What’s Vulnerable › Vulnerabilities

CVE-2026-72732: Discourse: Templates endpoint exposes hidden tag names

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-10 · updated 2026-09-08
• Weakness: CWE-862

Description

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, the discourse_templates endpoint exposed hidden tag names because DiscourseTemplates::TemplatesSerializer in plugins/discourse-templates/app/serializers/discourse_templates/templates_serializer.rb did not filter tags through the request Guardian. The serializer did not respect tag group permissions, allowing users to see tags they were not permitted to view. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

Affected products

• discourse: before 2026.1.6; from 2026.5.0-latest, < 2026.5.2; from 2026.6.0-latest, < 2026.6.1; from 2026.7.0-latest, < 2026.7.0

References

• https://github.com/discourse/discourse/commit/25e9d55b4c652b8dc1c90f44c40c8f3fec77748c
• https://github.com/discourse/discourse/commit/c9b431b3b75727f7132ec231142371d203a6124b
• https://github.com/discourse/discourse/commit/f216f258bd473e6299c6aef7b6130e7db90116c0
• https://github.com/discourse/discourse/commit/f41e71b645eb60cc263e7a1de22251028115abf1
• https://github.com/discourse/discourse/security/advisories/GHSA-xrgc-52m8-82hm

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