Vulnerability Details CVE-2026-44787
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, the signup flow could allow newly registered users to set primary_group_id and gain whisper-group privileges without legitimate group membership on sites with whispers_allowed_groups configured. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 22.8%
CVSS Severity
CVSS v3 Score 8.2
References
- https://github.com/discourse/discourse/commit/012796ac28c85b30aa233c5ef042fc66efff8126
- https://github.com/discourse/discourse/commit/0f50a07a6ef4b33f3f826ce6d7bf6d7bd16912d8
- https://github.com/discourse/discourse/commit/5418e3027dba109e27a4796463686d61e190ac29
- https://github.com/discourse/discourse/commit/6fc7e6cf04422fc3f9d1c99134803071e983ff0a
- https://github.com/discourse/discourse/releases/tag/v2026.1.5
- https://github.com/discourse/discourse/releases/tag/v2026.4.2
- https://github.com/discourse/discourse/releases/tag/v2026.5.1
- https://github.com/discourse/discourse/releases/tag/v2026.6.0
- https://github.com/discourse/discourse/security/advisories/GHSA-vmwq-jvxx-jwfx
Products affected by CVE-2026-44787
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cpe:2.3:a:discourse:discourse:2026.1.0
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cpe:2.3:a:discourse:discourse:2026.1.1
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cpe:2.3:a:discourse:discourse:2026.1.2
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cpe:2.3:a:discourse:discourse:2026.1.3
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cpe:2.3:a:discourse:discourse:2026.1.4
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cpe:2.3:a:discourse:discourse:2026.4.0
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cpe:2.3:a:discourse:discourse:2026.4.1
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cpe:2.3:a:discourse:discourse:2026.6.0