CVE-2026-72724

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 62% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
4.3
EG Score
4.3(medium)
EG Risk
20(Track)
EG Risk 20/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

August 10, 2026

Last Modified

August 11, 2026

Advisory Details (9)

Auto-updated Aug 10, 2026
Patch available. Sources: github_commit, github_pr, github.
github Patch Available

Private Chat Threat Message Disclosure via Chat Onebox Channel/Threat ID Mismatch · Advisory · discourse/discourse · GitHub

https://github.com/discourse/discourse/security/advisories/GHSA-8g98-fvfc-9w48
github_pr

Security fixes for release/2026.6

Fix merged in discourse/discourse PR #42094 on 2026-07-28 — awaiting tagged release

https://github.com/discourse/discourse/pull/42094
github_pr

Security fixes for release/2026.5

Fix merged in discourse/discourse PR #42093 on 2026-07-28 — awaiting tagged release

https://github.com/discourse/discourse/pull/42093
github_pr

Security fixes for release/2026.1

Fix merged in discourse/discourse PR #42092 on 2026-07-28 — awaiting tagged release

https://github.com/discourse/discourse/pull/42092
github_pr

Security fixes for main

Fix merged in discourse/discourse PR #42091 on 2026-07-28 — awaiting tagged release

https://github.com/discourse/discourse/pull/42091
github_commit

commit dc54846f0754 (discourse/discourse)

Fix landed in discourse/discourse commit dc54846f0754 — awaiting tagged release

https://github.com/discourse/discourse/commit/dc54846f0754799591717b6018343e49524e41ce
github_commit

commit 49efe1d7f098 (discourse/discourse)

Fix landed in discourse/discourse commit 49efe1d7f098 — awaiting tagged release

https://github.com/discourse/discourse/commit/49efe1d7f098f2ce7301908815a211cc9248270f
github_commit

commit 45ab6d54076d (discourse/discourse)

Fix landed in discourse/discourse commit 45ab6d54076d — awaiting tagged release

https://github.com/discourse/discourse/commit/45ab6d54076de9ca4965888974d4416d5b48e83c
github_commit

commit 1276d7032af8 (discourse/discourse)

Fix landed in discourse/discourse commit 1276d7032af8 — awaiting tagged release

https://github.com/discourse/discourse/commit/1276d7032af8803956c74ae87ccfd976938dcd75

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 36× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-27 14:25 UTCEPSS rescore
  2. 2026-08-27 10:24 UTCEG score recompute
  3. 2026-08-26 14:47 UTCEPSS rescore
  4. 2026-08-26 09:59 UTCEG score recompute
  5. 2026-08-25 13:49 UTCEPSS rescore
  6. 2026-08-25 09:18 UTCEG score recompute
  7. 2026-08-23 08:25 UTCEG score recompute
  8. 2026-08-23 00:19 UTCEPSS rescore
  9. 2026-08-22 08:01 UTCEG score recompute
  10. 2026-08-21 23:49 UTCEPSS rescore
  11. 2026-08-21 07:36 UTCEG score recompute
  12. 2026-08-20 22:56 UTCEPSS rescore
  13. 2026-08-20 07:11 UTCEG score recompute
  14. 2026-08-19 17:04 UTCEPSS rescore
  15. 2026-08-19 06:47 UTCEG score recompute
  16. 2026-08-18 13:49 UTCEPSS rescore
  17. 2026-08-18 13:49 UTCEPSS rescore
  18. 2026-08-18 06:15 UTCEG score recompute
  19. 2026-08-17 13:47 UTCEPSS rescore
  20. 2026-08-17 05:50 UTCEG score recompute
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 05:25 UTCEG score recompute
  24. 2026-08-16 02:15 UTCEPSS rescore
  25. 2026-08-15 05:01 UTCEG score recompute
Show 11 more
  1. 2026-08-15 01:31 UTCEPSS rescore
  2. 2026-08-14 04:36 UTCEG score recompute
  3. 2026-08-13 22:00 UTCEPSS rescore
  4. 2026-08-13 04:11 UTCEG score recompute
  5. 2026-08-12 13:51 UTCEPSS rescore
  6. 2026-08-12 03:47 UTCEG score recompute
  7. 2026-08-11 03:22 UTCEG score recompute
  8. 2026-08-11 02:18 UTCEG score recompute
  9. 2026-08-10 16:29 UTCEG score recompute
  10. 2026-08-10 16:10 UTCEG score recompute
  11. 2026-08-10 16:09 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-72724?
CVE-2026-72724 is a medium vulnerability published on August 10, 2026. 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/oneboxhandler.rb resolves Chat::Thread by route threadid independently of the route channel_id before checking whether the user can preview the selected chat channel. An…
When was CVE-2026-72724 disclosed?
CVE-2026-72724 was first published in the National Vulnerability Database on August 10, 2026, with the most recent update on August 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-72724 actively exploited?
CVE-2026-72724 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.1% of all scored CVEs.
What is the CVSS score of CVE-2026-72724?
CVE-2026-72724 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-72724?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-72724, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-72724

Explore →

Is Your Infrastructure Affected by CVE-2026-72724?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs