CVE-2026-70618 is a medium-severity missing authorization vulnerability in Spacebar Server, published on 5 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Spacebar Server before commit 51da17c contains a missing authorization vulnerability that allows any authenticated user to enumerate complete guild membership by querying the GET /guilds/{guild_id}/roles/{role_id}/member-ids endpoint without guild membership verification. Attackers can exploit the unprotected route handler in the roles member-ids endpoint, which lacks permission checks present in sibling endpoints, to retrieve the full list of member user IDs for any guild on the instance using only a valid bearer token and a known guild ID.
Weakness: CWE-862
Which versions are affected by CVE-2026-70618?
How do I fix CVE-2026-70618?
No fix has been published for CVE-2026-70618 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-2026-70618 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-70618 exists.
Sources
Also known as GHSA-67rh-63pc-xvpr, GHSA-p5cf-7hg9-gf65.