CVE-2026-54759
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedSiYuan is an open-source personal knowledge management system. Prior to 3.7.0, Lute's HTML sanitizer does not remove <iframe> elements. Combined with the SiYuan Electron client's permissive security configuration, an attacker can include a malicious <iframe> in a Bazaar package README that executes arbitrary commands on the victim's machine when the package details are viewed. No package installation is required. This vulnerability is fixed in 3.7.0.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceSiYuan personal knowledge management system versions prior to 3.7.0 contain a vulnerability where Lute's HTML sanitizer fails to remove <iframe> elements. When combined with permissive security settings in the Electron client, attackers can embed malicious <iframe> tags in Bazaar package README files that execute arbitrary commands on victims' machines simply by viewing package details—no installation required.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- Authentication
- X
- User interaction
- P
- Scope
- X
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/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
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check SiYuan versionOpen the SiYuan application and navigate to Help > About, or check the version displayed in the application's title bar or settings panelAffected if The version shown is prior to 3.7.0 (for example, 3.6.x, 3.5.x, etc.)
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Confirm Electron client usageDetermine if you are running the desktop Electron version of SiYuan rather than the browser or mobile version, check the application's window chrome and About dialog for Electron indicatorsAffected if You are using the Electron-based desktop client (the vulnerability requires permissive Electron security settings)
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Verify Bazaar package accessOpen the Bazaar marketplace panel within SiYuan and view the details of any installed or browsed packageAffected if You view package README files in Bazaar (the attack triggers simply by viewing, not installing)
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Inspect HTML rendering behaviorView a Bazaar package README that contains HTML content and inspect whether iframe elements render or load contentAffected if iframe elements are visible or active within package READMEs (indicates the sanitizer is not stripping them)
You are affected if you run SiYuan versions before 3.7.0 using the Electron desktop client and view Bazaar package READMEs, as the unsanitized iframe tags can execute arbitrary commands.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedUpgrade SiYuan to version 3.7.0 or later, which includes the fixed HTML sanitizer that properly removes iframe elements.
3.7.0
- Upgrade SiYuan to version 3.7.0 or later to receive the fixed Lute HTML sanitizer that removes iframe elements
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,696.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-54759 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-54759 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data