---
id: CVE-2020-8891
title: An issue was discovered in MISP before 2.4.121
summary: >-
  An issue was discovered in MISP before 2.4.121. It did not canonicalize
  usernames when trying to block a brute-force series of invalid requests.
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'
vendor: misp-project
product: misp
affected:
  - misp < 2.4.121
patched:
  - misp 2.4.121
published: '2020-02-12'
updated: '2026-06-22'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-8891'
references:
  - url: >-
      https://github.com/MISP/MISP/commit/934c82819237b4edf1da64587b72a87bec5dd520
    label: cve@mitre.org
  - url: >-
      https://github.com/MISP/MISP/commit/c1a0b3b2809b21b4df8c1efbc803aff700e262c3
    label: cve@mitre.org
  - url: 'https://github.com/MISP/MISP/compare/v2.4.120...v2.4.121'
    label: cve@mitre.org
  - url: >-
      https://github.com/MISP/MISP/commit/934c82819237b4edf1da64587b72a87bec5dd520
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/MISP/MISP/commit/c1a0b3b2809b21b4df8c1efbc803aff700e262c3
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/MISP/MISP/compare/v2.4.120...v2.4.121'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.0143
epssPercentile: 0.71892
ingestedAt: '2026-06-29T13:24:33.237Z'
---

## Overview

An issue was discovered in MISP before 2.4.121. It did not canonicalize usernames when trying to block a brute-force series of invalid requests.

## Affected

- `misp < 2.4.121`

## Remediation

Upgrade past the affected range:

- `misp 2.4.121`