CVE-2026-78374

MEDIUMPre-NVD 6.96.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.9 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 76% 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: cna:joomla, epss
Trending — 3 sources updated this week
6.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.9Exploit: None knownExposed: 0

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

Joomla Extension - joomlart.com - Open mail relay via contact AJAX endpoint in T4 Page Builder extension < 2.3.0 - The front-end JSON editor endpoint exposes an action called contact that requires no authentication, no CSRF token, no captcha (when no captcha plugin is enabled) and has no rate limiting. The attacker fully controls the recipient, subject and HTML body, and the mail is sent from the site's configured sender identity (mailfrom/fromname).

CVSS v3
6.9
EG Score
6.9(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity69% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 11, 2026

Advisory Details (1)

Auto-updated Sep 10, 2026
No patch confirmed yet.
generic

T4 Page Builder - The world's leading Joomla page builder | JoomlArt

https://www.joomlart.com/t4-builder/t4-joomla-page-builder

Vendor Advisories for CVE-2026-78374(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 32× 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. 2026-09-19 15:58 UTCEG score recompute
  2. 2026-09-19 15:58 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 14:35 UTCEG score recompute
  5. 2026-09-18 14:35 UTCGHSA enrichment
  6. 2026-09-17 13:12 UTCEG score recompute
  7. 2026-09-17 13:12 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 11:49 UTCEG score recompute
  10. 2026-09-16 11:49 UTCGHSA enrichment
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 10:26 UTCEG score recompute
  13. 2026-09-15 10:26 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 09:03 UTCEG score recompute
  17. 2026-09-14 09:03 UTCGHSA enrichment
  18. 2026-09-13 07:40 UTCEG score recompute
  19. 2026-09-13 07:40 UTCGHSA enrichment
  20. 2026-09-12 06:18 UTCEG score recompute
  21. 2026-09-12 06:18 UTCGHSA enrichment
  22. 2026-09-11 14:53 UTCEPSS rescore
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-11 04:55 UTCEG score recompute
  25. 2026-09-11 04:55 UTCGHSA enrichment
Show 7 more
  1. 2026-09-10 15:18 UTCGHSA enrichment
  2. 2026-09-10 12:19 UTCEG score recompute
  3. 2026-09-10 12:00 UTCEG score recompute
  4. 2026-09-10 10:52 UTCEG score recompute
  5. 2026-09-10 10:38 UTCEG score recompute
  6. 2026-09-10 10:05 UTCEG score recompute
  7. 2026-09-10 10:04 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-78374?
CVE-2026-78374 is a medium vulnerability published on September 10, 2026. Joomla Extension - joomlart.com - Open mail relay via contact AJAX endpoint in T4 Page Builder extension < 2.3.0 - The front-end JSON editor endpoint exposes an action called contact that requires no authentication, no CSRF token, no captcha (when no captcha plugin is enabled) and has no rate…
When was CVE-2026-78374 disclosed?
CVE-2026-78374 was first published in the National Vulnerability Database on September 10, 2026, with the most recent update on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78374 actively exploited?
CVE-2026-78374 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 76.3% of all scored CVEs.
What is the CVSS score of CVE-2026-78374?
CVE-2026-78374 has a CVSS v4.0 base score of 6.9 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-78374?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78374, 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-2026-78374

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