CVE-2026-33541: TSPortal's Uncontrolled User Creation via Validation Side Effects Leads to Potential Denial of Service

March 27, 2026

A flaw in TSPortal allowed attackers to create arbitrary user records in the database by abusing validation logic. While validation correctly rejected invalid usernames, a side effect within a validation rule caused user records to be created regardless of whether the request succeeded. This could be exploited to cause uncontrolled database growth, leading to a potential denial of service (DoS).

References

github.com/advisories/GHSA-f346-8rp3-4h9h
github.com/miraheze/TSPortal
github.com/miraheze/TSPortal/security/advisories/GHSA-f346-8rp3-4h9h
issue-tracker.miraheze.org/T15115
nvd.nist.gov/vuln/detail/CVE-2026-33541

Code Behaviors & Features

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