How severe is CVE-2026-31864?

CVE-2026-31864 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-31864 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-31864?

CVE-2026-31864 affects Fit2cloud Jumpserver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-31864?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-31864 have an EU (EUVD) identifier?

Yes. CVE-2026-31864 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12085.

When was CVE-2026-31864 published?

CVE-2026-31864 was published on 2026-03-13 and last updated on 2026-06-17.

CVE-2026-31864

CVE-2026-31864 is a medium-severity vulnerability in Fit2cloud Jumpserver with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1336.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12085
Weakness: CWE-1336
Affected product: Fit2cloud Jumpserver
Published: 2026-03-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-31864?: 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.
How severe is CVE-2026-31864?: CVE-2026-31864 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-31864 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-31864?: CVE-2026-31864 affects Fit2cloud Jumpserver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-31864?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-31864 have an EU (EUVD) identifier?: Yes. CVE-2026-31864 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12085.
When was CVE-2026-31864 published?: CVE-2026-31864 was published on 2026-03-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:*

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