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CVE-2026-74868

SiYuan before 3.7.4 Brute-Force Authentication via Publish Service

SiYuan versions before 3.7.4 contain an unthrottled brute-force vulnerability in the Publish Service Basic Auth implementation (PublishServiceTransport.RoundTrip() in kernel/server/proxy/publish.go). The Publish Service runs on a separate, unauthenticated-by-default listener (default TCP port 6808) and gates named publish-viewer accounts (Conf.Publish.Auth.Accounts) with Basic Auth that has no rate limiting, per-account lockout, or backoff. Unauthenticated remote attackers can submit unlimited password guesses against named accounts to gain access to published notes/notebooks.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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Siyuan Siyuan
CVE-2026-74903

SiYuan before v3.7.4 Insufficient Access Control via spinBlockDOM

SiYuan before v3.7.4 contains an insufficient access control vulnerability in the /api/lute/spinBlockDOM endpoint, which is guarded only by CheckAuth middleware instead of CheckAdminRole like its sibling endpoint. Authenticated users with RoleEditor or RoleReader roles can invoke the endpoint to transform arbitrary DOM input, and large payloads cause endpoint starvation through per-path mutex serialization.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
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B3log Siyuan
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Siyuan Siyuan
CVE-2026-74904

SiYuan before v3.7.4 Missing Authorization via block API

SiYuan before v3.7.4 is missing authorization checks in 17 block metadata/content endpoints in kernel/api/block.go (including getRefText, checkBlockExist, and getBlockBreadcrumb). These handlers are gated only by basic authentication (model.CheckAuth) and lack publish-access filtering, allowing anonymous publish-mode readers to disclose private block content-derived text, structural metadata, and existence information for arbitrary block IDs across the workspace.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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Siyuan Siyuan
CVE-2026-74905

SiYuan before v3.7.4 SSRF via IPv6 Transition Address Bypass

SiYuan before v3.7.4 contains a server-side request forgery (SSRF) vulnerability in the isPrivateIP function in kernel/util/net.go, used by SSRFSafeDialer to enforce SSRF protection in SafeMode. The function only checks for loopback, link-local unicast, private, and unspecified addresses and does not recognize IPv6 transition addresses (NAT64 64:ff9b::/96, 6to4 2002::/16, Teredo 2001::/32) that embed private IPv4 destinations. When SafeMode is enabled, an authenticated attacker can bypass the SSRF guard via the network forward proxy, WebSocket proxy, or SSE proxy endpoints by supplying a URL whose hostname resolves to such a transition address, reaching internal services and cloud metadata endpoints (e.g., 169.254.169.254). Because the forward proxy returns the full response body, this is a full-read SSRF that can be used to steal instance credentials, reach internal services, and port-scan internal infrastructure.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
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B3log Siyuan
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Siyuan Siyuan
CVE-2026-74906

SiYuan before v3.7.4 Incorrect Authorization via Publish Access

SiYuan before v3.7.4 contains an incorrect authorization vulnerability in eight publish-mode reader-facing endpoints that filter results using the visibility list instead of the disabled list. Anonymous visitors can discover and read content from documents explicitly marked as forbidden from publishing by accessing search, backlink, asset content, saved criteria, recent documents, graph, and tag endpoints.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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B3log Siyuan
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Siyuan Siyuan
CVE-2026-75916

SiYuan XSS-to-RCE via unescaped block metadata in hint popup

SiYuan through 3.7.3 contains a cross-site scripting vulnerability in the '((' block-reference autocomplete hint popup. In genHintItemHTML() (app/src/protyle/hint/extend.ts), a candidate block's name, alias, and memo fields are concatenated into the popup's HTML without escaping. An attacker who can set these metadata fields on a block can inject a self-firing payload (e.g. <img src=x onerror=...>) that executes automatically when a victim types '((' followed by a search term that surfaces the crafted block. Because SiYuan's Electron windows run with nodeIntegration enabled, contextIsolation disabled, and no CSP, the injected script gains require('child_process') access, allowing the XSS to escalate to arbitrary OS command execution.

CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Vendors
B3log
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Siyuan
CVE-2026-73053

SiYuan before v3.7.4 Cross-Site Scripting via unicode2Emoji

SiYuan versions before v3.7.4 contain a cross-site scripting vulnerability in the unicode2Emoji function that fails to sanitize codepoint branch output. Attackers can craft document icons with hex-encoded markup that executes in the renderer with Node integration enabled, achieving arbitrary code execution on the host system.

CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-73045

SiYuan before 3.7.4 Brute-Force via authFilePublishAccess

SiYuan before 3.7.4 contains an improper restriction of excessive authentication attempts vulnerability in the authFilePublishAccess endpoint that allows unauthenticated attackers to brute-force per-notebook publish passwords. Attackers can submit unbounded password guesses without rate limiting or CAPTCHA to gain access to password-protected published notebooks.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-72810

SiYuan before v3.7.4 Publish-Boundary Bypass via WebSocket

SiYuan versions before v3.7.4 contain a publish-boundary bypass vulnerability in WebSocket broadcast sessions that allows anonymous readers to receive unfiltered edits. Attackers can establish a WebSocket connection to the publish surface and passively receive real-time content events including password-protected and forbidden documents without authentication.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-73049

SiYuan before v3.7.4 Information Disclosure via getAttributeViewBacklinks

SiYuan versions before v3.7.4 contain an information disclosure vulnerability in the getAttributeViewBacklinks endpoint that consults the forbidden access list instead of the visibility list when filtering backlinks. Anonymous readers can supply a publicly visible database row identifier to discover hidden-tier documents that reference it, receiving the database name, row title, and document path of hidden documents.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
B3log Siyuan
Products
Siyuan Siyuan
CVE-2026-73056

SiYuan kernel before 3.7.4 Unthrottled Brute-Force via API Token

SiYuan kernel versions before 3.7.4 contain an improper restriction of excessive authentication attempts vulnerability in the CheckAuth() middleware. The middleware accepts the API token (Conf.Api.Token) via an Authorization header (Token/Bearer) or a ?token= query parameter, and neither path is protected by the application's CAPTCHA/lockout mechanism (NeedCaptcha/WrongAuthCount). As a result, an unauthenticated remote attacker can perform unlimited automated guesses of the API token, particularly when a short or weak custom token has been configured, and upon success gains full RoleAdministrator access enabling arbitrary file operations and SQL queries.

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