CVE-2026-40598

MantisBT has Potential Referer-Based Reflected HTML Injection / XSS in Tag Update Page

MEDIUM
6.9
CVSS Score
Published: May 22, 2026 at 07:32 PM UTC
Updated: July 23, 2026 at 07:32 PM UTC
1 product affected across 1 vendormantisBT

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Severity
MEDIUM6.9
Exploit prediction
EPSS 0.4%
SSVC
PoC

Description

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.28.1 and below, improper escaping of the redirection page (retrieved from the request's Referer header) allows an attacker to inject HTML. While this is generally not directly actionable as modern browsers will URL-encode special characters, on some specific server configurations this could poison the cache, leading to cross-site scripting. This issue has been fixed in version 2.28.2.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 2.28.2
Affected range stops below 2.28.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.9MEDIUMGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79

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