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CVE-2021-34666

20
FAUCET Score

CVE-2021-34666 describes a Reflected Cross-Site Scripting (XSS) vulnerability in the Add Sidebar WordPress plugin, affecting versions up to and including 2.0.0. Attackers can exploit this by injecting arbitrary web scripts through the 'add' parameter in the wp_sidebarMenu.php file. This vulnerability carries a CVSS score of 6.1 (Medium), indicating a low attack complexity and requiring user interaction, with potential impacts including limited confidentiality and integrity compromise. The EPSS score is low, suggesting a minimal likelihood of exploitation. Currently, there is no evidence of active exploitation, nor are there publicly available exploit modules in Metasploit, Nuclei, or ExploitDB. Community discussion and media coverage for this CVE are also minimal, indicating a low level of public attention.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.0.0CPE matchmatch criteria
cpe:2.3:a:add_sidebar_project:add_sidebar:*:*:*:*:*:wordpress:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.84%
Probability of exploitation in next 30 days
EPSS Percentile
54.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0084 is in the 64th 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

plugins.trac.wordpress.org / browser/sidebar-adder/tags/2.0.1/wp_sidebarMenu.php
ExploitThird Party Advisory
wordfence.com / vulnerability-advisories
ExploitThird Party Advisory