by Kastro
Paper/Archive/CVE-2026-23852

CVE-2026-23852

siyuan-note siyuan — SiYuan vulnerable to Stored XSS / RCE via `setBlockAttrs` icon attribute

EPSS 0.8%CVSS 9.6
critical.is priorityof 100
40
CVSS 9.6 (NVD)9.6 / 10 × 3028.8Not in CISA KEV+300.0EPSS percentile 56.9.569 × 2011.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

SiYuan is a personal knowledge management system. Versions prior to 3.5.4 have a stored Cross-Site Scripting (XSS) vulnerability that allows an attacker to inject arbitrary HTML attributes into the `icon` attribute of a block via the `/api/attr/setBlockAttrs` API. The payload is later rendered in the dynamic icon feature in an unsanitized context, leading to stored XSS and, in the desktop environment, potential remote code execution (RCE). This issue bypasses the previous fix for issue `#15970` (XSS → RCE via dynamic icons). Version 3.5.4 contains an updated fix.

Affected

ProductAffectedFixed inSource
siyuan< 3.5.4–CNA

Scores by source

NVD9.6CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
GitHub_M (CNA)5.8CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:P
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

refgithub.com/siyuan-note/siyuan/security/advisories/GHSA-7c6g-g2hx-23vvrefgithub.com/siyuan-note/siyuan/commit/0be7e1d4e0da9aac0da850b7aeb9b50ede7e5bdb