TI-2020-17137 Aliases CVE-2020-28206 GHSA-hfhh-3vvv-4gqf

An issue was discovered in Bitrix24 Bitrix Framework (1c site management) 20.0.

LOW 31CWE-307Published 2020-12-02 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-307.

Summary

An issue was discovered in Bitrix24 Bitrix Framework (1c site management) 20.0. An "User enumeration and Improper Restriction of Excessive Authentication Attempts" vulnerability exists in the admin login form, allowing a remote user to enumerate users in the administrator group. This also allows brute-force attacks on the passwords of users not in the administrator group.

Why it matters now

EPSS 0.0114 66th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:bitrix24:bitrix_framework:20.0:::::::*	20.0	Vulnerable	Bitrix24

cpe:2.3:a:bitrix24:bitrix_framework:20.0:*:*:*:*:*:*:* Versions 20.0 Vulnerable ·Bitrix24

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2020-28206
2026-10-03 Alias added: GHSA-hfhh-3vvv-4gqf

References

Exploit 1

https://justrealstag.medium.com/user-enumeration-improper-restriction-of-excessive-authentication-attempts-in-bitrix-98933a97e0e6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences