CVE-2026-78159

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 week
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: None knownExposed: 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, 6.17.3 via the parse_array function. This is due to insufficient validation of the widget 'classes' map, allowing a plain-array payload to bypass the is_safe_widget_instance() object check and reach the callable-invocation sink in Element_Classes::parse_array(). This makes it possible for unauthenticated attackers to execute code on the server. Exploitation requires that the targeted site has comments enabled on tribe_events posts and that at least one comment containing a crafted wp:legacy-widget block has been submitted, as the attack chain is triggered when do_blocks() processes the single-event HTML including the comment area.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
71%
KEV
Not listed

Published

September 12, 2026

Last Modified

September 14, 2026

References (7)

Vendor Advisories for CVE-2026-78159(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 55× in last 7d / 109× 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.

Showing the most recent 100 of 109 total refreshes for this CVE.

  1. 2026-09-25 11:04 UTCGHSA enrichment
  2. 2026-09-25 07:07 UTCGHSA enrichment
  3. 2026-09-25 03:10 UTCGHSA enrichment
  4. 2026-09-24 23:07 UTCGHSA enrichment
  5. 2026-09-24 19:09 UTCGHSA enrichment
  6. 2026-09-24 15:12 UTCEG score recompute
  7. 2026-09-24 15:12 UTCGHSA enrichment
  8. 2026-09-24 14:04 UTCEPSS rescore
  9. 2026-09-24 11:13 UTCGHSA enrichment
  10. 2026-09-24 07:16 UTCGHSA enrichment
  11. 2026-09-24 03:20 UTCGHSA enrichment
  12. 2026-09-23 23:23 UTCGHSA enrichment
  13. 2026-09-23 19:25 UTCEG score recompute
  14. 2026-09-23 19:25 UTCGHSA enrichment
  15. 2026-09-23 17:54 UTCEPSS rescore
  16. 2026-09-23 15:23 UTCGHSA enrichment
  17. 2026-09-23 11:24 UTCGHSA enrichment
  18. 2026-09-23 07:28 UTCGHSA enrichment
  19. 2026-09-23 03:31 UTCGHSA enrichment
  20. 2026-09-22 23:34 UTCGHSA enrichment
  21. 2026-09-22 19:18 UTCEG score recompute
  22. 2026-09-22 19:18 UTCGHSA enrichment
  23. 2026-09-22 16:01 UTCEPSS rescore
  24. 2026-09-22 15:18 UTCGHSA enrichment
  25. 2026-09-22 11:21 UTCGHSA enrichment
Show 75 more
  1. 2026-09-22 07:24 UTCGHSA enrichment
  2. 2026-09-22 03:27 UTCGHSA enrichment
  3. 2026-09-21 23:31 UTCEG score recompute
  4. 2026-09-21 23:30 UTCGHSA enrichment
  5. 2026-09-21 21:09 UTCEPSS rescore
  6. 2026-09-21 19:33 UTCGHSA enrichment
  7. 2026-09-21 15:36 UTCGHSA enrichment
  8. 2026-09-21 11:39 UTCGHSA enrichment
  9. 2026-09-21 07:42 UTCGHSA enrichment
  10. 2026-09-21 03:45 UTCGHSA enrichment
  11. 2026-09-20 23:48 UTCEG score recompute
  12. 2026-09-20 23:48 UTCGHSA enrichment
  13. 2026-09-20 20:16 UTCEPSS rescore
  14. 2026-09-20 19:51 UTCGHSA enrichment
  15. 2026-09-20 15:54 UTCGHSA enrichment
  16. 2026-09-20 11:57 UTCGHSA enrichment
  17. 2026-09-20 08:00 UTCGHSA enrichment
  18. 2026-09-20 03:51 UTCGHSA enrichment
  19. 2026-09-19 23:52 UTCGHSA enrichment
  20. 2026-09-19 19:55 UTCGHSA enrichment
  21. 2026-09-19 15:58 UTCEG score recompute
  22. 2026-09-19 15:58 UTCGHSA enrichment
  23. 2026-09-19 11:55 UTCGHSA enrichment
  24. 2026-09-19 07:58 UTCGHSA enrichment
  25. 2026-09-19 04:02 UTCGHSA enrichment
  26. 2026-09-19 00:04 UTCGHSA enrichment
  27. 2026-09-18 20:08 UTCEG score recompute
  28. 2026-09-18 20:08 UTCGHSA enrichment
  29. 2026-09-18 19:28 UTCEPSS rescore
  30. 2026-09-18 16:10 UTCGHSA enrichment
  31. 2026-09-18 11:43 UTCGHSA enrichment
  32. 2026-09-18 07:46 UTCGHSA enrichment
  33. 2026-09-18 03:49 UTCGHSA enrichment
  34. 2026-09-17 23:52 UTCGHSA enrichment
  35. 2026-09-17 19:36 UTCEG score recompute
  36. 2026-09-17 19:36 UTCGHSA enrichment
  37. 2026-09-17 13:44 UTCGHSA enrichment
  38. 2026-09-17 09:47 UTCGHSA enrichment
  39. 2026-09-17 05:50 UTCGHSA enrichment
  40. 2026-09-17 01:52 UTCGHSA enrichment
  41. 2026-09-16 21:55 UTCGHSA enrichment
  42. 2026-09-16 17:58 UTCEG score recompute
  43. 2026-09-16 17:58 UTCGHSA enrichment
  44. 2026-09-16 14:08 UTCEPSS rescore
  45. 2026-09-16 13:14 UTCGHSA enrichment
  46. 2026-09-16 09:14 UTCGHSA enrichment
  47. 2026-09-16 05:17 UTCEG score recompute
  48. 2026-09-16 05:17 UTCGHSA enrichment
  49. 2026-09-16 05:15 UTCEPSS rescore
  50. 2026-09-16 01:20 UTCGHSA enrichment
  51. 2026-09-15 21:21 UTCGHSA enrichment
  52. 2026-09-15 17:24 UTCGHSA enrichment
  53. 2026-09-15 13:26 UTCGHSA enrichment
  54. 2026-09-15 09:29 UTCGHSA enrichment
  55. 2026-09-15 05:32 UTCEG score recompute
  56. 2026-09-15 05:32 UTCGHSA enrichment
  57. 2026-09-15 03:12 UTCEPSS rescore
  58. 2026-09-15 03:12 UTCEPSS rescore
  59. 2026-09-15 01:31 UTCGHSA enrichment
  60. 2026-09-14 21:34 UTCGHSA enrichment
  61. 2026-09-14 17:28 UTCEG score recompute
  62. 2026-09-14 17:28 UTCGHSA enrichment
  63. 2026-09-14 16:20 UTCEG score recompute
  64. 2026-09-14 16:20 UTCGHSA enrichment
  65. 2026-09-14 13:58 UTCGHSA enrichment
  66. 2026-09-14 11:42 UTCGHSA enrichment
  67. 2026-09-14 07:46 UTCGHSA enrichment
  68. 2026-09-14 03:49 UTCGHSA enrichment
  69. 2026-09-13 23:52 UTCGHSA enrichment
  70. 2026-09-13 19:56 UTCEG score recompute
  71. 2026-09-13 19:56 UTCGHSA enrichment
  72. 2026-09-13 15:59 UTCGHSA enrichment
  73. 2026-09-13 12:02 UTCGHSA enrichment
  74. 2026-09-13 08:04 UTCGHSA enrichment
  75. 2026-09-13 04:08 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78159?
CVE-2026-78159 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, 6.17.3 via the parsearray function. This is due to insufficient validation of the widget 'classes' map, allowing a plain-array payload to bypass the issafewidgetinstance()…
When was CVE-2026-78159 disclosed?
CVE-2026-78159 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-2026-78159 actively exploited?
CVE-2026-78159 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 28.8% of all scored CVEs.
What is the CVSS score of CVE-2026-78159?
CVE-2026-78159 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-78159?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78159, 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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