CVE-2026-33541Public exploitNetwork attack vector

Authenticated service interruption via validation-side database writes

Published Mar 26, 2026 · Updated Mar 26, 2026

Resource exhaustion in Miraheze TSPortal before 34 allows remote authenticated users to interrupt service via invalid DPA requests. The DPAAlreadyLive validation rule calls User::findOrCreate on a submitted username even when MirahezeUsernameRule rejects it, persisting a user record after the request fails. Any authenticated account can automate failing requests to drive unbounded database growth; the demonstrated consequence is storage and indexing exhaustion, not data disclosure or modification.

CVSS severity6.5
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Miraheze TSPortal before 34 allows remote authenticated users to interrupt service via invalid DPA requests. The DPAAlreadyLive validation rule calls User::findOrCreate on a submitted username even when MirahezeUsernameRule rejects it, persisting a user record after the request fails. Any authenticated account can automate failing requests to drive unbounded database growth; the demonstrated consequence is storage and indexing exhaustion, not data disclosure or modification.

The record

CVE
CVE-2026-33541
Published
Mar 26, 2026
Updated
Mar 26, 2026
Vendor
Miraheze
Product
TSPortal
Classifications
CWE-770, CWE-400, T1499.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 34

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Miraheze · TSPortalversion=< 34

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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