CVE-2026-16623

HIGHPre-NVD 8.08.0—
EchelonGraph scoreMEDIUM confidence

Score 8.0 from GitHub Security Advisory (severity: HIGH) published 2026-08-04. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.0EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.0Exploit: None knownExposed services: Not assessed

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

The Create Block WordPress plugin before 2.10.0 does not correctly escape user-supplied text before writing it into a generated PHP pattern file, allowing a multisite subsite administrator (who holds the capability gating this action but is denied the capability that normally gates PHP file editing) to inject and execute arbitrary PHP code on the server.

CVSS v3
8.0
EG Score
8.0HIGHmedium confidence
EG Risk
36
EG Risk 36/100CISA SSVC

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
Severity80% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
37th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 4, 2026

Last Modified

August 26, 2026

Advisory Details (1)

Auto-updated Aug 4, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Create Block Theme < 2.10.0 – Admin+ PHP Code Injection via Pattern Save (Multisite) | CVE 2026-16623 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/19c7fdaa-5e75-481d-884c-68fdb2fb8f8d/

Vendor Advisories for CVE-2026-16623(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 18× in last 7d / 84× 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 198 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-16623?
CVE-2026-16623 is a high vulnerability published on August 4, 2026. The Create Block WordPress plugin before 2.10.0 does not correctly escape user-supplied text before writing it into a generated PHP pattern file, allowing a multisite subsite administrator (who holds the capability gating this action but is denied the capability that normally gates PHP file…
When was CVE-2026-16623 disclosed?
CVE-2026-16623 was first published on August 4, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16623 actively exploited?
CVE-2026-16623 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16623?
CVE-2026-16623 has a CVSS v3.1 base score of 8.0 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-16623?
No fix for CVE-2026-16623 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-16623 are linked in the Vendor Advisories panel on this page.

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