PT-2026-60804 · Fossasia · Open-Event-Server

George Chen · CVE-2026-63101 · Published 2026-07-17 · Updated 2026-07-17

NVD

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

Exploit

Fix

Missing Authentication

Weakness Enumeration

CWE-306

Related Identifiers

CVE-2026-63101

Affected Products

Open-Event-Server

References · 3

• 🔥 https://github.com/geo-chen/oss/blob/main/open-event-server.md · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-63101 · Security Note
• https://vulncheck.com/advisories/open-event-server-unauthenticated-member-roster-export-via-csv-export-endpoint · Note