CVE-2026-66689: WordPress Anti Spam and list cleaner – AcyChecker plugin <= 2.0.0 - Broken Access Control vulnerability
Deferred
Published 13-08-2026Last modified 13-08-2026
Vulnerability summary
CVE-2026-66689 is a medium (CVSS 6.3) Missing Authorization vulnerability in acymailing newsletter team anti spam and list cleaner – acychecker. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.7% of scored vulnerabilities.
CVSS score
6.3/10
010
Medium · v3.1 (CVE.org)EPSS score
0.26%
0%100%
Low · +0.08 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Timeline
- 13-08-2026PublishedVulnerability first disclosed.
- 13-08-2026Last modifiedVulnerability information updated.
Description
Unauthenticated Broken Access Control in Anti Spam and list cleaner – AcyChecker <= 2.0.0 versions.
CVSS metrics
3 scores · 3 sources · 1 versionMedium 6.3Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:LSources3 sources · 5.3–6.3
- NVDNIST6.3MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- wordfenceSource5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NDiffers
EPSS trend
Probability
0.26%
Chance of exploitation in the next 30 days
Percentile
17%
Versus all other CVEs
30-day change
Increase +0.08 pp
From 0.18% on 22-09-2026
22-09-202622-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Acymailing newsletter team1 product
- anti spam and list cleaner – acychecker≥ n/a, ≤ 2.0.0
Wordpress1 product
- acychecker≤ 2.0.0 (fixed in 2.0.1)
2 vendors · 2 products
References
2 links- patchstack.com/database/…VDB Entry