EUVD-2026-13196CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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3Description
Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a lack of visibility checks with a user action API endpoint that results in disclosure of the title and post excerpt to unauthorized users, leading to information disclosure. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
Analysis
Unauthorized information disclosure in Discourse discussion platform versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 allows unauthenticated attackers to view restricted post titles and excerpts through inadequate permission validation on user action API endpoints. The vulnerability affects all deployments running vulnerable versions, with no available workarounds until patching to the fixed releases.
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Remediation
Within 24 hours: Inventory all Discourse instances and document current versions; assess whether affected versions are deployed in production and what data sensitivity exists in your instances. Within 7 days: Contact Discourse support for patch availability confirmation; implement network-level access controls to restrict API endpoint access if running affected versions. …
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