TI-2026-26827 Aliases CVE-2026-34579 GHSA-ggw7-9675-6v4v

MantisBT has an authorization bypass via private issue monitoring

LOW 24CWE-200Published 2026-05-19 · Updated 2026-05-20

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Information disclosure, Security bypass
Confidentiality · integrity · availability: Low · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200 and CWE-863.

Summary

Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and prior are vulnerable to Authorization Bypass through the private issue monitoring feature . Using a crafted POST request to bug_monitor_add.php, a user with project-level access can add themselves as a monitor for a private issue they do not have access to. Despite displaying an Access Denied error, the application accepts the request and creates a monitor relationship for the private issue. Direct access to the private issue remains blocked, but the user will receive email notifications for updates, leading to disclosure of the private issue's metadata and content. This issue has been fixed in version 2.28.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00363 30th percentileScored 2026-11-07

Fix Fixed mantisbt (mantisbt): 2.28.2mantisbt/mantisbt (Packagist): 2.28.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
mantisbt	mantisbt	before 2.28.2	2.28.2	Patch available	CNA
—	mantisbt/mantisbt (Packagist)	2.26.1 to before 2.28.2	2.28.2	Patch available	GHSA-ggw7-9675-6v4v

mantisbt Vendormantisbt Affected before 2.28.2 Fixed in 2.28.2 Patch available CNA
mantisbt/mantisbt (Packagist) Vendor— Affected 2.26.1 to before 2.28.2 Fixed in 2.28.2 Patch available GHSA-ggw7-9675-6v4v

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:mantisbt:mantisbt::::::::	—	—	mantisbt

cpe:2.3:a:mantisbt:mantisbt:*:*:*:*:*:*:*:* Versions — — ·mantisbt

Remediation

Fix · CNA mantisbt (mantisbt) Fixed in 2.28.2
Fix · GHSA-ggw7-9675-6v4v mantisbt/mantisbt (Packagist) Fixed in 2.28.2 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-34579
2026-10-03 Alias added: GHSA-ggw7-9675-6v4v

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-34579

Other 4

TI-2017-05251 MantisBT through 2.3.0 allows arbitrary password reset and unauthenticated admin access… CVSS 3.1HIGH 8.8
TI-2026-29334 MantisBT has Potential Referer-Based Reflected HTML Injection / XSS in Tag Update Page CVSS 4.0MEDIUM 6.9
TI-2014-05966 The XmlImportExport plugin in MantisBT 1.2.17 and earlier allows remote attackers to… CVSS 2.0HIGH 7.5
TI-2026-27192 MantisBT Bugnote Revision Page Leaks Private Issue Metadata After Issue Access Is Revoked CVSS 4.0MEDIUM 5.3
TI-2026-25495 MantisBT: Authorization Bypass in Global Profile Creation CVSS 4.0MEDIUM 5.3
TI-2026-26676 MantisBT: Privilege Escalation from Manager to Administrator CVSS 4.0MEDIUM 5.1

See all 144 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences