CVE-2026-34754 — Mantis Bug Tracker (MantisBT) is an open source issue
CVE-2026-34754 — Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and prior allow an authenticated user to upload attachments to private Issues they are not authorized to access. This issue has been fixed in version 2.28.2.
What This Means For You
- If your environment is affected by CWE-284, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-34754 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-34754 - MantisBT Unauthorized Attachment Upload
title: CVE-2026-34754 - MantisBT Unauthorized Attachment Upload
id: scw-2026-05-20-ai-1
status: experimental
level: high
description: |
Detects an authenticated user attempting to upload attachments to private issues they are not authorized to access in MantisBT versions prior to 2.28.2. This targets the specific vulnerability CVE-2026-34754 by looking for POST requests to file_api.php with parameters indicating an attachment upload to a bug, which is then processed by the vulnerable code path.
author: SCW Feed Engine (AI-generated)
date: 2026-05-20
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-34754/
tags:
- attack.privilege_escalation
- attack.t1138
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/mantisbt/file_api.php'
cs-method|exact: "POST"
sc-status|exact: "200"
cs-uri-query|contains:
- 'bug_id='
- 'type=bug'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-34754 | vulnerability | CVE-2026-34754 |
| CWE-284 | weakness | CWE-284 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 20, 2026 at 03:16 UTC |
This content was curated and summarized by Shimi's Cyber World for informational purposes. It is not copied or republished in full. All intellectual property rights remain with the original author and source.
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