CVE-2026-72724Discourse: Private Chat Threat Message Disclosure via Chat Onebox Channel/Threat ID Mismatch
Updated under an hour ago ()
Does this affect you?
It affects discourse. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-639
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Aug 11, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
discourse discourse discourse:discourse (from the name) | before 2026.1.6; from 2026.5.0-latest, < 2026.5.2; from 2026.6.0-latest, < 2026.6.1; from 2026.7.0-latest, < 2026.7.0 | CNA record |
References
- https://github.com/discourse/discourse/security/advisories/GHSA-8g98-fvfc-9w48x-refsource-confirm
- https://github.com/discourse/discourse/pull/42091x-refsource-misc
- https://github.com/discourse/discourse/pull/42092x-refsource-misc
- https://github.com/discourse/discourse/pull/42093x-refsource-misc
- https://github.com/discourse/discourse/pull/42094x-refsource-misc
- https://github.com/discourse/discourse/commit/1276d7032af8803956c74ae87ccfd976938dcd75x-refsource-misc
- https://github.com/discourse/discourse/commit/45ab6d54076de9ca4965888974d4416d5b48e83cx-refsource-misc
- https://github.com/discourse/discourse/commit/49efe1d7f098f2ce7301908815a211cc9248270fx-refsource-misc
- https://github.com/discourse/discourse/commit/dc54846f0754799591717b6018343e49524e41cex-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.