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CVE-2021-27309

28
FAUCET Score

CVE-2021-27309 describes an unauthenticated reflected Cross-Site Scripting (XSS) vulnerability in Clansphere CMS version 2011.4, specifically through the "module" parameter. This medium-severity flaw (CVSS 6.1) requires user interaction and could lead to limited impact on confidentiality and integrity. While no active exploitation or public exploit code (Metasploit, ExploitDB) has been identified, a Nuclei template exists for detection. Community discussion and media coverage for this CVE are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
2011.4CPE matchmatch criteria
cpe:2.3:a:csphere:clansphere:2011.4:*:*:*:*:*:*:*

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
1.98%
Probability of exploitation in next 30 days
EPSS Percentile
78.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Nuclei: CVE-2021-27309 · Nov 24, 2021
This CVE's current EPSS score of 0.0198 is in the 89th percentile among its peer group of 26,234 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

github.com / xoffense/POC/blob/main/Clansphere%202011.4%20%22module%22%20xss.md
ExploitThird Party Advisory