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CVE-2021-36888

46
FAUCET Score

CVE-2021-36888 is a critical unauthenticated arbitrary options update vulnerability affecting the Image Hover Effects Ultimate WordPress plugin versions 9.6.1 and earlier. This flaw allows an attacker to fully compromise a website without authentication. With a CVSS score of 9.8 (Critical), the vulnerability is easily exploitable over the network with low attack complexity, leading to complete confidentiality, integrity, and availability compromise. While not listed in CISA's KEV catalog, public Nuclei templates exist for exploitation, and it has garnered significant community discussion with 10 mentions.

Impacted Technologies

VendorProductVersion(s)CPE
< 9.6.1CPE matchmatch criteria
cpe:2.3:a:blocksera:image_hover_effects:*:*:*:*:*:wordpress:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
6.74%
Probability of exploitation in next 30 days
EPSS Percentile
93.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Nuclei: CVE-2021-36888 · Nov 30, 2025
This CVE's current EPSS score of 0.0674 is in the 88th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

patchstack.com / database/vulnerability/image-hover-effects-ultimate/wordpress-image-hover-effects-ultimate-plugin-9-6-1-unauthenticated-arbitrary-options-update-leading-to-full-website-compromise
Third Party Advisory
wordpress.org / plugins/image-hover-effects-ultimate
Release NotesVendor Advisory