CVE-2026-13390

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-07-27. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

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

The Events Calendar WordPress plugin before 6.16.5.1 does not perform an authorization check on one of its Event Aggregator import REST API routes and skips an integrity check for a particular status value, allowing unauthenticated attackers to mark existing import records as failed and to store arbitrary content in a hidden comment record.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

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
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

July 27, 2026

Last Modified

July 27, 2026

Advisory Details (1)

Auto-updated Jul 27, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

The Events Calendar < 6.16.5.1 – Unauthenticated Event Aggregator Import Status Manipulation | CVE 2026-13390 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/c7d3b1c5-3b3a-4359-aa41-0dfccb091fa4/

Vendor Advisories for CVE-2026-13390(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 17× in last 7d / 69× 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 134 total refreshes for this CVE.

  1. 2026-09-15 09:16 UTCEG score recompute
  2. 2026-09-15 09:16 UTCGHSA enrichment
  3. 2026-09-13 17:32 UTCEG score recompute
  4. 2026-09-13 17:32 UTCGHSA enrichment
  5. 2026-09-13 16:46 UTCEPSS rescore
  6. 2026-09-12 16:44 UTCEG score recompute
  7. 2026-09-12 16:44 UTCGHSA enrichment
  8. 2026-09-12 15:00 UTCEPSS rescore
  9. 2026-09-11 15:54 UTCEG score recompute
  10. 2026-09-11 15:54 UTCGHSA enrichment
  11. 2026-09-11 14:52 UTCEPSS rescore
  12. 2026-09-11 09:36 UTCEPSS rescore
  13. 2026-09-10 10:21 UTCEG score recompute
  14. 2026-09-10 10:21 UTCGHSA enrichment
  15. 2026-09-10 09:34 UTCEPSS rescore
  16. 2026-09-09 08:26 UTCEG score recompute
  17. 2026-09-09 08:26 UTCGHSA enrichment
  18. 2026-09-08 22:00 UTCEPSS rescore
  19. 2026-09-08 00:37 UTCEG score recompute
  20. 2026-09-08 00:37 UTCGHSA enrichment
  21. 2026-09-07 16:01 UTCEPSS rescore
  22. 2026-09-06 23:48 UTCEG score recompute
  23. 2026-09-06 23:48 UTCGHSA enrichment
  24. 2026-09-06 13:47 UTCEPSS rescore
  25. 2026-09-05 19:17 UTCEG score recompute
Show 75 more
  1. 2026-09-05 19:17 UTCGHSA enrichment
  2. 2026-09-04 12:36 UTCEG score recompute
  3. 2026-09-04 12:36 UTCGHSA enrichment
  4. 2026-09-04 05:06 UTCEPSS rescore
  5. 2026-09-02 14:11 UTCEPSS rescore
  6. 2026-09-01 23:04 UTCEG score recompute
  7. 2026-09-01 23:04 UTCGHSA enrichment
  8. 2026-09-01 13:53 UTCEPSS rescore
  9. 2026-09-01 04:39 UTCEPSS rescore
  10. 2026-08-31 00:46 UTCEG score recompute
  11. 2026-08-31 00:46 UTCGHSA enrichment
  12. 2026-08-30 19:17 UTCEPSS rescore
  13. 2026-08-30 01:21 UTCEPSS rescore
  14. 2026-08-29 23:58 UTCEG score recompute
  15. 2026-08-29 23:58 UTCGHSA enrichment
  16. 2026-08-28 21:40 UTCEPSS rescore
  17. 2026-08-28 02:26 UTCEG score recompute
  18. 2026-08-28 02:26 UTCGHSA enrichment
  19. 2026-08-27 14:24 UTCEPSS rescore
  20. 2026-08-27 01:36 UTCEG score recompute
  21. 2026-08-27 01:36 UTCGHSA enrichment
  22. 2026-08-26 00:48 UTCEG score recompute
  23. 2026-08-26 00:48 UTCGHSA enrichment
  24. 2026-08-25 13:48 UTCEPSS rescore
  25. 2026-08-25 00:00 UTCEG score recompute
  26. 2026-08-25 00:00 UTCGHSA enrichment
  27. 2026-08-23 23:12 UTCEG score recompute
  28. 2026-08-23 23:12 UTCGHSA enrichment
  29. 2026-08-23 00:19 UTCEPSS rescore
  30. 2026-08-22 22:24 UTCEG score recompute
  31. 2026-08-22 22:24 UTCGHSA enrichment
  32. 2026-08-21 23:48 UTCEPSS rescore
  33. 2026-08-21 21:36 UTCEG score recompute
  34. 2026-08-21 21:36 UTCGHSA enrichment
  35. 2026-08-20 22:55 UTCEPSS rescore
  36. 2026-08-20 20:48 UTCGHSA enrichment
  37. 2026-08-19 20:00 UTCEG score recompute
  38. 2026-08-19 20:00 UTCGHSA enrichment
  39. 2026-08-19 17:03 UTCEPSS rescore
  40. 2026-08-18 18:49 UTCEG score recompute
  41. 2026-08-18 18:49 UTCGHSA enrichment
  42. 2026-08-18 13:48 UTCEPSS rescore
  43. 2026-08-17 13:30 UTCEG score recompute
  44. 2026-08-17 13:30 UTCGHSA enrichment
  45. 2026-08-16 14:56 UTCEPSS rescore
  46. 2026-08-16 12:42 UTCEG score recompute
  47. 2026-08-16 12:42 UTCGHSA enrichment
  48. 2026-08-16 02:14 UTCEPSS rescore
  49. 2026-08-15 11:54 UTCEG score recompute
  50. 2026-08-15 11:54 UTCGHSA enrichment
  51. 2026-08-15 01:30 UTCEPSS rescore
  52. 2026-08-14 11:06 UTCEG score recompute
  53. 2026-08-14 11:06 UTCGHSA enrichment
  54. 2026-08-13 22:00 UTCEPSS rescore
  55. 2026-08-13 10:18 UTCEG score recompute
  56. 2026-08-13 10:18 UTCGHSA enrichment
  57. 2026-08-12 13:50 UTCEPSS rescore
  58. 2026-08-12 09:30 UTCEG score recompute
  59. 2026-08-12 09:30 UTCGHSA enrichment
  60. 2026-08-11 13:42 UTCEPSS rescore
  61. 2026-08-11 08:41 UTCEG score recompute
  62. 2026-08-11 08:41 UTCGHSA enrichment
  63. 2026-08-10 23:59 UTCEPSS rescore
  64. 2026-08-10 07:53 UTCEG score recompute
  65. 2026-08-10 07:53 UTCGHSA enrichment
  66. 2026-08-09 13:46 UTCEPSS rescore
  67. 2026-08-09 07:05 UTCEG score recompute
  68. 2026-08-09 07:05 UTCGHSA enrichment
  69. 2026-08-08 16:37 UTCEPSS rescore
  70. 2026-08-08 06:17 UTCEG score recompute
  71. 2026-08-08 06:17 UTCGHSA enrichment
  72. 2026-08-07 05:29 UTCEG score recompute
  73. 2026-08-07 05:29 UTCGHSA enrichment
  74. 2026-08-06 13:46 UTCEPSS rescore
  75. 2026-08-06 04:41 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-13390?
CVE-2026-13390 is a medium vulnerability published on July 27, 2026. The Events Calendar WordPress plugin before 6.16.5.1 does not perform an authorization check on one of its Event Aggregator import REST API routes and skips an integrity check for a particular status value, allowing unauthenticated attackers to mark existing import records as failed and to store…
When was CVE-2026-13390 disclosed?
CVE-2026-13390 was first published in the National Vulnerability Database on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13390 actively exploited?
CVE-2026-13390 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 92.1% of all scored CVEs.
What is the CVSS score of CVE-2026-13390?
CVE-2026-13390 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-13390?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13390, 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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