CVE-2024-55660: SiYuan has an SSTI via /api/template/renderSprig

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-12-12 · updated 2026-06-17
Weakness: CWE-1336

Description

SiYuan is a personal knowledge management system. Prior to version 3.1.16, SiYuan's `/api/template/renderSprig` endpoint is vulnerable to Server-Side Template Injection (SSTI) through the Sprig template engine. Although the engine has limitations, it allows attackers to access environment variables. Version 3.1.16 contains a patch for the issue.

Affected products

siyuan-note siyuan: 3.1.15

References

https://github.com/siyuan-note/siyuan/commit/e70ed57f6e4852e2bd702671aeb8eb3a47a36d71
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4pjc-pwgq-q9jp

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