{
"id": "GHSA-p6fr-rxq7-xcg8",
"aliases": [
"CVE-2026-44657"
],
"details": "Using *show_inline=1* parameter and a valid *file_show_inline_token* CSRF token on file_download.php, an attacker can execute code by uploading a crafted XHTML attachment referencing a JavaScript attachment.\n\n### Impact\nCross-site scripting\n\n### Patches\n- 26647b2e68ba30b9d7987d4e03d7a16416684bc2\n\n### Workarounds\nNone\n\n### Credits\nThanks to siunam (Tang Cheuk Hei) for discovering and responsibly reporting the issue.",
"summary": "MantisBT Vulnerable to Stored XSS in File Download",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.28.2"
}
]
}
],
"package": {
"name": "mantisbt/mantisbt",
"ecosystem": "Packagist"
},
"database_specific": {
"last_known_affected_version_range": "<= 2.28.1"
}
}
],
"modified": "2026-06-09T10:24:02Z",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N"
}
],
"published": "2026-05-11T19:40:43Z",
"references": [
{
"url": "https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3",
"type": "WEB"
},
{
"url": "https://github.com/mantisbt/mantisbt/security/advisories/GHSA-p6fr-rxq7-xcg8",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44657",
"type": "ADVISORY"
},
{
"url": "https://github.com/mantisbt/mantisbt/commit/26647b2e68ba30b9d7987d4e03d7a16416684bc2",
"type": "WEB"
},
{
"url": "https://github.com/mantisbt/mantisbt",
"type": "PACKAGE"
},
{
"url": "https://mantisbt.org/bugs/view.php?id=37020",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-79"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": "2026-05-28T21:16:31Z",
"github_reviewed_at": "2026-05-11T19:40:43Z"
}
}