CVE Catalog

CVE-2026-63101

HighCVSS 7.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.30%

22th percentile - higher than 22% of all known CVEs

Summary

Open Event Server up to version 1.19.1 has a missing authentication vulnerability in the group followers CSV export endpoint, allowing unauthenticated attackers to export the complete member roster of any group, including email addresses, names, join dates, and roles. Attackers can brute-force sequential group IDs, trigger an export via the unauthenticated POST endpoint, and poll the unauthenticated task status endpoint until completion to obtain a download URL with the full member CSV.

Risk Assessment

The risk involves potential mass leakage of personal data of group members, violating user privacy and potentially leading to legal consequences under GDPR and loss of organizational trust.

Recommendation

Immediately update Open Event Server to the latest version that fixes this vulnerability and enforce authentication on all data export endpoints.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS