Flask
CVE-2026-28352
MEDIUM
GHSA-rfpp-2hgm-gp5v
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Lifecycle Timeline
3DescriptionGitHub Advisory
Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. In versions prior to 3.3.11, the API endpoint used to manage event series is missing an access check, allowing unauthenticated/unauthorized access to this endpoint. The impact of this is limited to getting the metadata (title, category chain, start/end date) for events in an existing series, deleting an existing event series, and modifying an existing event series. This vulnerability does NOT allow unauthorized access to events (beyond the basic metadata mentioned above), nor any kind of tampering with user-visible data in events. Version 3.3.11 fixes the issue. As a workaround, use the webserver to restrict access to the series management API endpoint.
AnalysisAI
Missing authentication checks on Indico's event series management API endpoint allows unauthenticated attackers to view event metadata, delete series, and modify series configurations. The vulnerability affects Indico versions prior to 3.3.11 and has limited impact as it does not grant access to actual event data beyond basic metadata. …
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Vulnerability AssessmentAI
| Risk Assessment | CVSS 6.5 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker without authentication could exploit this vulnerability to compromise the affected system. |
| Remediation | A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Within 30 days: Identify affected systems running versions and apply vendor patches as part of regular patch cycle. …
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