What’s Vulnerable › Vulnerabilities

CVE-2020-21054

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-20 · updated 2026-06-17
• Weakness: CWE-79

Description

Cross Site Scripting (XSS) vulnerability in FusionPBX 4.5.7 allows remote malicious users to inject arbitrary web script or HTML via an unsanitized "f" variable in app\vars\vars_textarea.php.

Affected products

• fusionpbx: 4.5.7

References

• https://github.com/fusionpbx/fusionpbx/commit/2489004c7b7e0b14e21cd86cedaab87fed209415
• https://resp3ctblog.wordpress.com/2019/10/28/fusionpbx-xss-21/
• https://github.com/fusionpbx/fusionpbx/commit/2489004c7b7e0b14e21cd86cedaab87fed209415
• https://resp3ctblog.wordpress.com/2019/10/28/fusionpbx-xss-21/

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