CVE-2026-31798— JumpServer Improper Certificate Validation in Custom SMS API Client
Quick assessment
Affected
jumpserver jumpserver
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
JumpServer是中国杭州飞致云信息科技（JumpServer）公司的一款开源堡垒机。 JumpServer v4.10.16-lts之前版本存在信任管理问题漏洞，该漏洞源于自定义短信API客户端证书验证不当，可能导致攻击者拦截请求并获取验证码。
Possible ATT&CK Techniques 3 AI
T1040 · Network Sniffing T1041 · Exfiltration Over C2 Channel T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-31798
Vulnerability Information
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Vulnerability Title
JumpServer Improper Certificate Validation in Custom SMS API Client
Source: CVE Program / CVE List V5
Vulnerability Description
JumpServer is an open source bastion host and an operation and maintenance security audit system. Prior to v4.10.16-lts, JumpServer improperly validates certificates in the Custom SMS API Client. When JumpServer sends MFA/OTP codes via Custom SMS API, an attacker can intercept the request and capture the verification code BEFORE it reaches the user's phone. This vulnerability is fixed in v4.10.16-lts.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
JumpServer 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JumpServer是中国杭州飞致云信息科技（JumpServer）公司的一款开源堡垒机。 JumpServer v4.10.16-lts之前版本存在信任管理问题漏洞，该漏洞源于自定义短信API客户端证书验证不当，可能导致攻击者拦截请求并获取验证码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| jumpserver | jumpserver | < 4.10.16-lts | - |
|
II. Public POCs for CVE-2026-31798
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-31798 (1)
IV. Related Vulnerabilities
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CVE-2026-44846
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CVE-2026-54336
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CVE-2026-31864
JumpServer has a Server-Side Template Injection Leading to R -
CVE-2025-58044
JumpServer has an Open Redirect Vulnerability
Same vendor: jumpserver
-
CVE-2026-44846
JumpServer: Privilege Overwrite via Organization Invite Logi -
CVE-2026-44845
JumpServer: Remote Command Execution (RCE) via Jinja Templat -
CVE-2026-54336
JumpServer: KoKo Web Terminal SFTP Path Traversal on Authori -
CVE-2026-31864
JumpServer has a Server-Side Template Injection Leading to R -
CVE-2025-58044
JumpServer has an Open Redirect Vulnerability
Same weakness: CWE-295
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V. Comments for CVE-2026-31798
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