CVE-2026-31864Public exploitNetwork attack vector

Admin code execution via unsandboxed YAML rendering

Published Mar 13, 2026 · Updated Mar 13, 2026

Server-side template injection in JumpServer before 3.10.22 and 4.0.0 through 4.10.15 allows remote authenticated users to execute code. The yaml_load_with_i18n() function in apps/common/utils/yml.py passes an uploaded manifest.yml file to an unrestricted Jinja2 Environment and renders attacker-controlled expressions before parsing the YAML. Administrative Applet Management or Virtual Application Management permission and an uploaded Applet or VirtualApp ZIP are required; successful exploitation runs arbitrary code inside the Core container.

CVSS severity6.8
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side template injection in JumpServer before 3.10.22 and 4.0.0 through 4.10.15 allows remote authenticated users to execute code. The yaml_load_with_i18n() function in apps/common/utils/yml.py passes an uploaded manifest.yml file to an unrestricted Jinja2 Environment and renders attacker-controlled expressions before parsing the YAML. Administrative Applet Management or Virtual Application Management permission and an uploaded Applet or VirtualApp ZIP are required; successful exploitation runs arbitrary code inside the Core container.

The record

CVE
CVE-2026-31864
Published
Mar 13, 2026
Updated
Mar 13, 2026
Vendor
JumpServer
Product
JumpServer
Classifications
CWE-1336, T1059
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.10.22
  2. Affected versionversion=>= 4.0.0, < 4.10.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

JumpServer · JumpServerversion=< 3.10.22; version=>= 4.0.0, < 4.10.16

Published CVSS scores

6.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1336Improper Neutralization of Special Elements Used in a Template Engine
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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