GHSA-P9M5-XWGX-8J69
Vulnerability from github – Published: 2026-10-01 09:30 – Updated: 2026-10-01 09:30MISP contains a reflected cross-site scripting (XSS) vulnerability in the legacy taxonomy tag management confirmation forms (add tag and disable tag).
The affected forms echoed a user-supplied tag name value from the request unescaped into the rendered HTML output. An attacker who can induce a site administrator to visit a crafted URL containing a malicious tag name parameter can execute arbitrary JavaScript in the administrator's browser session.
Preconditions:
-
The target must be running a MISP instance with the legacy taxonomy tag confirmation views enabled.
-
The victim must be an authenticated site administrator.
-
The victim must navigate to the attacker-crafted URL (e.g., via a phishing link).
Security impact:
-
Execution of arbitrary client-side script in the context of the administrator's browser.
-
Potential theft of session tokens, CSRF tokens, or other sensitive data accessible from the page.
-
Potential for performing privileged actions on behalf of the administrator within the MISP interface.
Affected versions: <2.5.48.
{
"affected": [],
"aliases": [
"CVE-2026-103662"
],
"database_specific": {
"cwe_ids": [
"CWE-79"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-01T09:17:08Z",
"severity": "MODERATE"
},
"details": "MISP contains a reflected cross-site scripting (XSS) vulnerability in the legacy taxonomy tag management confirmation forms (add tag and disable tag).\n\nThe affected forms echoed a user-supplied tag name value from the request unescaped into the rendered HTML output. An attacker who can induce a site administrator to visit a crafted URL containing a malicious tag name parameter can execute arbitrary JavaScript in the administrator\u0027s browser session.\n\nPreconditions:\n\n- The target must be running a MISP instance with the legacy taxonomy tag confirmation views enabled.\n\n- The victim must be an authenticated site administrator.\n\n- The victim must navigate to the attacker-crafted URL (e.g., via a phishing link).\n\nSecurity impact:\n\n- Execution of arbitrary client-side script in the context of the administrator\u0027s browser.\n\n- Potential theft of session tokens, CSRF tokens, or other sensitive data accessible from the page.\n\n- Potential for performing privileged actions on behalf of the administrator within the MISP interface.\n\nAffected versions: \u003c2.5.48.",
"id": "GHSA-p9m5-xwgx-8j69",
"modified": "2026-10-01T09:30:35Z",
"published": "2026-10-01T09:30:35Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103662"
},
{
"type": "WEB",
"url": "https://github.com/MISP/MISP/commit/9619083c8"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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