PHP CVE-2026-34579

MEDIUM

Insertion of Sensitive Information Into Sent Data (CWE-201)

2026-05-11 https://github.com/mantisbt/mantisbt

GHSA-ggw7-9675-6v4v

PHP Information Disclosure

5.3

CVSS 4.0 · GitHub Advisory

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Severity by source

GitHub Advisory PRIMARY

5.3 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

X

Lifecycle Timeline

2

CVSS changed

May 19, 2026 - 23:22 NVD

5.3 (MEDIUM)

CVE Published

May 11, 2026 - 19:32 nvd

MEDIUM

DescriptionGitHub Advisory

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.

Impact

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.

Patches

0a93267deba445fb9d15250c16e6fdb1246ffa65

Workarounds

None

Credits

Thanks to Vishal Shukla for discovering and responsibly reporting the issue.

Analysis

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.

Impact

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.

Patches

0a93267deba445fb9d15250c16e6fdb1246ffa65

Workarounds

None

Credits

Thanks to Vishal Shukla for discovering and responsibly reporting the issue.

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CVE-2026-34579 vulnerability details – vuln.today

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