Medium severity6.1NVD Advisory· Published May 20, 2021· Updated Jun 17, 2026

CVE-2020-21054

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

FusionPBX/FusionPBX2 versions
cpe:2.3:a:fusionpbx:fusionpbx:4.5.7:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:fusionpbx:fusionpbx:4.5.7:*:*:*:*:*:*:*
- (no CPE)range: <4.5.7
FusionPBX/FusionPBXdescription

Patches

Vulnerability mechanics

References

github.com/fusionpbx/fusionpbx/commit/2489004c7b7e0b14e21cd86cedaab87fed209415nvdPatchThird Party Advisory
resp3ctblog.wordpress.com/2019/10/28/fusionpbx-xss-21/nvdThird Party Advisory

News mentions

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cvss	0.397
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000