LedgerSMB does not sufficiently guard against being wrapped by other sites, making it vulnerable to 'clickjacking'. This allows an attacker to trick a targetted user to execute unintended actions.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-3731
• https://huntr.dev/bounties/5664331d-f5f8-4412-8566-408f8655888a
• https://ledgersmb.org/cve-2021-3731-clickjacking
• https://www.debian.org/security/2021/dsa-4962