CVE-2026-18786

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-10. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

The CheckView WordPress plugin before 2.3.2 does not restrict its REST API authentication filter to its own routes and unconditionally discards the authentication error raised for any request whose URI merely contains a CheckView WordPress plugin before 2.3.2-specific string, making it possible for unauthenticated attackers to bypass the REST nonce check and perform any REST action available to a logged-in administrator, such as creating a new administrator account, via a crafted link an administrator is tricked into opening.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

August 10, 2026

Last Modified

August 11, 2026

Advisory Details (1)

Auto-updated Aug 11, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

CheckView < 2.3.2 – Administrator Account Creation via REST API Authentication Bypass | CVE 2026-18786 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/f53e1706-e926-4a2c-a2a7-465b4ca5d102/

Vendor Advisories for CVE-2026-18786(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 29× in last 7d / 45× 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 14:38 UTCGHSA enrichment
  2. 2026-08-20 03:29 UTCEG score recompute
  3. 2026-08-20 03:29 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-19 16:19 UTCGHSA enrichment
  6. 2026-08-19 05:08 UTCGHSA enrichment
  7. 2026-08-18 17:51 UTCEG score recompute
  8. 2026-08-18 17:51 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-18 06:33 UTCGHSA enrichment
  11. 2026-08-17 19:23 UTCEG score recompute
  12. 2026-08-17 19:23 UTCGHSA enrichment
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 06:35 UTCGHSA enrichment
  15. 2026-08-16 19:26 UTCEG score recompute
  16. 2026-08-16 19:26 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 08:12 UTCEG score recompute
  19. 2026-08-16 08:12 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 21:03 UTCGHSA enrichment
  22. 2026-08-15 09:53 UTCEG score recompute
  23. 2026-08-15 09:53 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 22:43 UTCGHSA enrichment
Show 20 more
  1. 2026-08-14 11:33 UTCGHSA enrichment
  2. 2026-08-14 00:24 UTCEG score recompute
  3. 2026-08-14 00:24 UTCGHSA enrichment
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-13 13:14 UTCGHSA enrichment
  6. 2026-08-13 02:04 UTCGHSA enrichment
  7. 2026-08-12 14:55 UTCEG score recompute
  8. 2026-08-12 14:55 UTCGHSA enrichment
  9. 2026-08-12 13:50 UTCEPSS rescore
  10. 2026-08-12 03:45 UTCEG score recompute
  11. 2026-08-12 03:45 UTCGHSA enrichment
  12. 2026-08-11 16:35 UTCGHSA enrichment
  13. 2026-08-11 15:21 UTCEG score recompute▲ 8.80
  14. 2026-08-11 15:21 UTCGHSA enrichment
  15. 2026-08-11 15:20 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  16. 2026-08-11 13:42 UTCEPSS rescore
  17. 2026-08-11 00:00 UTCEPSS rescore
  18. 2026-08-10 07:19 UTCNVD update
  19. 2026-08-10 06:41 UTCEG score recompute
  20. 2026-08-10 06:41 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18786?
CVE-2026-18786 is a high vulnerability published on August 10, 2026. The CheckView WordPress plugin before 2.3.2 does not restrict its REST API authentication filter to its own routes and unconditionally discards the authentication error raised for any request whose URI merely contains a CheckView WordPress plugin before 2.3.2-specific string, making it possible for…
When was CVE-2026-18786 disclosed?
CVE-2026-18786 was first published in the National Vulnerability Database on August 10, 2026, with the most recent update on August 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18786 actively exploited?
CVE-2026-18786 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 78.7% of all scored CVEs.
What is the CVSS score of CVE-2026-18786?
CVE-2026-18786 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-18786?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18786, 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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