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Vulnerability record · CVE-2025-53640 · published 14 July 2025

CVE-2025-53640: Cern indico information exposure vulnerability

Cern · Indico

Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Starting in version 2.2 and prior to version 3.3.7, an endpoint used to display details of users listed in certain fields (such as ACLs) could be misused to dump basic user details (such as name, affiliation and email) in bulk. Version 3.3.7 fixes the issue. Owners of instances that allow everyone to create a user account, who wish to truly restrict access to these user details, should consider restricting user search to managers. As a workaround, it is possible to restrict access to the affected endpoints (e.g. in the webserver config), but doing so would break certain form fields which could no longer show the details of the users listed in those fields, so upgrading instead is highly recommended.

5.3 CVSS 4.0 Medium EPSS 0.60% · top 53.2% CWE-200 · Information exposureCWE-639 · Insecure direct object reference
5.3CVSS 4.0 base score
0.60%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Starting in version 2.2 and prior to version 3.3.7, an endpoint used to display details of users listed in certain fields (such as ACLs) could be misused to dump basic user details (such as name, affiliation and email) in bulk. Version 3.3.7 fixes the issue. Owners of instances that allow everyone to create a user account, who wish to truly restrict access to these user details, should consider restricting user search to managers. As a workaround, it is possible to restrict access to the affected endpoints (e.g. in the webserver config), but doing so would break certain form fields which could no longer show the details of the users listed in those fields, so upgrading instead is highly recommended.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://docs.getindico.io/en/stable/config/settings/#ALLOW_PUBLIC_USER_SEARCH Product
https://docs.getindico.io/en/stable/installation/upgrade Product
https://github.com/indico/indico/releases/tag/v3.3.7 Release Notes
https://github.com/indico/indico/security/advisories/GHSA-q28v-664f-q6wj Vendor Advisory
https://www.vicarius.io/vsociety/posts/cve202553640-detect-indico-vulnerability ExploitThird Party Advisory
https://www.vicarius.io/vsociety/posts/cve202553640-mitigate-indico-vulnerability ExploitMitigationThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-53640), CISA KEV, FIRST EPSS (scores of 2026-09-30). This page is refreshed as NVD updates the record.