What is CVE-2026-31864?

CVE-2026-31864 is a medium-severity vulnerability in Jumpserver, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 6.8/10. Published 2026-03-13.

How severe is CVE-2026-31864?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Jumpserver

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 c…

EPSS: 0.001 (18.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.

Affected products

Jumpserver — versions < 3.10.22, >= 4.0.0, < 4.10.16

Weakness classification (CWE)

CWE-1336 — Improper Neutralization of Special Elements Used in a Template Engine

References

https://github.com/jumpserver/jumpserver/security/advisories/GHSA-qx8h-rx2j-j5wc (x_refsource_CONFIRM)
https://github.com/jumpserver/jumpserver/pull/16608 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-31864?: CVE-2026-31864 is a medium-severity vulnerability in Jumpserver, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 6.8/10. Published 2026-03-13.
How severe is CVE-2026-31864?: Medium severity. CVSS v3 base score is 6.8 out of 10.