TSPortal's Uncontrolled User Creation via Validation Side Effects Leads to Potential Denial of Service

published 2026-03-26 7 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-16398 , GHSA-f346-8rp3-4h9h

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits: 0; none known

TSPortal is the WikiTide Foundation’s in-house platform used by the Trust and Safety team to manage reports, investigations, appeals, and transparency work. Prior to version 34, 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). Version 34 contains a fix for the issue.

Patch / fix

fixed in 2

packagist miraheze/ts-portal 34
wikitide tsportal 34

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 7 mo ago (2026-03-27)

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/miraheze/TSPortal/security/advisories/GHSA-f346-8rp3-4h9h referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
GitHub	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
packagist	miraheze/ts-portal	<34	34

Affected products

miraheze TSPortal

Classification

Weakness

CWE-400 Uncontrolled Resource Consumption
CWE-770 Allocation of Resources Without Limits or Throttling

References

github.com /miraheze/TSPortal/security/advisories/GHSA-f346-8rp3-4h9h
web, exploit, mitigation, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2026-33541
advisory
github.com /miraheze/TSPortal
package
issue-tracker.miraheze.org /T15115
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary