CVE-2026-70618

Summary

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.

Affected Software

Weaknesses

• CWE-862: Missing Authorization

References

• https://github.com/spacebarchat/server/security/advisories/GHSA-p5cf-7hg9-gf65
• https://github.com/spacebarchat/server/commit/51da17cf19d476483ee44e5f832d1ebdcd844f88
• https://www.vulncheck.com/advisories/spacebar-server-missing-authorization-via-member-ids-endpoint

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