Access Control Vulnerability in Prosody Messaging Server by Prosody Software
CVE-2026-43504

6.5MEDIUM

Key Information:

Vendor

Prosody

Status
Prosody
Vendor
CVE Published:
1 May 2026

What is CVE-2026-43504?

An access control vulnerability has been identified in Prosody messaging server versions before 0.12.6 and from version 1.0.0 to 13.0.0 before 13.0.5, specifically when mod_proxy65 is enabled. This issue occurs due to mishandling of access control during a paused state, which can inadvertently allow the relaying of unauthenticated traffic. Administrators are advised to update to the latest version to mitigate potential exploitation.

Affected Version(s)

Prosody 0 < 0.12.6

Prosody 1.0.0 < 13.0.5

References

https://www.openwall.com/lists/oss-security/2026/05/01/5
https://prosody.im/security/advisory_735dd9d3/

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.