SB2026042798 - Multiple vulnerabilities in JumpServer
Published: April 27, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Improper Certificate Validation (CVE-ID: CVE-2026-31798)
CWE-ID: CWE-295 - Improper Certificate Validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to bypass multi-factor authentication and gain unauthorized access to accounts.
The vulnerability exists due to improper certificate validation in the custom SMS API client when sending OTP codes to a custom SMS API over HTTPS. A remote attacker can perform a man-in-the-middle interception with a bogus certificate to capture the verification code and bypass multi-factor authentication and gain unauthorized access to accounts.
User interaction is required because a victim must initiate a login flow that triggers delivery of an OTP code.
2) Improper Neutralization of Special Elements Used in a Template Engine (CVE-ID: CVE-2026-31864)
CWE-ID: CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to server-side template injection in yaml_load_with_i18n() in apps/common/utils/yml.py when processing user-uploaded YAML configuration files from Applet or VirtualApp ZIP packages. A remote privileged user can upload a specially crafted ZIP package containing a malicious manifest.yml file to execute arbitrary code.
User interaction is required for the upload and processing of an Applet or VirtualApp package.
Remediation
Install update from vendor's website.