CVE-2026-43505 Missing authorization in Prosody

Medium 6.5 Published 1 May 2026 Updated 1 May 2026

Attackers can relay unauthenticated traffic via the proxy module due to improper access control, requiring the module to be enabled.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-43505?

CVE-2026-43505 is a medium-severity missing authorization vulnerability in Prosody, published on 1 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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 the activation scenario, relaying of unauthenticated traffic can occur.

Weakness: CWE-420

Which versions are affected by CVE-2026-43505?

It affects 1 product.

Products include Prosody Prosody.

How do I fix CVE-2026-43505?

Upgrade to a fixed version.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-43505 being exploited?

There is no known exploitation of CVE-2026-43505 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2026-43505, GHSA-5xq3-jq5p-hcrf, UBUNTU-CVE-2026-43505.