CVE-2026-41897: MantisBT is Vulnerable to Reflected XSS in Rendering Dynamic Custom Textarea Field

May 11, 2026 (updated June 9, 2026)

Lack of validation of filter_target parameter on return_dynamic_filters.php (normally used as an AJAX in View Issues Page) allows an attacker to inject arbitrary HTML if the target is a TEXTAREA custom field.

References

github.com/advisories/GHSA-j7v9-f46r-2rp4
github.com/mantisbt/mantisbt/commit/c885af13f0b8596714ffe11df757c09f35fbd8f4
github.com/mantisbt/mantisbt/security/advisories/GHSA-j7v9-f46r-2rp4
mantisbt.org/bugs/view.php?id=37013
nvd.nist.gov/vuln/detail/CVE-2026-41897

Code Behaviors & Features

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