MantisBT allows unauthorized users to upload attachments to restricted issues via REST API

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Summary

CVECVE-2026-34754
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-20 00:16:34 UTC
Updated2026-05-20 14:06:33 UTC
DescriptionMantis 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.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS: 0.000280000 probability, percentile 0.083210000 (date 2026-05-27)

Problem Types: CWE-284 | CWE-284 CWE-284: Improper Access Control

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mantisbt Mantisbt affected < 2.28.2 Not specified

References

ReferenceSourceLinkTags
github.com/mantisbt/mantisbt/commit/b262b4d2835b81394d75356dead66e52a627... [email protected] github.com
mantisbt.org/bugs/view.php [email protected] mantisbt.org
github.com/mantisbt/mantisbt/security/advisories/GHSA-h4x5-gvx6-3rwc [email protected] github.com
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