What’s Vulnerable › Vulnerabilities

CVE-2021-34815

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-18 · updated 2026-06-17
• Weakness: CWE-79

Description

CheckSec Canopy before 3.5.2 allows XSS attacks against the login page via the LOGIN_PAGE_DISCLAIMER parameter.

Affected products

• Checksec Canopy: before 3.5.2 — fixed in 3.5.2

How to fix

Upgrade to a fixed version: Checksec Canopy 3.5.2. Check the vendor advisory for mitigations.

References

• https://www.checksec.com/canopy.html
• https://www.compass-security.com/en/research/advisories
• https://www.compass-security.com/fileadmin/Research/Advisories/2021-10_CSNC-2021-015-Checksec_Canopy_HTLM_Injection.txt
• https://www.checksec.com/canopy.html
• https://www.compass-security.com/en/research/advisories
• https://www.compass-security.com/fileadmin/Research/Advisories/2021-10_CSNC-2021-015-Checksec_Canopy_HTLM_Injection.txt

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