CVE-2026-43504

Name: CVE-2026-43504
Creator: NVD / NIST
Published: 2026-05-01T15:16:52.38+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.26%

Last modified Jun 17, 2026

CVE-2026-43504 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 0.26% chance of exploitation in the next 30 days.

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 a paused scenario, relaying of unauthenticated traffic can occur.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

EPSS Probability

0.26%

16.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Prosody	Prosody	< 0.12.6
Prosody	Prosody	>= 13.0.0, < 13.0.5

References

https://prosody.im/security/advisory_735dd9d3/Mitigation, Patch, Vendor Advisory
https://www.openwall.com/lists/oss-security/2026/05/01/5Mailing List, Patch, Third Party Advisory

Timeline

Published: May 1, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-43504?

How severe is CVE-2026-43504?

CVE-2026-43504 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.

How do I fix CVE-2026-43504?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-43504?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST