CVE-2026-40598
MantisBT has Potential Referer-Based Reflected HTML Injection / XSS in Tag Update Page
Description
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. ### Impact Cross-site scripting (XSS). ### Patches - b1ebc57763f104eb5f541b7b4d1ce6948168abd9 ### Workarounds None ### Credits Thanks to siunam (Tang Cheuk Hei) for discovering and responsibly reporting the issue.
How to fix CVE-2026-40598
To remediate CVE-2026-40598, upgrade the affected package to a fixed version below.
- —upgrade to 2.28.2 or later
Is CVE-2026-40598 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 2.28.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N |