CVE-2026-44786
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk15th percentile - higher than 15% of all known CVEs
Summary
Discourse is an open-source discussion platform with a vulnerability in versions from 2026.1.0 to before 2026.1.4, from 2026.3.0 to before 2026.3.1, and from 2026.4.0 to before 2026.4.1. Chat events for public category channels are published to MessageBus without proper permission scoping, allowing subscribers without chat enabled to receive chat message payloads in real time.
Risk Assessment
The organization may be exposed to the disclosure of private chat messages, potentially leading to privacy violations and loss of trust in the platform.
Recommendation
It is recommended to update Discourse to versions 2026.1.4, 2026.3.1, 2026.4.1, or 2026.5.0-latest.1 to mitigate this vulnerability.
Original NVD description (English source)
Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, chat events for public category channels are published to MessageBus without permission scoping, so any MessageBus subscriber without chat enabled could receive chat message payloads in real time. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.