Medium severity · published Mar 13, 2026
CVE-2026-31798
JumpServer Improper Certificate Validation in Custom SMS API Client
5.0
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 1% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JU
jumpserver · jumpserver
< 4.10.16-lts · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-31798
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-31798
Vendor Advisory
https://github.com/jumpserver/jumpserver/security/advisories/GHSA-26pj-mmxw-w3w7
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