What’s Vulnerable › Vulnerabilities

CVE-2026-70618: Spacebar Server Missing Authorization via member-ids Endpoint

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-05 · updated 2026-09-16
• Weakness: CWE-862

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.

Affected products

• Spacebar Server: all versions

References

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

Get alerted when CVE-2026-70618 or the next vulnerability affects your stack