CVE-2026-78006

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-12. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

The The Events Calendar plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 6.17.4 via the is_safe_widget_instance function. This is due to insufficient protection in is_safe_widget_instance, which can be bypassed because PHP fires magic methods during its pre-parse, combined with enable_rendering_widget_copied() forging a valid wp_hash integrity attribute before unserialize() is reached. This makes it possible for unauthenticated attackers to execute code on the server. This is exploitable without authentication or approval because the plugin's V2 single-event template runs do_blocks() over buffered comment HTML, and WordPress returns a moderation-hash URL that allows an unauthenticated commenter to immediately view their own pending comment, delivering the injected block markup to the vulnerable code path before any moderation occurs. This does require comments to be enabled and visible on events.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
75(Track)
EG Risk 75/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
54%
KEV
Not listed

Published

September 12, 2026

Last Modified

September 14, 2026

References (7)

Vendor Advisories for CVE-2026-78006(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 62× in last 7d / 75× 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. 2026-09-20 14:19 UTCGHSA enrichment
  2. 2026-09-20 10:39 UTCGHSA enrichment
  3. 2026-09-20 06:59 UTCGHSA enrichment
  4. 2026-09-20 03:12 UTCGHSA enrichment
  5. 2026-09-19 23:33 UTCGHSA enrichment
  6. 2026-09-19 19:53 UTCGHSA enrichment
  7. 2026-09-19 16:13 UTCEG score recompute
  8. 2026-09-19 16:13 UTCGHSA enrichment
  9. 2026-09-19 12:33 UTCGHSA enrichment
  10. 2026-09-19 08:53 UTCGHSA enrichment
  11. 2026-09-19 05:13 UTCGHSA enrichment
  12. 2026-09-19 01:33 UTCGHSA enrichment
  13. 2026-09-18 21:54 UTCEG score recompute
  14. 2026-09-18 21:54 UTCGHSA enrichment
  15. 2026-09-18 19:28 UTCEPSS rescore
  16. 2026-09-18 18:14 UTCGHSA enrichment
  17. 2026-09-18 14:31 UTCGHSA enrichment
  18. 2026-09-18 10:51 UTCGHSA enrichment
  19. 2026-09-18 07:12 UTCGHSA enrichment
  20. 2026-09-18 03:32 UTCGHSA enrichment
  21. 2026-09-17 23:52 UTCGHSA enrichment
  22. 2026-09-17 19:40 UTCEG score recompute
  23. 2026-09-17 19:40 UTCGHSA enrichment
  24. 2026-09-17 16:00 UTCGHSA enrichment
  25. 2026-09-17 12:20 UTCGHSA enrichment
Show 50 more
  1. 2026-09-17 08:40 UTCGHSA enrichment
  2. 2026-09-17 05:00 UTCGHSA enrichment
  3. 2026-09-17 01:20 UTCGHSA enrichment
  4. 2026-09-16 21:40 UTCGHSA enrichment
  5. 2026-09-16 17:58 UTCEG score recompute
  6. 2026-09-16 17:58 UTCGHSA enrichment
  7. 2026-09-16 14:08 UTCEPSS rescore
  8. 2026-09-16 12:46 UTCGHSA enrichment
  9. 2026-09-16 09:06 UTCGHSA enrichment
  10. 2026-09-16 05:27 UTCEG score recompute
  11. 2026-09-16 05:27 UTCGHSA enrichment
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-16 01:47 UTCGHSA enrichment
  14. 2026-09-15 22:06 UTCGHSA enrichment
  15. 2026-09-15 18:26 UTCGHSA enrichment
  16. 2026-09-15 14:46 UTCGHSA enrichment
  17. 2026-09-15 11:06 UTCGHSA enrichment
  18. 2026-09-15 07:26 UTCGHSA enrichment
  19. 2026-09-15 03:47 UTCEG score recompute
  20. 2026-09-15 03:46 UTCGHSA enrichment
  21. 2026-09-15 03:12 UTCEPSS rescore
  22. 2026-09-15 03:12 UTCEPSS rescore
  23. 2026-09-15 00:06 UTCGHSA enrichment
  24. 2026-09-14 20:27 UTCEG score recompute
  25. 2026-09-14 20:27 UTCGHSA enrichment
  26. 2026-09-14 19:30 UTCEG score recompute
  27. 2026-09-14 19:30 UTCGHSA enrichment
  28. 2026-09-14 18:09 UTCGHSA enrichment
  29. 2026-09-14 13:58 UTCEG score recompute
  30. 2026-09-14 13:58 UTCGHSA enrichment
  31. 2026-09-14 11:39 UTCGHSA enrichment
  32. 2026-09-14 07:59 UTCGHSA enrichment
  33. 2026-09-14 04:20 UTCGHSA enrichment
  34. 2026-09-14 00:40 UTCGHSA enrichment
  35. 2026-09-13 21:01 UTCGHSA enrichment
  36. 2026-09-13 17:21 UTCEG score recompute
  37. 2026-09-13 17:21 UTCGHSA enrichment
  38. 2026-09-13 13:41 UTCGHSA enrichment
  39. 2026-09-13 10:02 UTCGHSA enrichment
  40. 2026-09-13 06:22 UTCGHSA enrichment
  41. 2026-09-13 02:43 UTCGHSA enrichment
  42. 2026-09-12 23:03 UTCGHSA enrichment
  43. 2026-09-12 19:23 UTCGHSA enrichment
  44. 2026-09-12 15:43 UTCEG score recompute
  45. 2026-09-12 15:43 UTCGHSA enrichment
  46. 2026-09-12 12:03 UTCEG score recompute
  47. 2026-09-12 12:03 UTCGHSA enrichment
  48. 2026-09-12 08:23 UTCEG score recompute
  49. 2026-09-12 07:44 UTCEG score recompute
  50. 2026-09-12 07:43 UTCMITRE cvelistV5first tracked

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCDeadExpl0it/CVE-2026-78006-POC
    First seen Sep 12, 2026

    POC for CVE-2026-78006 The Events Calendar <= 6.17.4 - Unauthenticated PHP Object Injection to Remote Code Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78006?
CVE-2026-78006 is a critical vulnerability published on September 12, 2026. The The Events Calendar plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 6.17.4 via the issafewidgetinstance function. This is due to insufficient protection in issafewidgetinstance, which can be bypassed because PHP fires magic methods during its…
When was CVE-2026-78006 disclosed?
CVE-2026-78006 was first published in the National Vulnerability Database on September 12, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78006 actively exploited?
CVE-2026-78006 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 45.7% of all scored CVEs.
What is the CVSS score of CVE-2026-78006?
CVE-2026-78006 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-78006?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78006, 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-2026-78006

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