CVE-2026-39960: medium-severity vulnerability in mantisbt
MantisBT is Vulnerable to Stored XSS through Custom Field Textarea Values
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.4epss 0.2%
Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and below contain flawed logic that causes improper escaping of a textarea custom field's contents in the Update Issue page, (bug_update_page.php) allowing an attacker to inject HTML and, if CSP settings permit, execute arbitrary JavaScript when the page is loaded. This facilitates session theft, leading to admin account takeover, full project data access. In order to exploit this issue, a textarea-type custom field must be configured for the project, the attack must be carried out by an authenticated user with bug report permission (low privilege). This can affect any user viewing the bug edit form, including administrators. The issue has been fixed in version 2.28.2. If users cannot immediately upgrade, they can work around the issue by using the default Content-Security Policy, which blocks script execution.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Affected products
mantisbt · mantisbtRelated CVEs — mantisbt
In the same product, most dangerous first.
CVE-2026-30849CRITICALMantisBT SOAP API has an authentication bypass vulnerability on MySQLEPSS 1.8%CVE-2024-34077HIGHMantisBT user account takeover in the signup/reset password processEPSS 1.2%CVE-2024-23830HIGHMantisBT Host Header Injection vulnerabilityEPSS 1.0%CVE-2023-44394MEDIUMDisclosure of project names to unauthorized users in MantisBTEPSS 0.7%CVE-2024-34080MEDIUMMantisBT Vulnerable to Exposure of Sensitive Information to an Unauthorized ActorEPSS 0.7%CVE-2026-47156CRITICALMantisBT: SOAP API Authentication Bypass with Privilege Escalation to AdministratorEPSS 0.7%