CVE-2026-72724

MEDIUMPre-NVD 4.34.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 4.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (48th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
4.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 4.3Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

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
4.3MEDIUMmedium confidence
EG Risk
20
EG Risk 20/100

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 (value × EchelonGraph’s weight)
Severity43% × 45%
The EG Score, 4.3 of 10.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
48th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

The CVE record names the fixed release. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 10, 2026

Last Modified

September 8, 2026

Advisory Details (9)

Auto-updated Aug 10, 2026
Fix named in the CVE record. Sources: github_commit, github_pr, github.
GitHub advisoryMentions a patch (unverified)

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 pull request

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 pull request

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 pull request

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 pull request

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 12× in last 7d / 41× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 96 of 99 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 4 repeat rows among the latest 100 are merged into the row they repeat. The 3 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  2. 2026-10-12 15:41 UTCEG score recompute
  3. 2026-10-11 19:27 UTCEG score recompute
  4. 2026-10-11 16:42 UTCEG score recompute
  5. 2026-10-11 14:02 UTCEG score recompute
  6. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  9. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  10. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  11. 2026-10-06 18:21 UTCEG score recompute
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  14. 2026-10-05 07:47 UTCEG score recompute
  15. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  16. 2026-10-04 04:25 UTCEG score recompute
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  18. 2026-10-02 09:19 UTCEG score recompute
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  20. 2026-09-30 22:36 UTCEG score recompute
  21. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  22. 2026-09-28 13:10 UTCEG score recompute
  23. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  24. 2026-09-27 12:45 UTCEG score recompute
  25. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 47th percentile
Show 71 more
  1. 2026-09-24 12:41 UTCEG score recompute
  2. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  3. 2026-09-23 12:09 UTCEG score recompute
  4. 2026-09-22 11:45 UTCEG score recompute
  5. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  6. 2026-09-20 10:48 UTCEG score recompute
  7. 2026-09-19 06:22 UTCEG score recompute
  8. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  9. 2026-09-18 05:57 UTCEG score recompute
  10. 2026-09-17 05:33 UTCEG score recompute
  11. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  12. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  13. 2026-09-15 04:28 UTCEG score recompute
  14. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  15. 2026-09-14 03:41 UTCEG score recompute
  16. 2026-09-13 03:17 UTCEG score recompute
  17. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  18. 2026-09-12 02:51 UTCEG score recompute
  19. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  20. 2026-09-11 02:26 UTCEG score recompute
  21. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  22. 2026-09-10 02:01 UTCEG score recompute
  23. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  24. 2026-09-07 17:17 UTCEG score recompute
  25. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  26. 2026-09-06 04:09 UTCEG score recompute
  27. 2026-09-05 03:45 UTCEG score recompute
  28. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  29. 2026-09-03 02:30 UTCEG score recompute
  30. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  31. 2026-09-01 22:36 UTCEG score recompute
  32. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  33. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  34. 2026-08-31 22:11 UTCEG score recompute
  35. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  36. 2026-08-30 15:45 UTCEG score recompute
  37. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  38. 2026-08-29 15:20 UTCEG score recompute
  39. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  40. 2026-08-28 11:40 UTCEG score recompute
  41. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  42. 2026-08-27 10:24 UTCEG score recompute
  43. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  44. 2026-08-26 09:59 UTCEG score recompute
  45. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  46. 2026-08-25 09:18 UTCEG score recompute
  47. 2026-08-23 08:25 UTCEG score recompute
  48. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  49. 2026-08-22 08:01 UTCEG score recompute
  50. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  51. 2026-08-21 07:36 UTCEG score recompute
  52. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  53. 2026-08-20 07:11 UTCEG score recompute
  54. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  55. 2026-08-19 06:47 UTCEG score recompute
  56. 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  57. 2026-08-18 06:15 UTCEG score recompute
  58. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  59. 2026-08-17 05:50 UTCEG score recompute
  60. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  61. 2026-08-16 05:25 UTCEG score recompute
  62. 2026-08-16 02:15 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  63. 2026-08-15 05:01 UTCEG score recompute
  64. 2026-08-15 01:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  65. 2026-08-14 04:36 UTCEG score recompute
  66. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  67. 2026-08-13 04:11 UTCEG score recompute
  68. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  69. 2026-08-12 03:47 UTCEG score recompute
  70. 2026-08-11 03:22 UTCEG score recompute
  71. 2026-08-11 02:18 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-72724?
CVE-2026-72724 is a medium-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-72724 published?
The CVE record for CVE-2026-72724 was published on August 10, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 8, 2026; the record at its source may have been updated since.
Is CVE-2026-72724 actively exploited?
CVE-2026-72724 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-72724?
CVE-2026-72724 has a CVSS base score of 4.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-72724?
The CVE record for CVE-2026-72724 names the fix: "This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0."

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