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CVE-2021-4424

15
FAUCET Score

CVE-2021-4424 describes a Cross-Site Request Forgery (CSRF) vulnerability in the Slider Hero WordPress plugin, affecting versions up to and including 8.2.0. This flaw stems from inadequate nonce validation in the qc_slider_hero_duplicate() function, allowing unauthenticated attackers to duplicate slides if they can trick an administrator into clicking a malicious link. The vulnerability has a CVSS score of 4.3 (Medium), indicating a network-based attack with low complexity but requiring user interaction, leading to a low impact on integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 8.2.0CPE matchmatch criteria
cpe:2.3:a:quantumcloud:slider_hero:*:*:*:*:*:wordpress:*:*

CVSS Data

CVSS version used by this source: 3.1

4.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.39%
Probability of exploitation in next 30 days
EPSS Percentile
32.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0039 is in the 33rd percentile among its peer group of 26,221 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

blog.nintechnet.com / 25-wordpress-plugins-vulnerable-to-csrf-attacks
Third Party Advisory
blog.nintechnet.com / more-wordpress-plugins-and-themes-vulnerable-to-csrf-attacks
Third Party Advisory
blog.nintechnet.com / multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-1
Third Party Advisory
blog.nintechnet.com / multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-2
Third Party Advisory
blog.nintechnet.com / multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-3
Third Party Advisory
blog.nintechnet.com / multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-4
Third Party Advisory
blog.nintechnet.com / multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5
Third Party Advisory
plugins.trac.wordpress.org / changeset/2548890/slider-hero/trunk/qcld-slider-main.php
Patch
wordfence.com / threat-intel/vulnerabilities/id/e6d195cd-4df8-4926-b834-d695fc05f81d
Third Party Advisory