Improperly Implemented Security Check for Standard Affecting mantisbt/mantisbt package, versions <2.28.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-MANTISBTMANTISBT-16642110
- published12 May 2026
- disclosed11 May 2026
- creditsiunam321
Introduced: 11 May 2026
CVE-2026-40597 (opens in a new tab)How to fix?
Upgrade mantisbt/mantisbt to version 2.28.2 or higher.
Overview
mantisbt/mantisbt is a mantis bug tracker.
Affected versions of this package are vulnerable to Improperly Implemented Security Check for Standard in the file_download.php process. An attacker can execute arbitrary JavaScript code in the context of a user's browser by uploading a specially crafted attachment that is interpreted as a valid JavaScript MIME type, thereby bypassing the Content Security Policy's script restrictions when accessed. This is only exploitable if there is an existing cross-site scripting or HTML injection vulnerability present in the environment.