CVE-2026-87807

siyuan before v3.8.2 SQL Injection via fullTextSearchBlock

siyuan versions before v3.8.2 contain an authenticated SQL injection vulnerability in the fullTextSearchBlock endpoint's method=1 query parameter. Attackers can inject UNION SELECT statements to read the entire blocks table, bypassing publish-access controls and exposing all document content and sensitive attributes.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

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Siyuan Siyuan

CVE-2026-87808

SiYuan before v3.8.2 Read-Only Boundary Bypass via fullTextSearchBlock

SiYuan versions <= 3.8.1 contain an incomplete fix for CVE-2026-32767 (GHSA-j7wh-x834-p3r7). The prior fix (commit d5e2d0bc) added an administrator check for SQL mode (method=2) in POST /api/search/fullTextSearchBlock, but the endpoint still does not enforce the application's read-only boundary: for method=2 it forwards caller-supplied SQL to the blocks database query path without calling model.CheckReadonly or CheckReadonlyStatementInBox. As a result, when a workspace runs in read-only mode (--readonly=true), an authenticated administrator can submit arbitrary SQL through /api/search/fullTextSearchBlock and obtain raw read access to the blocks database, even though the dedicated /api/query/sql endpoint is blocked in that mode. Fixed in v3.8.2.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-87812

SiYuan before v3.8.2 Stored XSS via Bazaar iconURL

SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in Bazaar package cards where the iconURL metadata is inserted directly into HTML img src attributes without escaping. Attackers can inject malicious URLs with event handlers that execute JavaScript in the authenticated SiYuan origin when users view Bazaar listings, enabling API requests and application state manipulation.

CVSS 4.0 · 7.4 High EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-87813

SiYuan before v3.8.2 Stored XSS via unescaped asset filenames

SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in the Search Assets result list where asset filenames are interpolated into HTML without escaping. Authenticated attackers can craft asset filenames containing malicious markup that executes JavaScript in the victim's browser when searching assets, enabling same-origin API requests and application state manipulation.

CVSS 4.0 · 8.4 High EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-86192

SiYuan before v3.8.2 Information Disclosure via Attribute-View

SiYuan versions before v3.8.2 fail to properly filter private attribute-view cell values in the getAttributeViewKeys endpoint. Publish readers can retrieve hidden KeyValues payloads from rows bound to inaccessible documents, exposing private database contents without authorization.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-85581

SiYuan before v3.8.2 Denial of Service via unauthenticated UI-process registration

SiYuan before v3.8.2 contains a denial of service vulnerability in the unauthenticated /api/system/uiproc endpoint that accepts and retains attacker-controlled process identifiers without size limits or authentication. Attackers can send repeated requests with unique identifiers to exhaust process memory and degrade service availability.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-86712

SiYuan before 3.8.2 Remote Code Execution via Clipboard

SiYuan before 3.8.2 trusts the attacker-writable text/siyuan clipboard MIME type and skips sanitization in the paste handler, allowing code execution in the Node-enabled desktop renderer. Attackers can craft malicious web pages that write to the clipboard, and when pasted into SiYuan, injected scripts execute with full Node.js access through the Electron main process.

CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-86191

SiYuan before v3.8.2 Private Attribute View Key Enumeration

SiYuan versions before v3.8.2 contain an information disclosure vulnerability in the getAttributeViewKeysByID endpoint that allows publish readers to enumerate private attribute view key definitions without verifying parent database visibility. Attackers can access the endpoint to retrieve complete key schemas including sensitive field names and relation definitions from hidden databases.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-85584

SiYuan before v3.8.2 Denial of Service via Auth Throttle

SiYuan versions before v3.8.2 contain a denial of service vulnerability in the publish-service Basic Auth throttle that stores failed-attempt state using attacker-controlled usernames without enforcing capacity limits or eviction policies. Unauthenticated attackers can submit repeated authentication requests with unique invalid usernames to exhaust memory and increase synchronization overhead, degrading service availability.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-85579

SiYuan before v3.8.2 Information Disclosure via undoState

SiYuan is affected by an information disclosure vulnerability (confirmed in v3.8.1, fixed in v3.8.2) in the reader-accessible POST /api/transactions/undoState endpoint. The endpoint returns the peekMutatedRootIDs list from the global undo-log stack for a caller-supplied root ID without applying publish-access visibility filtering. An authenticated reader who knows the root ID of a visible document can obtain the internal root IDs of other documents (including private or unpublished ones) modified in the same cross-document transaction, disclosing internal identifiers and cross-document relationships. Document body contents are not directly exposed.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-85174

SiYuan before v3.8.2 API Token Exposure via Log File

SiYuan before v3.8.2 logs API tokens from query parameters in plaintext to an accessible log file when full-text search requests exceed timing thresholds. Authenticated attackers can read the log file via the getFile endpoint to recover admin API tokens and gain permanent administrative access.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-85582

SiYuan before v3.8.2 Unbounded Session Creation via Basic Auth

SiYuan versions before v3.8.2 contain an unbounded session creation vulnerability in the publish-service Basic Auth handler that allows authenticated attackers to exhaust memory. Attackers can repeatedly authenticate with valid credentials to create persistent session entries without expiry or capacity limits, causing indefinite process memory growth and denial of service.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-85585

SiYuan before v3.8.2 Unbounded Memory Consumption via ControlConcurrency

SiYuan before v3.8.2 contains an unbounded resource consumption vulnerability in the request-concurrency middleware that retains mutex entries for every unique request path without eviction. Unauthenticated attackers can send numerous unique request paths to permanently increase process memory and synchronization overhead, degrading availability.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-85580

SiYuan before v3.8.2 Path Guard Bypass via Case Mismatch

SiYuan versions before v3.8.2 contain a path guard bypass vulnerability in the MCP file-access handler that uses case-sensitive matching on Linux filesystems. Attackers can read the protected publishAccess.json file by requesting case-variant paths like PublishAccess.json to disclose sensitive publish-access configuration and metadata.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-85175

SiYuan before v3.8.2 TLS Private Key Disclosure via getFile

SiYuan versions <= 3.8.1 (fixed in v3.8.2) contain an incomplete blocklist in the IsForbiddenAbsPath() function (kernel/util/path_guard.go), which only blocks conf/conf.json by exact match and does not restrict the TLS private key (conf/key.pem) or CA private key (conf/ca.key) stored in the same conf/ directory. Because the getFile handler skips the blocklist for RoleAdministrator and all authenticated users receive RoleAdministrator in v3.8.1, any user (or any client on a default no-auth-code instance) can retrieve these private keys via POST /api/file/getFile. On deployments with TLS enabled, this allows decryption of captured HTTPS traffic (key.pem) and forging of certificates trusted by clients that imported SiYuan's CA (ca.key).

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-84803

SiYuan before v3.8.2 Stored XSS via incomplete asset blocklist

SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in asset serving due to an incomplete extension blocklist that misses script-capable file types. Attackers can upload files with extensions like .xht, .ehtml, .xsl, .xbl, or .rdf that resolve to executable media types and execute JavaScript to steal API tokens and compromise workspaces.

CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-82653

SiYuan before v3.8.1 Stored XSS via confirmDialog

SiYuan before v3.8.1 contains a stored cross-site scripting vulnerability in confirmDialog() where unescaped package names and notebook names are interpolated directly into innerHTML assignments. Attackers can submit malicious bazaar packages with HTML/script payloads in the name field that execute in users' browsers when uninstalling packages or unlocking encrypted notebooks.

CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-82654

SiYuan before v3.8.1 Stored XSS via block name

SiYuan before v3.8.1 fails to properly escape block name, alias, and memo fields in hint, backlink, and breadcrumb rendering functions. Attackers can set a block's name to contain HTML/script tags that execute when another user views documents referencing or displaying that block.

CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-82649

SiYuan before 3.8.1 Local Privilege Escalation via Uncontrolled Search Path

SiYuan Windows installer before version 3.8.1 (affected versions >= 2.0.14) contains an uncontrolled search path element vulnerability in its NSIS installer, which invokes system executables such as TASKKILL by name rather than by absolute path. Because NSIS nsExec::Exec resolves these calls using a search path that includes the installer's own launch directory ahead of System32, an attacker who plants a malicious executable (e.g., a renamed TASKKILL.exe) in that directory can have it executed when the installer runs. These calls occur in electron-builder's preInit hook before the license page is displayed, and with an all-users (elevated) install the planted binary executes with an elevated token, resulting in local privilege escalation.

CVSS 4.0 · 7 High EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan

CVE-2026-82233

SiYuan before v3.8.1 Path Traversal via asset.upload

SiYuan before v3.8.1 contains a path traversal vulnerability in the asset.upload MCP tool that accepts arbitrary absolute file paths without workspace boundary validation. Attackers can induce the AI Agent to upload sensitive files such as SSH keys or credentials from outside the workspace into the asset directory through prompt injection.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

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B3log Siyuan

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Siyuan Siyuan