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CVE-2026-31864

JumpServer has a Server-Side Template Injection Leading to RCE via YAML Rendering

MEDIUM
6.8
CVSS Score
Published: March 13, 2026 at 07:22 PM UTC
Updated: June 17, 2026 at 10:34 AM UTC
2 products affected across 2 vendorsJumpserverJumpserver

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Severity
MEDIUM6.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

JumpServer is an open source bastion host and an operation and maintenance security audit system. a Server-Side Template Injection (SSTI) vulnerability exists in JumpServer's Applet and VirtualApp upload functionality. This vulnerability can only be exploited by users with administrative privileges (Application Applet Management or Virtual Application Management permissions). Attackers can exploit this vulnerability to execute arbitrary code within the JumpServer Core container. The vulnerability arises from unsafe use of Jinja2 template rendering when processing user-uploaded YAML configuration files. When a user uploads an Applet or VirtualApp ZIP package, the manifest.yml file is rendered through Jinja2 without sandbox restrictions, allowing template injection attacks.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Jumpserver· FIT2CLOUD
95%
v < 3.10.224.0.0 ≤ v < 4.10.16
Jumpserver· Jumpserver
60%
v < 3.10.22v < 4.10.16
Affected range stops below 3.10.22, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.10.16, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_CONFIRMPatchVendor Advisory
Source: cverecord
https://github.com/jumpserver/jumpserver/security/advisories/GHSA-qx8h-rx2j-j5wc
x_refsource_MISCIssue Tracking
Source: cverecord
https://github.com/jumpserver/jumpserver/pull/16608

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.8MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-1336

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