CVE-2021-27963

HIGH

SonLogger < 6.4.1 - Unauthenticated User Creation with Arbitrary Permissions via /User/saveUser

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-27963. PoCs published by erberkan.

AI-analyzed exploit summary The repository contains functional exploit code for CVE-2021-27963, which allows unauthenticated creation of a SuperAdmin account in SonLogger via insecure POST requests. It includes a Python script demonstrating the vulnerability and a Metasploit module for arbitrary file upload (CVE-2021-27964).

Description

SonLogger before 6.4.1 is affected by user creation with any user permissions profile (e.g., SuperAdmin). An anonymous user can send a POST request to /User/saveUser without any authentication or session header.

Exploits (1)

nomisec WORKING POC 1 stars
by erberkan · poc
https://github.com/erberkan/SonLogger-vulns

The repository contains functional exploit code for CVE-2021-27963, which allows unauthenticated creation of a SuperAdmin account in SonLogger via insecure POST requests. It includes a Python script demonstrating the vulnerability and a Metasploit module for arbitrary file upload (CVE-2021-27964).

Classification
Working Poc 95%
Attack Type
Auth Bypass
Complexity
Trivial
Reliability
Reliable
Target: SonLogger 4.2.3.3
No auth needed
Prerequisites: Network access to the target SonLogger instance
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (2)

Core 2
Core References
Exploit, Third Party Advisory x_refsource_misc
https://github.com/erberkan/SonLogger-vulns
Release Notes, Vendor Advisory x_refsource_misc
https://www.sonlogger.com/releasenotes

Scores

CVSS v3 8.2
EPSS 0.0245
EPSS Percentile 82.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Details

CWE
CWE-306
Status published
Products (1)
sfcyazilim/sonlogger < 6.4.1
Published Mar 05, 2021
Tracked Since Feb 18, 2026