Server-Side Request Forgery in SiYuan by SiYuan Team
CVE-2026-82234

8.4HIGH

Key Information:

Vendor

Siyuan-note

Status
Siyuan
Vendor
CVE Published:
28 August 2026

What is CVE-2026-82234?

SiYuan versions prior to v3.8.1 are susceptible to a server-side request forgery (SSRF) vulnerability stemming from improper validation in the http_request and web_fetch agent tools. This flaw permits attackers to exploit DNS rebinding, which can allow them to manipulate DNS responses at guard time without verification at connect time. Consequently, they can bypass SSRF defenses to gain unauthorized access to sensitive cloud instance metadata and other internal services.

Affected Version(s)

siyuan 0 < 3.8.1

siyuan 3.8.1

References

https://github.com/siyuan-note/siyuan/security/advisories...
vendor-advisory
https://www.vulncheck.com/advisories/siyuan-before-3.8.1-...
third-party-advisory

CVSS V4

Score:
8.4
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

joysinleung
.