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CVE-2026-73044

SiYuan before v3.7.4 Stored Cross-Site Scripting via Column Width

SiYuan versions before v3.7.4 fail to validate or escape table column width values, allowing stored cross-site scripting injection into style attributes. Attackers can inject malicious payloads through the setAttrViewColWidth API that break out of style attributes and inject event handlers on every table cell, executing arbitrary code in the Electron renderer with Node integration enabled.

CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-73054

SiYuan before v3.7.4 Authentication Bypass via WebSocket

SiYuan versions before v3.7.4 contain an authentication bypass vulnerability in the WebSocket endpoint caused by differential parsing of query parameters between authentication exemption and session quarantine checks. Unauthenticated attackers can craft a malicious WebSocket URI with duplicated query parameters to bypass access auth code validation and receive the live kernel event stream including document identifiers, titles, and operation logs.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-73052

SiYuan before v3.7.4 Stored XSS via Attribute-View Field Names

SiYuan before v3.7.4 stores attribute-view field names without HTML escaping and interpolates them directly into option elements via innerHTML in the sort menu. Attackers can inject markup by renaming a database field to execute arbitrary JavaScript when users open the sort menu, with Node integration enabled in the desktop client enabling code execution.

CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-73046

SiYuan before v3.7.4 Authentication Bypass via HTTP Basic Auth

SiYuan before v3.7.4 improperly restricts excessive authentication attempts in the CheckAuth() middleware. The HTTP Basic Authentication branch, which guards nearly the entire /api/* surface, accepts the workspace access code (Conf.AccessAuthCode) as the Basic Auth password but never consults the CAPTCHA/lockout gate or increments the failure counter used by the cookie/session login path. This allows unauthenticated remote attackers to brute-force the admin access code with unlimited automated requests and obtain full RoleAdministrator access to the kernel. A secondary weakness exists because the access code is compared using a non-constant-time string comparison.

CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-73041

SiYuan before v3.7.4 Remote Code Execution via PDF Annotations

SiYuan versions before v3.7.4 fail to validate or escape annotation fields written to disk by the setFileAnnotation endpoint. Attackers can inject malicious markup into annotation fields that execute as script in the PDF renderer with full Node.js access when a user opens an annotated PDF.

CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-73050

SiYuan before v3.7.4 Stored XSS via select option color

SiYuan versions before v3.7.4 fail to validate or escape the color field in attribute-view select options, allowing stored cross-site scripting through eight unescaped render sites. Attackers can inject event-handler attributes by including quotation marks in the color value, executing arbitrary JavaScript when viewing databases containing the malicious select field.

CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-72812

SiYuan before v3.7.4 Missing Authorization via refreshBacklink

SiYuan versions before v3.7.4 contain a missing authorization vulnerability in the /api/ref/refreshBacklink endpoint that allows anonymous readers to trigger persistent server-side writes. Attackers can invoke the endpoint with an attacker-controlled block ID to flush transaction queues, scan all references globally, and enqueue database writes, bypassing read-only protections and enabling resource amplification attacks.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-73607

SiYuan before v3.7.4 Information Disclosure via getOutlineStorage

SiYuan versions before v3.7.4 contain an information disclosure vulnerability in the /api/storage/getOutlineStorage endpoint that performs no authorization checks. Attackers can retrieve outline state including heading identifiers for any document by supplying its identifier, even for documents forbidden to the requester.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-72801

SiYuan before v3.7.4 Information Disclosure via Encryption Key Material

SiYuan versions before v3.7.4 disclose encrypted-notebook key-derivation material and wrapped data keys through unauthenticated endpoints in publish mode. Attackers can retrieve Argon2id salt, cost parameters, password verifiers, and wrapped notebook keys to perform unlimited offline master-password cracking without rate limiting.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-72793

SiYuan before v3.7.4 Information Disclosure via /api/system/getConf

SiYuan versions before v3.7.4 fail to mask sensitive configuration fields in the /api/system/getConf endpoint, allowing anonymous or publish-reader users to obtain the session-cookie signing key, OS username via pandoc path, and encrypted-notebook key material. Attackers can forge and tamper with session cookies to impersonate users, and on instances without access-auth codes configured, escalate to administrator privileges.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-72789

SiYuan before v3.7.4 Authentication Bypass via Encrypted Notebooks

SiYuan before v3.7.4 fails to properly validate publish access for encrypted notebooks, treating them as publicly accessible by default. Anonymous readers can enumerate and retrieve fully decrypted document content from unlocked encrypted notebooks through the publish API without authentication or key material.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-73609

SiYuan before v3.7.4 Information Disclosure via getBookmarkLabels

SiYuan versions before v3.7.4 contain an information disclosure vulnerability in the getBookmarkLabels endpoint that returns all bookmark labels in the workspace without publish-access filtering. Anonymous readers and publish-mode readers can obtain the complete bookmark vocabulary across the workspace, disclosing subject matter and organizational information from inaccessible documents.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-73605

SiYuan before v3.7.4 Path Traversal via getUniqueFilename

SiYuan versions before v3.7.4 contain a path traversal vulnerability in the getUniqueFilename endpoint that allows anonymous readers to probe filesystem existence without validation or confinement. Attackers can supply arbitrary absolute paths to determine whether files and directories exist on the host, enabling reconnaissance of the filesystem layout and installed software.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-72799

SiYuan before v3.7.4 Information Disclosure via Path Resolution

SiYuan before v3.7.4 (affected <=v3.7.2) fails to enforce publish-access filters on five filetree path-resolution endpoints (getFullHPathByID, getHPathByID, getPathByID, getIDsByHPath, and getHPathByPath). In publish mode, when Publish.Auth.Enable is false, an unauthenticated (anonymous) reader — or any publish reader token — can call these endpoints to enumerate the complete private document tree, mapping notebook names, folder hierarchies, and document titles, and resolving title paths to document IDs, including for documents marked hidden, password-protected, or publish-forbidden.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-73610

SiYuan before v3.7.4 Information Disclosure via Local Storage

SiYuan before v3.7.4 contains an information disclosure vulnerability in the local storage filter that returns the administrator's entire storage map with only three keys sanitized. Unauthenticated attackers or publish readers can retrieve closed-tab history, search keywords, private document identifiers, and expanded folder paths by calling the getLocalStorage endpoint.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-73606

SiYuan before v3.7.4 Information Disclosure via getRefIDs

SiYuan versions before v3.7.4 contain an information disclosure vulnerability in the /api/block/getRefIDs endpoint that fails to check password-protected document tiers. Unauthenticated readers can discover that password-protected documents reference specific blocks and obtain block identifiers without entering the document password.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-72808

SiYuan before v3.7.4 Information Disclosure via getFileAnnotation

SiYuan versions up to and including v3.7.2 (fixed in v3.7.4) contain an information disclosure vulnerability in the /api/asset/getFileAnnotation endpoint, which returns .sya PDF-annotation file content without a publish-access check. Because the endpoint is gated only by CheckAuth (unlike the /assets/* route, which enforces publish access and password), an anonymous reader (when publish authentication is disabled) or any publish RoleReader who knows an asset path can read the private PDF annotations (highlights and notes) of publish-forbidden, password-protected, or unpublished documents. The issue is limited to non-encrypted notebooks; encrypted-box annotations are not exposed.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-72807

SiYuan before v3.7.4 SQL Injection via queryBlocks template

SiYuan versions before v3.7.4 contain a second-order SQL injection vulnerability in attribute-view template columns that expose the queryBlocks function, which executes raw SQL using string substitution instead of parameterized queries. Attackers can distribute malicious SiYuan documents or packages with crafted template columns that execute arbitrary SQL on a victim's kernel when the package is imported and rendered, enabling read and write access across notebooks.

CVSS 4.0 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-72806

SiYuan before v3.7.4 Authentication Bypass via Attribute View

SiYuan versions before v3.7.4 contain an authentication bypass vulnerability in the FilterViewByPublishAccess filter that fails to check publish password protection when rendering attribute views and database rows. Unauthenticated readers can access password-protected document rows including titles, block IDs, and column values by calling renderAttributeView without supplying the required password.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-72804

SiYuan before v3.7.4 Authentication Bypass via Graph Endpoints

SiYuan versions before v3.7.4 fail to validate publish-password tier in getGraph and getLocalGraph endpoints, allowing anonymous readers to retrieve block-level content of password-protected documents. Attackers can call these endpoints without supplying a password to read protected document content and the complete reference topology.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan