CVE-2026-31798 JumpServer Improper Certificate Validation in Custom SMS API Client
Attackers can intercept MFA codes via improper certificate validation in the Custom SMS API, enabling account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-31798?
CVE-2026-31798 is a medium-severity vulnerability in jumpserver, published on 13 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-295
Which versions are affected by CVE-2026-31798?
It affects 1 product.
Products include Fit2cloud Jumpserver.
How do I fix CVE-2026-31798?
No fix has been published for CVE-2026-31798 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-31798 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-31798 exists.
Other vulnerabilities in jumpserver
- CVE-2024-40628 Arbitrary File Read in Ansible Playbooks in Jumpserver
- CVE-2024-40629 Arbitrary File Write in Ansible Playbooks leads to RCE in Jumpserver
- CVE-2024-29201 JumpServer's insecure Ansible playbook validation leads to RCE in Celery
- CVE-2024-29202 JumpServer vulnerable to Jinja2 template injection in Ansible leads to RCE in Celery
- CVE-2023-48193 Security feature bypass in n/a
Sources
Also known as GHSA-26pj-mmxw-w3w7.