CVE-2026-43504

MEDIUMNVD 6.56.5—

6.5

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.

CVSS v3: 6.5
EG Score: 6.5(high)
EPSS: 5.8%
KEV: Not listed

Published

May 1, 2026

Last Modified

May 1, 2026

Advisory Details (2)

Auto-updated May 1, 2026

🔬 Proof of concept available. No patch confirmed yet.

generic🟡 PoC Available

oss-security - Prosody XMPP server security advisory 2026-04-31 (multiple vulnerabilities)

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

generic🟡 PoC Available

Prosody XMPP server advisory 2026-04-29 (Multiple Vulnerabilities)

https://prosody.im/security/advisory_735dd9d3/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-863Incorrect Authorization

Data Freshness Timeline

(refreshed 12× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-21 22:43 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 14:49 UTCEG score recompute
2026-05-20 14:49 UTCGHSA enrichment
2026-05-20 11:22 UTCepss_batch

Frequently asked(5)

What is CVE-2026-43504?

CVE-2026-43504 is a medium vulnerability published on May 1, 2026. An issue was discovered in Prosody before 0.12.6 and 1.0.0 through 13.0.0 before 13.0.5, when modproxy65 is enabled. Because modproxy65 mishandles access control in a paused scenario, relaying of unauthenticated traffic can occur.

When was CVE-2026-43504 disclosed?

CVE-2026-43504 was first published in the National Vulnerability Database on May 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-43504 actively exploited?

CVE-2026-43504 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-43504?

CVE-2026-43504 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2026-43504?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43504, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-43504

📅 Published

🔄 Last Modified

📋 Advisory Details (2)