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PYSEC-2026-1462
indicoImpact
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.
[!TIP] If your instance allows everyone to create a user account, and you wish to truly restrict access to these user details, consider restricting user search to managers. You can find details on the newly introduced indico.conf setting
ALLOW_PUBLIC_USER_SEARCHin our documentation.
Patches
You should to update to Indico 3.3.7 as soon as possible. See the docs for instructions on how to update.
Workarounds
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.
For more information
If you have any questions or comments about this advisory:
- Open a thread in our forum
- Email us privately at indico-team@cern.ch
Credits
This vulnerability was identified during a security assessment conducted as part of the Red Team Residency Program at RNP (Rede Nacional de Ensino e Pesquisa). The research and testing were performed by a security researcher working under RNP’s authorization and coordination. Special acknowledgment goes to the RNP Security Team, which provided the infrastructure, methodology, and ethical oversight for this work.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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