CVE-2020-13758

Name: CVE-2020-13758
Creator: NVD / NIST
Published: 2020-06-01T19:15:10.127+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.86%

Last modified Jun 17, 2026

CVE-2020-13758 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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.. EPSS estimates a 0.86% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.86%

53.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Bitrix	Bitrix24	<= 20.0.950

References

https://blog.deteact.com/bitrix-waf-bypass/Exploit, Third Party Advisory
https://blog.deteact.com/bitrix-waf-bypass/Exploit, Third Party Advisory

Timeline

Published: Jun 1, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is 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.

How severe is CVE-2020-13758?

CVE-2020-13758 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.86% probability of exploitation in the next 30 days.

How do I fix CVE-2020-13758?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-13758?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST