CVE-2026-23850
B3log Siyuan path traversal
- Published19 Jan 2026
Description
SiYuan is a personal knowledge management system. In versions prior to 3.5.4, the markdown feature allows unrestricted server side html-rendering which allows arbitrary file read (LFD). Version 3.5.4 fixes the issue.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NAffected products
Remediation
References
- https://github.com/siyuan-note/siyuan/blob/master/kernel/model/file.go#L1035
- https://github.com/siyuan-note/siyuan/blob/v3.4.2/kernel/api/filetree.go#L799-L886
- https://github.com/siyuan-note/siyuan/commit/b2274baba2e11c8cf8901b0c5c871e5b27f1f6dd
- https://github.com/siyuan-note/siyuan/commit/f8f4b517077b92c90c0d7b51ac11be1b34b273ad
- https://github.com/siyuan-note/siyuan/issues/16860
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-cv54-7wv7-qxcw
Related CVEs
Recent high-severity vulnerabilities sharing a weakness type.
Frequently asked
Is CVE-2026-23850 being actively exploited?
CVE-2026-23850 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.61%.
How severe is CVE-2026-23850?
CVE-2026-23850 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.61% probability of exploitation.
Which products are affected by CVE-2026-23850?
Affected products include B3log Siyuan.
How do I fix CVE-2026-23850?
Upgrade affected software to a fixed version, for example B3log Siyuan 3.5.4 or later, then confirm no affected versions remain in your inventory.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2026-23850 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.