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. (CVE-2026-43504)
Description
A vulnerability in Prosody versions before 0.12.6 and from 1.0.0 through 13.0.0 before 13.0.5 affects the mod_proxy65 module. The module mishandles access control when paused, allowing unauthenticated traffic to be relayed. This issue has a medium severity rating with a CVSS score of 6.5.
CVSS v3.1
Score 6.5medium
Affected software
pkg:deb/ubuntu/prosody?arch=source&distro=xenialpkg:deb/ubuntu/prosody?arch=source&distro=esm-apps/bionicpkg:deb/ubuntu/prosody?arch=source&distro=focalpkg:deb/ubuntu/prosody?arch=source&distro=jammypkg:deb/ubuntu/prosody?arch=source&distro=noblepkg:deb/ubuntu/prosody?arch=source&distro=questingpkg:deb/ubuntu/prosody?arch=source&distro=stonkingpkg:deb/ubuntu/prosody?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-43504 describes a vulnerability in the Prosody XMPP server affecting versions prior to 0.12.6 and from 1.0.0 up to but excluding 13.0.5 when the mod_proxy65 module is enabled. The flaw arises because mod_proxy65 improperly enforces access control during a paused state, which can lead to the relaying of unauthenticated traffic through the server. This could potentially allow an attacker to misuse the proxy functionality without proper authentication.
Potential Impact
The vulnerability allows unauthenticated traffic to be relayed via the mod_proxy65 module, potentially enabling unauthorized use of the proxy service. The CVSS 3.1 score of 6.5 indicates a medium impact with no confidentiality loss, limited integrity impact, and some availability impact. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available in Prosody versions 0.12.6 and 13.0.5 and later. Users should upgrade to these or newer versions to remediate the vulnerability. Since no vendor advisory content was provided, patch status is inferred from the version ranges stated. No additional mitigation steps are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-43504
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:25.10","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6ad3f6802cdf04f6566671d3
Added to database: 10/17/2026, 22:28:16 UTC
Last enriched: 10/18/2026, 01:37:55 UTC
Last updated: 10/18/2026, 01:37:55 UTC
Views: 5
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