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Vulnerability record · CVE-2021-36888 · published 15 December 2021

CVE-2021-36888: Blocksera image hover effects improper access control vulnerability

Blocksera · Image Hover Effects

Unauthenticated Arbitrary Options Update vulnerability leading to full website compromise discovered in Image Hover Effects Ultimate (versions <= 9.6.1) WordPress plugin.

9.8 CVSS 3.1 Critical EPSS 6.7% · top 6.3% CWE-284 · Improper access controlCWE-306 · Missing authentication for critical function
9.8CVSS 3.1 base score, v2 7.5
6.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

Unauthenticated Arbitrary Options Update vulnerability leading to full website compromise discovered in Image Hover Effects Ultimate (versions <= 9.6.1) WordPress plugin.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://patchstack.com/database/vulnerability/image-hover-effects-ultimate/wordpress-image-hover-effects-ultimate-plugin Third Party Advisory
https://wordpress.org/plugins/image-hover-effects-ultimate/#developers Release NotesVendor Advisory
https://patchstack.com/database/vulnerability/image-hover-effects-ultimate/wordpress-image-hover-effects-ultimate-plugin Third Party Advisory
https://wordpress.org/plugins/image-hover-effects-ultimate/#developers Release NotesVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-36888), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.