Discourse: Chat MessageBus delivers read-restricted messages to unauthorized users
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| discourse | discourse | affected |
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No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.482% probability within 30 days)
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ssvc
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| First Time appeared |
Discourse
Discourse discourse |
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Discourse
Discourse discourse |
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| Description | Discourse is an open-source discussion platform. Prior to 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9, MessageBus audience calculation could deliver messages from a read-restricted category chat channel to an authenticated user who could view the category but was not allowed to use Chat under the site's group restrictions. The publication path bounded events by category visibility without also enforcing Chat eligibility, exposing live and recent message content available in the MessageBus backlog. The issue does not permit retrieval of the channel's full history through the Chat API and does not permit message creation or modification. This issue is fixed in versions 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9. | |
| Title | Discourse: Chat MessageBus delivers read-restricted messages to unauthorized users | |
| Weaknesses | CWE-862 | |
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| Metrics |
cvssV3_1
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