Discourse up to 2026.1.3/2026.3.0/2026.4.0 SMTP Password name/logs.json information disclosure

Summaryinfo

A vulnerability classified as problematic was found in Discourse up to 2026.1.3/2026.3.0/2026.4.0. This issue affects some unknown processing of the file name/logs.json of the component SMTP Password Handler. Such manipulation leads to information disclosure. This vulnerability is listed as CVE-2026-44784. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Discourse up to 2026.1.3/2026.3.0/2026.4.0. Affected by this issue is an unknown function of the file name/logs.json of the component SMTP Password Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, group owners who are not necessarily admins or moderators can view a group's outgoing email/SMTP credentials in plaintext via the group history log (/groups/:name/logs.json). Affected fields: email_password, email_username, smtp_server, smtp_port, smtp_ssl_mode. The most sensitive item is the SMTP password, which an owner could use to send mail as the group from outside Discourse. This impacts sites that have configured per-group SMTP credentials and granted group ownership to users who should not have access to those credentials. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-44784 since 05/07/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

By approaching the search of inurl:name/logs.json it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2026.1.4, 2026.3.1 or 2026.4.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-36587). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Chat Software

Name

• Discourse

Version

• 2026.0
• 2026.1
• 2026.1.0
• 2026.1.1
• 2026.1.2
• 2026.1.3
• 2026.2
• 2026.3
• 2026.3.0
• 2026.4.0

License

• open-source

Website

• Product: https://github.com/discourse/discourse/

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Once again VulDB remains the best source for vulnerability data.

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