CVE-2026-93922

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.81% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 56.8% of scored records. A rank, not a probability.

NVD base score

8.6 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Deferred. NVD last modified this record on 2026-09-22.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-18 23:12Z1 MO AGO

Last updated

2026-09-22 15:53Z1 MO AGO

Reserved

2026-09-18

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

High (CVSS 8.6)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Weaknesses

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base

Data version

5.2

Document digest

b9c069822d896947154681a9019ff38104d48380fa1b1f7c26339e65ece9f5d9

• github.comGitHub Security Advisory (GHSA-8c2m-33v9-vvqm)https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8c2m-33v9-vvqmvendor-advisory
• github.comhttps://github.com/siyuan-note/siyuanproduct
• github.comhttps://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/mount.ts#L72technical-description
• github.comhttps://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/file.go#L2446-L2454technical-description
• www.vulncheck.comVulnCheck Advisory: SiYuan through 3.8.4 Stored XSS via notebook nameshttps://www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-notebook-namesthird-party-advisory