CVE-2026-43505Network attack vector

Unauthenticated traffic relay via missing activation authorization

Published May 1, 2026 · Updated May 1, 2026

Incorrect authorization in mod_proxy65 in Prosody before 0.12.6 and 1.0.0 through 13.0.4 allows remote attackers to relay traffic. The activation path omits the ACL check applied during service discovery, so clients that know the proxy domain and port can skip discovery. The non-default module must be enabled, and both peers must connect and complete SOCKS5 handshakes; the proxy cannot initiate arbitrary outbound connections.

CVSS severity6.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in mod_proxy65 in Prosody before 0.12.6 and 1.0.0 through 13.0.4 allows remote attackers to relay traffic. The activation path omits the ACL check applied during service discovery, so clients that know the proxy domain and port can skip discovery. The non-default module must be enabled, and both peers must connect and complete SOCKS5 handshakes; the proxy cannot initiate arbitrary outbound connections.

The record

CVE
CVE-2026-43505
Published
May 1, 2026
Updated
May 1, 2026
Vendor
Prosody IM
Product
Prosody
Classifications
CWE-863, CWE-420, T1090
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.12.6
  2. Affected versionversion=1.0.0 <13.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Prosody IM · Prosodyversion=0 <0.12.6; version=1.0.0 <13.0.5

Published CVSS scores

5.3Prosody IMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
6.5MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
CWE-420Unprotected Alternate Channel
T1090Proxy

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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