CVE-2026-66689

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreHIGH confidence

Score 6.3 from GitHub Security Advisory published 2026-08-13. a secondary CVSS source baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: None knownExposed: 0

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

Unauthenticated Broken Access Control in Anti Spam and list cleaner – AcyChecker <= 2.0.0 versions.

CVSS v3
6.3
EG Score
6.3(high)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity63% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 14, 2026

Advisory Details (1)

Auto-updated Aug 13, 2026
No patch confirmed yet.
generic

Broken Access Control in WordPress Anti Spam and list cleaner &#8211; AcyChecker Plugin - Patchstack

https://patchstack.com/database/wordpress/plugin/acychecker/vulnerability/wordpress-anti-spam-and-list-cleaner-acychecker-plugin-2-0-0-broken-access-control-vulnerability?_s_id=cve

Vendor Advisories for CVE-2026-66689(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 20× in last 7d / 26× 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. 2026-08-21 01:07 UTCEG score recompute
  2. 2026-08-21 01:07 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 00:08 UTCEG score recompute
  5. 2026-08-20 00:08 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-18 23:08 UTCEG score recompute
  8. 2026-08-18 23:08 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-17 22:10 UTCEG score recompute
  11. 2026-08-17 22:10 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-16 21:12 UTCEG score recompute
  14. 2026-08-16 21:12 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-15 20:14 UTCEG score recompute
  17. 2026-08-15 20:14 UTCGHSA enrichment
  18. 2026-08-15 01:30 UTCEPSS rescore
  19. 2026-08-14 19:15 UTCGHSA enrichment
  20. 2026-08-14 17:24 UTCGHSA enrichment
  21. 2026-08-13 16:26 UTCEG score recompute
  22. 2026-08-13 16:26 UTCGHSA enrichment
  23. 2026-08-13 15:32 UTCEG score recompute
  24. 2026-08-13 14:20 UTCEG score recompute
  25. 2026-08-13 13:52 UTCEG score recompute
Show 1 more
  1. 2026-08-13 13:51 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66689?
CVE-2026-66689 is a medium vulnerability published on August 13, 2026. Unauthenticated Broken Access Control in Anti Spam and list cleaner &#8211; AcyChecker <= 2.0.0 versions.
When was CVE-2026-66689 disclosed?
CVE-2026-66689 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66689 actively exploited?
CVE-2026-66689 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 91.1% of all scored CVEs.
What is the CVSS score of CVE-2026-66689?
CVE-2026-66689 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-66689?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66689, 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

Explore the affected products and dependency analysis for CVE-2026-66689

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