{"id":"CVE-2025-53640","aliases":["EUVD-2025-21385","GHSA-q28v-664f-q6wj","PYSEC-2026-1462"],"status":"published","title":"Indico vulnerable to user enumeration via API endpoint","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.","severity":{"version":"4.0","score":5.3,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00662,"percentile":0.51945,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-200","CWE-639","CWE-862"],"published":"2025-07-14T19:24:03Z","modified":"2026-10-28T02:30:58Z","exploits":[{"source":"pocgithub","id":"rafaelcorvino1/CVE-2025-53640","title":"rafaelcorvino1/CVE-2025-53640","date":"2025-07-19","url":"https://github.com/rafaelcorvino1/CVE-2025-53640"}],"fixes":[{"ecosystem":"PyPI","package":"indico","fixed_in":["3.3.7"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"indico","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.2"},{"fixed":"3.3.7"}]}]},{"source":"osv","ecosystem":"PyPI","package":"indico","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.2"},{"fixed":"3.3.7"}]}],"versions":["2.2","2.2.1","2.2.2","2.2.3","2.2.4","2.2.5","2.2.6","2.2.7","2.2.8","2.3","2.3.1","2.3.2","2.3.3","2.3.4","2.3.5","3.0","3.0.1","3.0.2","3.0.3","3.0rc1","3.0rc2","3.1","3.1.1","3.2","3.2.1","3.2.2","3.2.3","3.2.4","3.2.5","3.2.6","3.2.7","3.2.8","3.2.9","3.3","3.3.1","3.3.2","3.3.3","3.3.4","3.3.5","3.3.6"]},{"source":"osv","ecosystem":"PyPI","package":"indico","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.2"},{"fixed":"3.3.7"}]}],"versions":["2.2","2.2.1","2.2.2","2.2.3","2.2.4","2.2.5","2.2.6","2.2.7","2.2.8","2.3","2.3.1","2.3.2","2.3.3","2.3.4","2.3.5","3.0","3.0.1","3.0.2","3.0.3","3.0rc1","3.0rc2","3.1","3.1.1","3.2","3.2.1","3.2.2","3.2.3","3.2.4","3.2.5","3.2.6","3.2.7","3.2.8","3.2.9","3.3","3.3.1","3.3.2","3.3.3","3.3.4","3.3.5","3.3.6"]}],"products":[{"vendor":"cern","product":"indico"},{"vendor":"indico","product":"indico"}],"references":[{"url":"https://github.com/indico/indico/security/advisories/GHSA-q28v-664f-q6wj","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web"]},{"url":"https://docs.getindico.io/en/stable/config/settings/#ALLOW_PUBLIC_USER_SEARCH","tags":["x_refsource_MISC","Product","web"]},{"url":"https://docs.getindico.io/en/stable/installation/upgrade","tags":["x_refsource_MISC","Product","web"]},{"url":"https://github.com/indico/indico/releases/tag/v3.3.7","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://www.vicarius.io/vsociety/posts/cve202553640-detect-indico-vulnerability","tags":["Exploit","Third Party Advisory","web"]},{"url":"https://www.vicarius.io/vsociety/posts/cve202553640-mitigate-indico-vulnerability","tags":["Exploit","Mitigation","Third Party Advisory","web"]},{"url":"https://github.com/indico/indico/pull/6936/commits/f8583557a3da56aeea8857ae69bf17c9066c95c1","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-53640","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-q28v-664f-q6wj","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/53xxx/CVE-2025-53640.json","tags":["advisory"]},{"url":"https://github.com/indico/indico","tags":["package"]},{"url":"https://pypi.org/project/indico","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-53640","title":"Indico vulnerable to user enumeration via API endpoint","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.","status":"published","published":"2025-07-14T20:14:27.041Z","modified":"2025-07-22T15:29:26.173Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium","assessor":"cna"}],"cwes":["CWE-200","CWE-639","CWE-862"],"updated_at":"2026-11-02T14:32:49.180768Z"}],"euvd":[{"id":"EUVD-2025-21385","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.","status":"published","published":"2025-07-14T20:14:27Z","modified":"2025-07-22T15:29:26Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T20:32:05.744165Z"}],"ghsa":[{"id":"GHSA-q28v-664f-q6wj","title":"Indico vulnerability allows attackers to bulk dump user details","description":"### Impact\nAn 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.\n\n\u003e [!TIP]\n\u003e 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_SEARCH`](https://docs.getindico.io/en/stable/config/settings/#ALLOW_PUBLIC_USER_SEARCH) in our documentation.\n\n### Patches\nYou should to update to [Indico 3.3.7](https://github.com/indico/indico/releases/tag/v3.3.7) as soon as possible.\nSee [the docs](https://docs.getindico.io/en/stable/installation/upgrade/) for instructions on how to update.\n\n### Workarounds\nIt 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.\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n- Open a thread in [our forum](https://talk.getindico.io/)\n- Email us privately at [indico-team@cern.ch](mailto:indico-team@cern.ch)\n\n#### Credits\nThis vulnerability was identified during a security assessment conducted as part of the Red Team Residency Program at RNP (Rede Nacional de Ensino e Pesquisa).\nThe research and testing were performed by a security researcher working under RNP’s authorization and coordination.\nSpecial acknowledgment goes to the RNP Security Team, which provided the infrastructure, methodology, and ethical oversight for this work.","status":"published","published":"2025-07-14T19:24:03Z","modified":"2025-07-22T18:33:43Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium"}],"cwes":["CWE-200","CWE-639","CWE-862"],"updated_at":"2026-11-02T14:38:51.864708Z"}],"nvd":[{"id":"CVE-2025-53640","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.","status":"published","published":"2025-07-14T21:15:27.663Z","modified":"2026-06-17T09:38:37.36Z","cvss":[{"version":"4.0","score":5.3,"vector":"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:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200","CWE-639","CWE-862"],"updated_at":"2026-11-02T14:11:18.285862Z"}],"osv":[{"id":"CVE-2025-53640","title":"Indico vulnerable to user enumeration via API endpoint","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.","status":"published","published":"2025-07-14T20:14:27.041Z","modified":"2026-10-28T02:30:58.249703266Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium"}],"cwes":["CWE-200","CWE-639","CWE-862"],"updated_at":"2026-11-02T15:44:50.45326Z"},{"id":"GHSA-q28v-664f-q6wj","title":"Indico vulnerability allows attackers to bulk dump user details","description":"### Impact\nAn 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.\n\n\u003e [!TIP]\n\u003e 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_SEARCH`](https://docs.getindico.io/en/stable/config/settings/#ALLOW_PUBLIC_USER_SEARCH) in our documentation.\n\n### Patches\nYou should to update to [Indico 3.3.7](https://github.com/indico/indico/releases/tag/v3.3.7) as soon as possible.\nSee [the docs](https://docs.getindico.io/en/stable/installation/upgrade/) for instructions on how to update.\n\n### Workarounds\nIt 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.\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n- Open a thread in [our forum](https://talk.getindico.io/)\n- Email us privately at [indico-team@cern.ch](mailto:indico-team@cern.ch)\n\n#### Credits\nThis vulnerability was identified during a security assessment conducted as part of the Red Team Residency Program at RNP (Rede Nacional de Ensino e Pesquisa).\nThe research and testing were performed by a security researcher working under RNP’s authorization and coordination.\nSpecial acknowledgment goes to the RNP Security Team, which provided the infrastructure, methodology, and ethical oversight for this work.","status":"published","published":"2025-07-14T19:24:03Z","modified":"2026-07-07T17:57:10.621929147Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium"}],"cwes":["CWE-200","CWE-639","CWE-862"],"updated_at":"2026-11-02T15:46:53.700556Z"},{"id":"PYSEC-2026-1462","title":"Indico vulnerability allows attackers to bulk dump user details","description":"### Impact\nAn 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.\n\n\u003e [!TIP]\n\u003e 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_SEARCH`](https://docs.getindico.io/en/stable/config/settings/#ALLOW_PUBLIC_USER_SEARCH) in our documentation.\n\n### Patches\nYou should to update to [Indico 3.3.7](https://github.com/indico/indico/releases/tag/v3.3.7) as soon as possible.\nSee [the docs](https://docs.getindico.io/en/stable/installation/upgrade/) for instructions on how to update.\n\n### Workarounds\nIt 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.\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n- Open a thread in [our forum](https://talk.getindico.io/)\n- Email us privately at [indico-team@cern.ch](mailto:indico-team@cern.ch)\n\n#### Credits\nThis vulnerability was identified during a security assessment conducted as part of the Red Team Residency Program at RNP (Rede Nacional de Ensino e Pesquisa).\nThe research and testing were performed by a security researcher working under RNP’s authorization and coordination.\nSpecial acknowledgment goes to the RNP Security Team, which provided the infrastructure, methodology, and ethical oversight for this work.","status":"published","published":"2026-07-07T16:02:57.759549Z","modified":"2026-07-07T17:47:15.590072771Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T15:52:55.06457Z"}]}}