CVE-2026-72724Medium· 4.3▾ Sunlit

Discourse is an open-source discussion platform

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score24/ 100 · Low

impact 23.7 · likelihood 0.1 · exploitation 0

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.

…

Published

Aug 10, 2026

Updated

Sep 8, 2026

CVSS

4.3

Vendor

—

Product

—

CWE

CWE-639

Depth score

24 · Low

EPSS

0.63% · p50

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS history

Exploit-prediction probability, daily snapshots since Sep 8.

0.5% → 0.6%▲ 0.2%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

4 events · 46 days

Aug 10, 2026Published
Disclosed via NVD
Sep 8, 2026Record revised
Last analysed / modified upstream
Sep 8, 2026EPSS first tracked
0.5%
Sep 25, 2026EPSS peak
0.5% → 0.6%

CWE-639 #nvd

Full technical detail▾

Overview

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, plugins/chat/lib/chat/onebox_handler.rb resolves Chat::Thread by route thread_id independently of the route channel_id before checking whether the user can preview the selected chat channel. An authenticated user can pair a public channel ID with a private thread ID in a /onebox.json request and obtain private thread message content. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd

← Back to feed