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TI-2025-15569 Aliases CVE-2025-21609GHSA-8fx8-pffw-w498

SiYuan has an arbitrary file deletion vulnerability

Priority MEDIUM 45CWE-459Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-552.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00626 50th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
siyuan-notesiyuan= 3.1.18—No fix listedCNA
—github.com/siyuan-note/siyuan/kernel (Go)all versions—No fix listedGHSA-8fx8-pffw-w498
  • siyuan Vendorsiyuan-note Affected = 3.1.18 Fixed in — No fix listed CNA
  • github.com/siyuan-note/siyuan/kernel (Go) Vendor— Affected all versions Fixed in — No fix listed GHSA-8fx8-pffw-w498

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:b3log:siyuan:3.1.18:-:*:*:*:*:*:*3.1.18Vulnerablesiyuan-note
  • cpe:2.3:a:b3log:siyuan:3.1.18:-:*:*:*:*:*:* Versions 3.1.18 Vulnerable ·siyuan-note

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-21609
  2. 2026-10-03 Alias added: GHSA-8fx8-pffw-w498
  3. 2026-10-31 EPSS moved to the 50th–90th percentile

References

Exploit 1

Patch 1

Advisory 1

Other 1

  • TI-2026-26050 SiYuan has directory traversal within its publishing service CVSS 3.1CRITICAL 9.8
  • TI-2026-25256 SiYuan: Authorization Bypass Allows Arbitrary SQL Execution via Search API CVSS 3.1CRITICAL 9.8
  • TI-2024-35827 A SQL injection vulnerability was discovered in Siyuan 3.1.11 in /getHistoryItems. CVSS 3.1CRITICAL 9.8
  • TI-2024-35826 A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the ids array parameter in /batchGetBlockAttrs. CVSS 3.1CRITICAL 9.8
  • TI-2024-35825 A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the id parameter at /getAssetContent. CVSS 3.1CRITICAL 9.8
  • TI-2024-35824 A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the notebook parameter in /searchHistory. CVSS 3.1CRITICAL 9.8
See all 54 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences