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CVE-2021-4403

16
FAUCET Score

CVE-2021-4403 describes a Cross-Site Request Forgery (CSRF) vulnerability in the Remove Schema plugin for WordPress, affecting versions up to and including 1.5. This flaw stems from inadequate nonce validation within the validate() function, allowing unauthenticated attackers to modify plugin settings. The vulnerability has a CVSS score of 4.3 (MEDIUM), indicating a network-based attack with low complexity, requiring user interaction, and resulting in low integrity impact. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.5CPE matchmatch criteria
cpe:2.3:a:websitescanner:remove_schema:*:*:*:*:*: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 26,219 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
Not Applicable
blog.nintechnet.com / more-wordpress-plugins-and-themes-vulnerable-to-csrf-attacks
Not Applicable
blog.nintechnet.com / multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-1
Not Applicable
blog.nintechnet.com / multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-2
Not Applicable
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
Not Applicable
blog.nintechnet.com / multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5
Not Applicable
plugins.trac.wordpress.org / changeset
Patch
wordfence.com / threat-intel/vulnerabilities/id/89635463-966d-4f7d-995d-ad83a502d95b
Third Party Advisory