CVE-2026-36761 — The /Msg/MsgInner/Save Endpoint Of JeeSite Cross-Site Scripting (XSS)

title: CVE-2026-36761 - JeeSite /msg/msgInner/save Stored XSS via msgContent
id: scw-2026-04-30-ai-1
status: experimental
level: high
description: |
  Detects a stored XSS vulnerability in JeeSite v5.15.1 by looking for POST requests to the /msg/msgInner/save endpoint containing a msgContent parameter with common XSS payloads like '<script>', 'alert(', or 'onerror='.
author: SCW Feed Engine (AI-generated)
date: 2026-04-30
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-36761/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      uri|contains:
          - '/msg/msgInner/save'
      cs-method:
          - 'POST'
      cs-uri-query|contains:
          - 'msgContent='
  selection_payload:
      cs-uri-query|contains:
          - '<script>'
          - 'alert('
          - 'onerror='
      condition: selection AND selection_payload
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse