Vulnerability record
CVE-2026-126266
The short answer
CVE-2026-126266 affects siyuan-note siyuan and is rated high (CVSS 8.7). It is not in CISA's Known Exploited Vulnerabilities catalog.
What it is
SiYuan from 3.6.0 before 3.8.9 contains an information disclosure vulnerability that allows unauthenticated publish visitors to bypass per-document passwords via regex search in getDoc. Attackers can send POST requests to /api/filetree/getDoc with queryMethod 3 and a broad regex to read protected body text returned in the unfiltered keywords field.
Weakness: CWE-200.
Severity
8.7 high
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/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:X/V:X/RE:X/U:X
Exploited (CISA KEV)
Not listed
CISA lists confirmed exploitation only
EPSS, next 30 days
No score
FIRST scores CVEs within a day of publication
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- None
- User interaction
- None
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Affected products
siyuan. NVD's record lists the exact affected versions.
References
Questions
Is CVE-2026-126266 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog as of 2026-11-13.
How do I fix CVE-2026-126266?
Follow the vendor advisory in the references below. NVD lists the affected versions under its configurations.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Deferred. The description is NVD's text, quoted as published.
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