GHSA-2HXJ-RRWR-5G5V
Vulnerability from github – Published: 2026-10-01 09:30 – Updated: 2026-10-01 09:30MISP contains a vulnerability in its two-factor authentication (TOTP) verification process that permits a valid one-time code to be accepted more than once within its time-based validity window.
The issue exists in the user login flow where a TOTP code is verified as a second authentication factor. Because the system did not record whether a given TOTP period had already been consumed, the same code remained valid for its entire time window (typically 30 seconds). An attacker who captures a legitimate code during a user's login could replay it to authenticate a second session as that user.
Preconditions:
-
The target user has TOTP-based two-factor authentication enabled.
-
The attacker is in a position to observe or intercept the TOTP code during a legitimate login (e.g., network-level interception, shoulder surfing, or a compromised client).
-
The replay must occur within the TOTP validity period.
Security impact:
-
Unauthorized account access by replaying a captured one-time code.
-
Potential compromise of threat-intelligence data and administrative functions accessible to the targeted user.
Affected versions: <v2.5.48.
{
"affected": [],
"aliases": [
"CVE-2026-103655"
],
"database_specific": {
"cwe_ids": [
"CWE-294"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-01T09:17:07Z",
"severity": "CRITICAL"
},
"details": "MISP contains a vulnerability in its two-factor authentication (TOTP) verification process that permits a valid one-time code to be accepted more than once within its time-based validity window.\n\nThe issue exists in the user login flow where a TOTP code is verified as a second authentication factor. Because the system did not record whether a given TOTP period had already been consumed, the same code remained valid for its entire time window (typically 30 seconds). An attacker who captures a legitimate code during a user\u0027s login could replay it to authenticate a second session as that user.\n\nPreconditions:\n\n- The target user has TOTP-based two-factor authentication enabled.\n\n- The attacker is in a position to observe or intercept the TOTP code during a legitimate login (e.g., network-level interception, shoulder surfing, or a compromised client).\n\n- The replay must occur within the TOTP validity period.\n\nSecurity impact:\n\n- Unauthorized account access by replaying a captured one-time code.\n\n- Potential compromise of threat-intelligence data and administrative functions accessible to the targeted user.\n\nAffected versions: \u003cv2.5.48.",
"id": "GHSA-2hxj-rrwr-5g5v",
"modified": "2026-10-01T09:30:35Z",
"published": "2026-10-01T09:30:35Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103655"
},
{
"type": "WEB",
"url": "https://github.com/MISP/MISP/commit/a020fa47b"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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"
}
]
}
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