CVE-2026-59829

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: 0.2%, top 87% 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 2026.7.1, on sites with category group moderation enabled, the review queue could include an excerpt (and permalink) of the private message attached to a flag, even when the reviewing category moderator was not a participant in that message. These notify_moderators flag messages are addressed only to moderators and, for core flags, to a category's moderation groups as they existed when the flag was raised, so a category group moderator could read flag-discussion content they were not authorized to see. This affects official plugins that create such messages and core flags raised before a moderator's group was granted moderation of the category. Only the confidentiality of a limited excerpt of these flag-related private messages is affected; no content can be modified or deleted. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.1.

CVSS v3
4.3
EG Score
4.3(medium)
EG Risk
19(Track)
EG Risk 19/100SSVC: 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
13%
KEV
Not listed

Published

August 17, 2026

Last Modified

August 17, 2026

Advisory Details (6)

Auto-updated Aug 17, 2026
Patch available. Sources: github_commit, github_pr, github.
github Patch Available

Review queue exposes flag-related private message excerpts to category group moderators · Advisory · discourse/discourse · GitHub

https://github.com/discourse/discourse/security/advisories/GHSA-wmc6-pmxp-xw5w
github_pr Patch Available

SECURITY: Reviewable conversations expose post-voting flag PM excerpts to category moderators outside the PM

Patch available: discourse/discourse _gh-attach-assets (PR #41527 merged 2026-07-07)

https://github.com/discourse/discourse/pull/41527
github_commit Patch Available

commit e56bd3ec58ae (discourse/discourse)

Patch available: discourse/discourse _gh-attach-assets (contains commit e56bd3ec58ae)

https://github.com/discourse/discourse/commit/e56bd3ec58ae387946220821d1ce214eed02d1b9
github_commit

commit 74c8522a1976 (discourse/discourse)

Fix landed in discourse/discourse commit 74c8522a1976 — awaiting tagged release

https://github.com/discourse/discourse/commit/74c8522a197658c69b0adefa182f601ce85dcefa
github_commit

commit 58e45dc7c92d (discourse/discourse)

Fix landed in discourse/discourse commit 58e45dc7c92d — awaiting tagged release

https://github.com/discourse/discourse/commit/58e45dc7c92d19d5294c73fbcd3833c73dc51754
github_commit

commit 4df0e54f5936 (discourse/discourse)

Fix landed in discourse/discourse commit 4df0e54f5936 — awaiting tagged release

https://github.com/discourse/discourse/commit/4df0e54f59361c78606b578ad12a2c39b4dd9f59

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 25× 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. 2026-08-29 05:38 UTCEG score recompute
  2. 2026-08-28 21:42 UTCEPSS rescore
  3. 2026-08-28 04:25 UTCEG score recompute
  4. 2026-08-27 14:25 UTCEPSS rescore
  5. 2026-08-27 05:43 UTCEG score recompute
  6. 2026-08-26 14:46 UTCEPSS rescore
  7. 2026-08-26 07:02 UTCEG score recompute
  8. 2026-08-25 13:49 UTCEPSS rescore
  9. 2026-08-25 08:25 UTCEG score recompute
  10. 2026-08-24 09:40 UTCEG score recompute
  11. 2026-08-23 11:04 UTCEG score recompute
  12. 2026-08-23 00:19 UTCEPSS rescore
  13. 2026-08-22 12:29 UTCEG score recompute
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-21 13:53 UTCEG score recompute
  16. 2026-08-20 22:55 UTCEPSS rescore
  17. 2026-08-20 15:17 UTCEG score recompute
  18. 2026-08-19 17:04 UTCEPSS rescore
  19. 2026-08-18 18:05 UTCEG score recompute
  20. 2026-08-18 13:48 UTCEPSS rescore
  21. 2026-08-17 19:27 UTCEG score recompute
  22. 2026-08-17 19:12 UTCEG score recompute
  23. 2026-08-17 16:22 UTCEG score recompute
  24. 2026-08-17 16:10 UTCEG score recompute
  25. 2026-08-17 16:09 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-59829?
CVE-2026-59829 is a medium vulnerability published on August 17, 2026. Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.1, on sites with category group moderation enabled, the review queue could include an excerpt (and permalink) of the private message attached to a flag, even when the reviewing category moderator was…
When was CVE-2026-59829 disclosed?
CVE-2026-59829 was first published in the National Vulnerability Database on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59829 actively exploited?
CVE-2026-59829 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 86.7% of all scored CVEs.
What is the CVSS score of CVE-2026-59829?
CVE-2026-59829 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-59829?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59829, 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.

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