CVE-2025-53640
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.
Does this matter?
Lower severity and a low EPSS score (0.66%). Track it; it rarely justifies an emergency change on its own.
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
- 5.3 MEDIUMCVSS: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/M
- EPSS
- 0.66% probability · 51th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-200, CWE-639, CWE-862
- Affected
- cern/indico
- Source
- security-advisories@github.com
EPSS 0.7% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://docs.getindico.io/en/stable/config/settings/#ALLOW_PUBLIC_USER_SEARCHProduct
- https://docs.getindico.io/en/stable/installation/upgradeProduct
- https://github.com/indico/indico/releases/tag/v3.3.7Release Notes
- https://github.com/indico/indico/security/advisories/GHSA-q28v-664f-q6wjVendor Advisory
- https://www.vicarius.io/vsociety/posts/cve202553640-detect-indico-vulnerabilityExploit, Third Party Advisory
- https://www.vicarius.io/vsociety/posts/cve202553640-mitigate-indico-vulnerabilityExploit, Mitigation, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.