Security readout for executives and security teams
Plain-English summary
SiYuan publish-mode users may retrieve documents intentionally excluded from publishing. On versions before 3.7.3, direct requests to two backlink-content endpoints can expose rendered document content. Anonymous access is possible when publish Basic Auth is disabled. Confidential notes, credentials, personal information, or internal business material could therefore be disclosed.
Executive priority
Treat internet-accessible publish-mode deployments below 3.7.3 as an urgent confidentiality risk. Upgrade promptly, prioritizing instances without publish Basic Auth or containing sensitive unpublished notes. Because the bundle provides no evidence of active exploitation, incident escalation should depend on log findings and evidence of unauthorized access.
Technical view
The affected endpoints, /api/ref/getBacklinkDoc and /api/ref/getBackmentionDoc, enforce CheckAuth but omit publish-access filtering. A publish-mode reader who supplies a publish-forbidden document ID can retrieve rendered DOM content and test whether that document references a specified block. This is an authorization failure classified as CWE-862.
Likely exposure
SiYuan deployments before version 3.7.3 using publish mode are potentially exposed. Risk is greatest for internet-accessible deployments without publish Basic Auth, where anonymous readers may reach the endpoints. Basic Auth reduces anonymous exposure but does not address access by authenticated publish-mode readers. Exploitation also requires a target document ID.
Exploitation context
The supplied sources do not establish active exploitation, and the CVE is not listed as KEV in the bundle. Exploitation is network-accessible, low-complexity, and requires no privileges when publish Basic Auth is disabled. The impact is confidentiality loss; the supplied CVSS 4.0 score is 9.2.
Researcher notes
The authorization inconsistency is between filtered backlink-list endpoints and content-returning endpoints guarded only by CheckAuth. Assessment should cover both affected routes, anonymous and authenticated publish-mode contexts, rendered-content disclosure, and the reference-existence oracle. Avoid concluding that unpublished data was accessed without corroborating logs or other evidence.
Mitigation direction
- Upgrade SiYuan to version 3.7.3 or later after reviewing the vendor advisory.
- Until upgraded, restrict publish-mode access to trusted users and networks.
- Enable publish Basic Auth to reduce anonymous exposure; do not treat it as a complete fix.
- Review published and publish-forbidden documents for sensitive content.
Validation and detection
- Inventory SiYuan deployments and confirm their exact running versions.
- Identify deployments using publish mode and whether publish Basic Auth is disabled.
- Verify version 3.7.3 or later is deployed on every exposed instance.
- Using an authorized test account, confirm publish-forbidden documents cannot be retrieved through the affected endpoints.
- Review access logs for unexpected requests to both affected API paths.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-862: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-68586 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.2 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N——VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N3.94VulnCheckVulnerability scoring details
Base CVSS 4.0 score
9.2CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
Base CVSS 3.1 score
8.6HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- GitHub Security Advisory (GHSA-36v8-mpjm-8j5r)CVE reference, VulnCheck · vendor-advisory
- VulnCheck Advisory: SiYuan before v3.7.3 Content Disclosure via getBacklinkDocCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Missing Authorization
Missing Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.