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User's read state for a topic is leaked when unread state message is published from the server to the clients.

Moderate
tgxworld published GHSA-gq2h-qhg2-phf9 Aug 13, 2021

Package

Discourse

Affected versions

stable <= 2.7.7; beta <= 2.8.0.beta4; tests-passed <= 2.8.0.beta4

Patched versions

stable <= 2.7.8; beta <= 2.8.0.beta5; tests-passed <= 2.8.0.beta5

Description

Impact

A user's read state for a topic such as the last read post number and the notification level is exposed.

Patches

This issue is patched in the latest stable, beta and tests-passed versions of Discourse.

Severity

Moderate
4.3
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CVE ID

CVE-2021-37703

Weaknesses