Vulnerability Description
Open Event Server through 1.19.1 contains a missing authentication vulnerability that allows unauthenticated attackers to export the complete member roster of any group, including email addresses, names, join dates, and roles, by submitting requests to the group followers CSV export endpoint which lacks any authentication decorator. Attackers can enumerate sequential group IDs via brute-force, trigger an export via the unauthenticated POST endpoint, then poll the unauthenticated task status endpoint until completion to retrieve a download URL containing the full member CSV.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/geo-chen/oss/blob/main/open-event-server.md
- https://www.vulncheck.com/advisories/open-event-server-unauthenticated-member-ro
FAQ
What is CVE-2026-63101?
CVE-2026-63101 is a vulnerability with a CVSS score of 7.5 (HIGH). Open Event Server through 1.19.1 contains a missing authentication vulnerability that allows unauthenticated attackers to export the complete member roster of any group, including email addresses, nam...
How severe is CVE-2026-63101?
CVE-2026-63101 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-63101?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.