CVE-2026-34744Network attack vector

Authenticated attachment disclosure via missing parent-issue checks

Published May 19, 2026 · Updated May 19, 2026

Authorization bypass in MantisBT 2.28.1 and earlier allows remote authenticated users to list and download self-uploaded attachments. The file_can_view_or_download function and IssueFileGetCommand::validate method fail to verify view access to each attachment's parent issue. Exploitation requires an account that previously uploaded the files to an issue created by another user; no other users' attachments are exposed.

CVSS severity5.3
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Authorization bypass in MantisBT 2.28.1 and earlier allows remote authenticated users to list and download self-uploaded attachments. The file_can_view_or_download function and IssueFileGetCommand::validate method fail to verify view access to each attachment's parent issue. Exploitation requires an account that previously uploaded the files to an issue created by another user; no other users' attachments are exposed.

The record

CVE
CVE-2026-34744
Published
May 19, 2026
Updated
May 19, 2026
Vendor
MantisBT
Product
MantisBT
Classifications
CWE-200, CWE-281, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 19, 2026CVE publishedPublication date reported by the CVE source.
  2. May 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 2.28.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MantisBT · MantisBTversion=< 2.28.2

Published CVSS scores

5.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-281Improper Preservation of Permissions
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo