CVE-2026-72794: siyuan before v3.7.4 Session Cookie Key Disclosure via getConf

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-12 · updated 2026-10-24
Weakness: CWE-522

Description

siyuan versions before v3.7.4 expose the session cookie signing key through the /api/system/getConf endpoint to unauthenticated users in publish mode. Attackers can retrieve the CookieKey value and forge valid session cookies to impersonate users or gain administrative access.

Affected products

siyuan-note siyuan: before 3.7.4 — fixed in 3.7.4

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.7.4. Check the vendor advisory for mitigations.

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-34fj-mwm6-fjfg
https://www.vulncheck.com/advisories/siyuan-before-session-cookie-key-disclosure-via-getconf
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-34fj-mwm6-fjfg

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