CVE-2026-16623

HIGHPre-NVD 8.08.0—
EchelonGraph scoreHIGH 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 a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.0Exploit: None knownExposed: 0

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

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
8.0(high)
EG Risk
36(Track)
EG Risk 36/100SSVC: 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
Severity80% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

August 4, 2026

Last Modified

August 4, 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 26× in last 7d / 67× 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. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 22:20 UTCGHSA enrichment
  3. 2026-08-20 09:25 UTCGHSA enrichment
  4. 2026-08-19 20:29 UTCEG score recompute
  5. 2026-08-19 20:29 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-19 07:33 UTCGHSA enrichment
  8. 2026-08-18 18:38 UTCEG score recompute
  9. 2026-08-18 18:38 UTCGHSA enrichment
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-18 05:42 UTCGHSA enrichment
  12. 2026-08-17 16:46 UTCEG score recompute
  13. 2026-08-17 16:46 UTCGHSA enrichment
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 03:50 UTCEG score recompute
  16. 2026-08-17 03:50 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 14:54 UTCEG score recompute
  19. 2026-08-16 14:54 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-16 01:59 UTCGHSA enrichment
  22. 2026-08-15 13:03 UTCEG score recompute
  23. 2026-08-15 13:03 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-15 00:07 UTCGHSA enrichment
Show 42 more
  1. 2026-08-14 11:12 UTCGHSA enrichment
  2. 2026-08-13 22:16 UTCGHSA enrichment
  3. 2026-08-13 09:20 UTCGHSA enrichment
  4. 2026-08-12 20:25 UTCEG score recompute
  5. 2026-08-12 20:25 UTCGHSA enrichment
  6. 2026-08-12 13:50 UTCEPSS rescore
  7. 2026-08-12 07:29 UTCGHSA enrichment
  8. 2026-08-11 18:33 UTCEG score recompute
  9. 2026-08-11 18:33 UTCGHSA enrichment
  10. 2026-08-11 13:42 UTCEPSS rescore
  11. 2026-08-11 05:38 UTCEG score recompute
  12. 2026-08-11 05:38 UTCGHSA enrichment
  13. 2026-08-11 00:00 UTCEPSS rescore
  14. 2026-08-10 16:42 UTCGHSA enrichment
  15. 2026-08-10 03:46 UTCGHSA enrichment
  16. 2026-08-09 14:50 UTCEG score recompute
  17. 2026-08-09 14:50 UTCGHSA enrichment
  18. 2026-08-09 13:46 UTCEPSS rescore
  19. 2026-08-09 01:55 UTCEG score recompute
  20. 2026-08-09 01:55 UTCGHSA enrichment
  21. 2026-08-08 16:37 UTCEPSS rescore
  22. 2026-08-08 12:59 UTCGHSA enrichment
  23. 2026-08-08 00:03 UTCEG score recompute
  24. 2026-08-08 00:03 UTCGHSA enrichment
  25. 2026-08-07 11:07 UTCGHSA enrichment
  26. 2026-08-06 22:11 UTCEG score recompute
  27. 2026-08-06 22:11 UTCGHSA enrichment
  28. 2026-08-06 13:46 UTCEPSS rescore
  29. 2026-08-06 09:15 UTCGHSA enrichment
  30. 2026-08-05 20:20 UTCEG score recompute
  31. 2026-08-05 20:20 UTCGHSA enrichment
  32. 2026-08-05 19:17 UTCEPSS rescore
  33. 2026-08-05 07:24 UTCEG score recompute
  34. 2026-08-05 07:24 UTCGHSA enrichment
  35. 2026-08-04 18:25 UTCGHSA enrichment
  36. 2026-08-04 17:50 UTCEG score recompute▲ 8.00
  37. 2026-08-04 17:49 UTCGHSA enrichment
  38. 2026-08-04 17:46 UTCMITRE cvelistV5CVSS v3 → 8 · severity → HIGH
  39. 2026-08-04 15:10 UTCEPSS rescore
  40. 2026-08-04 07:17 UTCNVD update
  41. 2026-08-04 06:35 UTCEG score recompute
  42. 2026-08-04 06:33 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 in the National Vulnerability Database on August 4, 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% probability of exploitation in the next 30 days, which ranks it in the top 84.9% of all 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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16623, 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

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