CVE-2026-66012

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.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• 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

0.76% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 55.1% of scored records. A rank, not a probability.

NVD base score

10.0 (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:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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 2026-10-24.

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

2026-07-25 10:45Z3 MO AGO

Last updated

2026-09-17 17:54Z1 MO AGO

Reserved

2026-07-23

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Critical (CVSS 10.0)

CNA CVSS vector

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

Weaknesses

• CWE-862Missing AuthorizationClass

Data version

5.2

Document digest

d307aef872298f6686c3f9a97d60b92195e6ba6b02dc918c61d4cc575bff7bf9

• github.comGitHub Security Advisory (GHSA-cvhv-7xhj-xjp8)https://github.com/siyuan-note/siyuan/security/advisories/GHSA-cvhv-7xhj-xjp8vendor-advisory
• github.comhttps://github.com/siyuan-note/siyuan/commit/c72ca4cd09019e5f64afdee8f8c6ec5ef34858dbpatch
• www.vulncheck.comVulnCheck Advisory: SiYuan before v3.7.2 Unauthenticated Administrator Takeover via MCPhttps://www.vulncheck.com/advisories/siyuan-before-unauthenticated-administrator-takeover-via-mcpthird-party-advisory