VulnerabilityAnalyzed

CVE-2025-21609

SiYuan Note version 3.1.18 has an arbitrary file deletion vulnerability.

HIGH 8.7EPSS 0.60%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.60%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

SiYuan is self-hosted, open source personal knowledge management software. SiYuan Note version 3.1.18 has an arbitrary file deletion vulnerability. The vulnerability exists in the `POST /api/history/getDocHistoryContent` endpoint. An attacker can craft a payload to exploit this vulnerability, resulting in the deletion of arbitrary files on the server. Commit d9887aeec1b27073bec66299a9a4181dc42969f3 fixes this vulnerability and is expected to be available in version 3.1.19.

CVSS 4.0: 8.7 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.60% probability · 47th percentile
CISA KEV: Not listed
Weakness: CWE-459, CWE-552
Affected: b3log/siyuan
Source: security-advisories@github.com

References

https://github.com/siyuan-note/siyuan/commit/d9887aeec1b27073bec66299a9a4181dc42969f3Patch
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8fx8-pffw-w498Exploit, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.