---
id: CVE-2026-103655
title: >-
  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.


  The issue exists in the user login flow w…
summary: >-
  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.


  The issue exists in the user login flow w…
severity: critical
cvss: 9.3
cvssVector: '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'
cwe:
  - CWE-294
vendor: MISP
product: MISP
affected:
  - MISP < 2.5.48
published: '2026-10-01'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T09:17:07.993'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103655'
references:
  - url: 'https://github.com/MISP/MISP/commit/a020fa47b'
    label: 5a6e4751-2f3f-4070-9419-94fb35b644e8
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-01T08:40:11.742Z'
---

## Overview

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.

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.