CVE-2026-43504 — Prosody Vulnerability
CVE-2026-43504 — An issue was discovered in Prosody before 0.12.6 and 1.0.0 through 13.0.0 before 13.0.5, when mod_proxy65 is enabled. Because mod_proxy65 mishandles access control in a paused scenario, relaying of unauthenticated traffic can occur.
What This Means For You
- If your environment is affected by CWE-863, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-43504 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-43504: Unauthenticated Traffic Relay via mod_proxy65
title: CVE-2026-43504: Unauthenticated Traffic Relay via mod_proxy65
id: scw-2026-05-01-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit CVE-2026-43504 by identifying unauthenticated traffic being relayed through Prosody's mod_proxy65 on the standard XMPP port (5222). The presence of 'proxy65' in the query string and a successful status code (200) suggests a potential exploitation of the access control mishandling.
author: SCW Feed Engine (AI-generated)
date: 2026-05-01
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-43504/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: proxy
detection:
selection:
dst_port:
- 5222
cs-uri-query|contains:
- 'proxy65'
sc-status:
- 200
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-43504 | vulnerability | CVE-2026-43504 |
| CWE-863 | weakness | CWE-863 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 01, 2026 at 18:16 UTC |
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