CVE-2026-63101 | Open Event Server through 1.19.1 contains a missing authenti… | CVSS 7.5 HIGH

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.

Metadata

CVE ID: CVE-2026-63101
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-15 15:45 UTC
Published: 2026-07-17 15:51 UTC
Last updated: 2026-07-17 15:51 UTC
Primary CWE: CWE-306
Missing Authentication for Critical Function
Vendor / Product: fossasia / open-event-server
Sources: cve.org · NVD

Severity & Metrics

7.5 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products (1)

Vendor	Product	Platform	Versions
fossasia	open-event-server	—	0 ≤ 1.19.1

Weakness (CWE)

CWE	Source	Description
CWE-306	cna	Missing Authentication for Critical Function

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.7	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References (2)