What is CVE-2025-59034?

CVE-2025-59034 is a medium-severity vulnerability in Cern Indico, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2025-09-10.

How severe is CVE-2025-59034?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Cern Indico

CVE-2025-59034

Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Prior to version 3.3.8, a legacy API to retrieve user details could be misused to retrieve profile details of other users without having admin permissions due to a broken access check. Users should to update to Indico 3.3.8 as soon as possible. As a workaround, it is possible to restrict access to the affected API (e.g. in the webserver config).

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2025-09-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (15.7th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Cern Indico
Indico — versions < 3.3.8

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

github.com/indico/indico/security/advisories/GHSA-4269-mcfh-cp7q (Patch, Vendor Advisory)
github.com/indico/indico/releases/tag/v3.3.8 (Release Notes)

Frequently asked questions

What is CVE-2025-59034?: CVE-2025-59034 is a medium-severity vulnerability in Cern Indico, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2025-09-10.
How severe is CVE-2025-59034?: Medium severity. CVSS v3 base score is 4.3 out of 10.