CVE-2026-72720

MEDIUMPre-NVD 6.46.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 78% 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
6.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.4Exploit: 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 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1, Discourse has HTML injection in PrettyText.format_for_email because cooked attribute values are reparsed as markup. Crafted Vimeo iframe sources, secure-upload URLs or dimensions, and hashtag data-slug values can cause decoded attribute text to be reinterpreted as HTML. The vulnerable conversion also fails to strictly validate the Vimeo iframe host and path, allowing non-Vimeo allowlisted iframes to be converted. This issue is fixed in versions 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1.

CVSS v3
6.4
EG Score
6.4(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity64% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

August 10, 2026

Last Modified

August 10, 2026

Advisory Details (9)

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

HTML injection in PrettyText.format_for_email from cooked-attribute reparsing · Advisory · discourse/discourse · GitHub

https://github.com/discourse/discourse/security/advisories/GHSA-3q6f-6gm9-m35v
github_pr

Security fixes for release/2026.1

Fix merged in discourse/discourse PR #42247 on 2026-07-31 — awaiting tagged release

https://github.com/discourse/discourse/pull/42247
github_pr

Security fixes for release/2026.6

Fix merged in discourse/discourse PR #42246 on 2026-07-31 — awaiting tagged release

https://github.com/discourse/discourse/pull/42246
github_pr

Security fixes for release/2026.7

Fix merged in discourse/discourse PR #42245 on 2026-07-31 — awaiting tagged release

https://github.com/discourse/discourse/pull/42245
github_pr

Security fixes for main

Fix merged in discourse/discourse PR #42244 on 2026-07-31 — awaiting tagged release

https://github.com/discourse/discourse/pull/42244
github_commit

commit b25a074b1652 (discourse/discourse)

Fix landed in discourse/discourse commit b25a074b1652 — awaiting tagged release

https://github.com/discourse/discourse/commit/b25a074b165253e01fc4c8911b980fc68338ea16
github_commit

commit a5d3b112d598 (discourse/discourse)

Fix landed in discourse/discourse commit a5d3b112d598 — awaiting tagged release

https://github.com/discourse/discourse/commit/a5d3b112d598242c1d1803d5a77bf98d5fdabd75
github_commit

commit 4b639a52f47f (discourse/discourse)

Fix landed in discourse/discourse commit 4b639a52f47f — awaiting tagged release

https://github.com/discourse/discourse/commit/4b639a52f47fb3d46093bece9df147e4e9517a11
github_commit

commit 234ee88a5b9b (discourse/discourse)

Fix landed in discourse/discourse commit 234ee88a5b9b — awaiting tagged release

https://github.com/discourse/discourse/commit/234ee88a5b9b53bf938c53351eab20130323485f

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 40× 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. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 09:58 UTCEG score recompute
  3. 2026-08-28 21:42 UTCEPSS rescore
  4. 2026-08-28 11:40 UTCEG score recompute
  5. 2026-08-27 14:25 UTCEPSS rescore
  6. 2026-08-27 08:53 UTCEG score recompute
  7. 2026-08-26 14:47 UTCEPSS rescore
  8. 2026-08-26 10:49 UTCEG score recompute
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-24 14:40 UTCEG score recompute
  11. 2026-08-23 16:34 UTCEG score recompute
  12. 2026-08-23 00:19 UTCEPSS rescore
  13. 2026-08-22 18:30 UTCEG score recompute
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-21 20:25 UTCEG score recompute
  16. 2026-08-20 22:56 UTCEPSS rescore
  17. 2026-08-20 00:17 UTCEG score recompute
  18. 2026-08-19 17:04 UTCEPSS rescore
  19. 2026-08-19 02:13 UTCEG score recompute
  20. 2026-08-18 13:49 UTCEPSS rescore
  21. 2026-08-18 13:49 UTCEPSS rescore
  22. 2026-08-18 04:09 UTCEG score recompute
  23. 2026-08-17 13:47 UTCEPSS rescore
  24. 2026-08-17 06:02 UTCEG score recompute
  25. 2026-08-16 14:56 UTCEPSS rescore
Show 15 more
  1. 2026-08-16 14:56 UTCEPSS rescore
  2. 2026-08-16 07:51 UTCEG score recompute
  3. 2026-08-16 02:15 UTCEPSS rescore
  4. 2026-08-15 09:48 UTCEG score recompute
  5. 2026-08-15 01:31 UTCEPSS rescore
  6. 2026-08-14 11:43 UTCEG score recompute
  7. 2026-08-13 22:00 UTCEPSS rescore
  8. 2026-08-12 15:35 UTCEG score recompute
  9. 2026-08-12 13:51 UTCEPSS rescore
  10. 2026-08-11 17:31 UTCEG score recompute
  11. 2026-08-10 19:27 UTCEG score recompute
  12. 2026-08-10 18:35 UTCEG score recompute
  13. 2026-08-10 16:29 UTCEG score recompute
  14. 2026-08-10 16:10 UTCEG score recompute
  15. 2026-08-10 16:09 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-72720?
CVE-2026-72720 is a medium vulnerability published on August 10, 2026. Discourse is an open-source discussion platform. Prior to 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1, Discourse has HTML injection in PrettyText.formatforemail because cooked attribute values are reparsed as markup. Crafted Vimeo iframe sources, secure-upload URLs or dimensions, and…
When was CVE-2026-72720 disclosed?
CVE-2026-72720 was first published in the National Vulnerability Database on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-72720 actively exploited?
CVE-2026-72720 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 78.0% of all scored CVEs.
What is the CVSS score of CVE-2026-72720?
CVE-2026-72720 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2026-72720?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-72720, 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

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