CVE-2025-58055: discourse Access Control Flaw — Fix

Description

Discourse is an open-source community discussion platform. In versions 3.5.0 and below, the Discourse AI suggestion endpoints for topic “Title”, “Category”, and “Tags” allowed authenticated users to extract information about topics that they weren’t authorized to access. By modifying the “topic_id” value in API requests to the AI suggestion endpoints, users could target specific restricted topics. The AI model’s responses then disclosed information that the authenticated user couldn’t normally access. This issue is fixed in version 3.5.1. To workaround this issue, users can restrict group access to the AI helper feature through the "composer_ai_helper_allowed_groups" and "post_ai_helper_allowed_groups" site settings.

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CVSS v3.1 Score

4.3

MEDIUM

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

Weakness Type (CWE)

CWE-284 CWE-284

CWE-639 CWE-639

Affected Products

Vendor	Product	Versions
discourse	discourse	< 3.5.1
discourse	discourse	< 3.6.0
discourse	discourse	All

References

Advisories & Patches

https://github.com/discourse/discourse/commit/28d569cae9b33cd55d647bf41806106e33d975c9 https://github.com/discourse/discourse/security/advisories/GHSA-32v2-x274-vfhr

Other References

https://www.vicarius.io/vsociety/posts/cve-2025-58055-detect-discourse-vulnerability https://www.vicarius.io/vsociety/posts/cve-2025-58055-mitigate-discourse-vulnerability

Frequently Asked Questions

What is CVE-2025-58055? +

Discourse is an open-source community discussion platform. In versions 3.5.0 and below, the Discourse AI suggestion endpoints for topic “Title”, “Category”, and “Tags” allowed authenticated users to extract information about topics that they weren’t authorized to access. By modifying the “topic_id” value in API requests to the AI suggestion endpoints, users could target specific restricted topics. The AI model’s responses then disclosed information that the authenticated user couldn’t normally access. This issue is fixed in version 3.5.1. To workaround this issue, users can restrict group access to the AI helper feature through the "composer_ai_helper_allowed_groups" and "post_ai_helper_allowed_groups" site settings. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2025-58055? +

CVE-2025-58055 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-58055? +

CVE-2025-58055 affects products from discourse, specifically: discourse. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-58055? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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