---
id: CVE-2026-103662
title: >-
  MISP 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 i…
summary: >-
  MISP 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 i…
severity: medium
cvss: 5.1
cvssVector: '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'
cwe:
  - CWE-79
vendor: MISP
product: MISP
affected:
  - MISP < 2.5.48
published: '2026-10-01'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T09:17:08.597'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103662'
references:
  - url: 'https://github.com/MISP/MISP/commit/9619083c8'
    label: 5a6e4751-2f3f-4070-9419-94fb35b644e8
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-01T09:41:14.153Z'
---

## Overview

MISP 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.

## Remediation

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