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Vulnerability record · CVE-2026-87812 · published 9 September 2026

CVE-2026-87812: Cross-site scripting vulnerability

SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in Bazaar package cards where the iconURL metadata is inserted directly into HTML img src attributes without escaping. Attackers can inject malicious URLs with event handlers that execute JavaScript in the authenticated SiYuan origin when users view Bazaar listings, enabling API requests and application state manipulation.

7.4 CVSS 4.0 High EPSS 0.36% · top 72.6% CWE-79 · Cross-site scripting Deferred
7.4CVSS 4.0 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
10 Sep 2026Last modified by NVD

Description

SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in Bazaar package cards where the iconURL metadata is inserted directly into HTML img src attributes without escaping. Attackers can inject malicious URLs with event handlers that execute JavaScript in the authenticated SiYuan origin when users view Bazaar listings, enabling API requests and application state manipulation.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-rvcf-q4h8-w6c9
https://www.vulncheck.com/advisories/siyuan-before-3.8.2-stored-xss-via-bazaar-iconurl

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Source: NIST National Vulnerability Database (record CVE-2026-87812), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.