CVE-2020-13758

modules/security/classes/general.post_filter.php/post_filter.php in the Web Application Firewall in Bitrix24 through 20.0.950 allows XSS by placing %00 before the payload.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
6.1 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
mitreCNA
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 35%
VendorProductVersion
bitrixbitrix24
𝑥
≤ 20.0.950
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://blog.deteact.com/bitrix-waf-bypass/
https://blog.deteact.com/bitrix-waf-bypass/