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CVE-2026-50551

SiYuan: Stored XSS to RCE via Unsanitized Attribute View Asset Cell Content

9.9 CriticalFix available

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, SiYuan contains a stored cross-site scripting (XSS) vulnerability in the Attribute View (database) asset cell renderer that escalates to remote code execution (RCE) in the Electron desktop client. This vulnerability is fixed in 3.7.0.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.56%Up 0.3 points since Jun 12, 2026
90%50%10%1%

What each source reports

CVE List Score used 9.9

SiYuan: Stored XSS to RCE via Unsanitized Attribute View Asset Cell Content

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, SiYuan contains a stored cross-site scripting (XSS) vulnerability in the Attribute View (database) asset cell renderer that escalates to remote code execution (RCE) in the Electron desktop client. This vulnerability is fixed in 3.7.0.

Record
CVE-2026-50551
CVSS 3.1
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-79
Updated
2026-11-02
EUVDEUVD-2026-39128 9.9

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, SiYuan contains a stored cross-site scripting (XSS) vulnerability in the Attribute View (database) asset cell renderer that escalates to remote code execution (RCE) in the Electron desktop client. This vulnerability is fixed in 3.7.0.

Record
EUVD-2026-39128
CVSS 3.1
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-56mp-4f3v-fgj2 9.9

SiYuan: Stored XSS to RCE via Unsanitized Attribute View Asset Cell Content

SiYuan v3.6.5 and earlier versions contain a stored cross-site scripting (XSS) vulnerability in the Attribute View (database) asset cell renderer that escalates to remote code execution (RCE) in the Electron desktop client. This is a neighbor-bug of CVE-2026-44588: the fix for -44588 used escapeAriaLabel() (double-escapes <), but the AV asset renderers were left using the weaker escapeAttr() (escapes only quotes) or no escaping at all.

Vulnerability Details

The Electron renderer is configured with nodeIntegration: true and contextIsolation: false (app/electron/main.js:307), allowing any JavaScript executing in the renderer to directly access Node.js APIs including require('child_process').

Two XSS sinks exist.

Sink 1 (Direct Stored XSS - triggers on page load)

app/src/protyle/render/av/cell.ts:1008:

  text += `<span class="b3-chip av__celltext--url ariaLabel" aria-label="${escapeAttr(item.content)}" data-name="${escapeAttr(item.name)}"

data-url="${escapeAttr(item.content)}">${item.name || item.content}</span>`;

The >${item.name || item.content}</span> portion is raw user input with zero escaping.

app/src/protyle/render/av/blockAttr.ts:93 (even worse - completely unescaped):

  html += `<img loading="lazy" class="av__cellassetimg ariaLabel" aria-label="${item.content}" src="${getCompressURL(item.content)}">`;

Rendered via action.ts:860: cellElement.innerHTML = renderCell(...) results in immediate XSS on page load.

Sink 2 (Hover-triggered XSS via aria-label round-trip)

  • Same lines emit aria-label="${escapeAttr(item.content)}" on .ariaLabel elements.
  • escapeAttr() (util/escape.ts:14) escapes only " and ' — NOT < or >.
  • popover.ts:33 global mouseover handler reads aria-label via getAttribute (which attribute-decodes entities).
  • Line 144: showTooltip(decodeURIComponent(tip), ...) then tooltip.ts:41: messageElement.innerHTML = message results in XSS on hover.

Source

  • app/src/protyle/render/av/asset.ts:405: addAssetLink() reads user input from a free-form <textarea> with no sanitization.
  • Kernel stores MAsset.Content raw (kernel/av/value.go:53), no server-side sanitization.

Attack Vector

  1. Attacker creates a malicious note containing an Attribute View (database).
  2. Attacker adds an asset cell with link content: <img src=x onerror=require('child_process').exec('calc')>
  3. Victim opens the note for immediate RCE (Sink 1), or hovers over the cell for RCE (Sink 2).
  4. In a sync/collaboration scenario, the malicious note propagates to all users.

Proof of Concept

Payload (Direct XSS) — in an AV asset cell link field, enter:

  <img src=x onerror=alert(document.domain)>

For RCE in Electron desktop:

  <img src=x onerror=require('child_process').exec('calc')>

Steps to Reproduce

  1. Open SiYuan desktop app (v3.6.5).
  2. Create a new document.
  3. Insert an Attribute View (database): / then select "Table".
  4. Add a column of type "Asset".
  5. Click the asset cell, then "Add Link".
  6. In the "Link" textarea, paste: <img src=x onerror=alert(1)>
  7. Leave "Title" empty or fill with benign text.
  8. Click outside the dialog to save.
  9. Observe: Alert fires immediately (Sink 1). Hovering over the cell also triggers (Sink 2).

Impact

  • Remote Code Execution on victim's system via malicious note sync/import.
  • Data exfiltration: attacker can read all notes, access filesystem, steal credentials.
  • Persistence: malicious payload stored in .sy files, executes on every open.

Suggested Fix

  1. Replace escapeAttr() with escapeAriaLabel() for all aria-label attributes in AV cell renderers.
  2. Escape item.name and item.content with escapeHtml() before concatenating into element text content.

Affected files: app/src/protyle/render/av/cell.ts, app/src/protyle/render/av/blockAttr.ts, app/src/protyle/render/av/asset.ts.

…

Record
GHSA-56mp-4f3v-fgj2
CVSS 3.1
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-79
Updated
2026-11-02
NVD 9.9

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, SiYuan contains a stored cross-site scripting (XSS) vulnerability in the Attribute View (database) asset cell renderer that escalates to remote code execution (RCE) in the Electron desktop client. This vulnerability is fixed in 3.7.0.

Record
CVE-2026-50551
CVSS 3.1
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-79
Updated
2026-11-02
OSV 9.9

SiYuan: Stored XSS to RCE via Unsanitized Attribute View Asset Cell Content

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, SiYuan contains a stored cross-site scripting (XSS) vulnerability in the Attribute View (database) asset cell renderer that escalates to remote code execution (RCE) in the Electron desktop client. This vulnerability is fixed in 3.7.0.

Record
CVE-2026-50551
CVSS 3.1
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-79
Updated
2026-11-02
OSVGHSA-56mp-4f3v-fgj2 9.9

SiYuan: Stored XSS to RCE via Unsanitized Attribute View Asset Cell Content

SiYuan v3.6.5 and earlier versions contain a stored cross-site scripting (XSS) vulnerability in the Attribute View (database) asset cell renderer that escalates to remote code execution (RCE) in the Electron desktop client. This is a neighbor-bug of CVE-2026-44588: the fix for -44588 used escapeAriaLabel() (double-escapes <), but the AV asset renderers were left using the weaker escapeAttr() (escapes only quotes) or no escaping at all.

Vulnerability Details

The Electron renderer is configured with nodeIntegration: true and contextIsolation: false (app/electron/main.js:307), allowing any JavaScript executing in the renderer to directly access Node.js APIs including require('child_process').

Two XSS sinks exist.

Sink 1 (Direct Stored XSS - triggers on page load)

app/src/protyle/render/av/cell.ts:1008:

  text += `<span class="b3-chip av__celltext--url ariaLabel" aria-label="${escapeAttr(item.content)}" data-name="${escapeAttr(item.name)}"

data-url="${escapeAttr(item.content)}">${item.name || item.content}</span>`;

The >${item.name || item.content}</span> portion is raw user input with zero escaping.

app/src/protyle/render/av/blockAttr.ts:93 (even worse - completely unescaped):

  html += `<img loading="lazy" class="av__cellassetimg ariaLabel" aria-label="${item.content}" src="${getCompressURL(item.content)}">`;

Rendered via action.ts:860: cellElement.innerHTML = renderCell(...) results in immediate XSS on page load.

Sink 2 (Hover-triggered XSS via aria-label round-trip)

  • Same lines emit aria-label="${escapeAttr(item.content)}" on .ariaLabel elements.
  • escapeAttr() (util/escape.ts:14) escapes only " and ' — NOT < or >.
  • popover.ts:33 global mouseover handler reads aria-label via getAttribute (which attribute-decodes entities).
  • Line 144: showTooltip(decodeURIComponent(tip), ...) then tooltip.ts:41: messageElement.innerHTML = message results in XSS on hover.

Source

  • app/src/protyle/render/av/asset.ts:405: addAssetLink() reads user input from a free-form <textarea> with no sanitization.
  • Kernel stores MAsset.Content raw (kernel/av/value.go:53), no server-side sanitization.

Attack Vector

  1. Attacker creates a malicious note containing an Attribute View (database).
  2. Attacker adds an asset cell with link content: <img src=x onerror=require('child_process').exec('calc')>
  3. Victim opens the note for immediate RCE (Sink 1), or hovers over the cell for RCE (Sink 2).
  4. In a sync/collaboration scenario, the malicious note propagates to all users.

Proof of Concept

Payload (Direct XSS) — in an AV asset cell link field, enter:

  <img src=x onerror=alert(document.domain)>

For RCE in Electron desktop:

  <img src=x onerror=require('child_process').exec('calc')>

Steps to Reproduce

  1. Open SiYuan desktop app (v3.6.5).
  2. Create a new document.
  3. Insert an Attribute View (database): / then select "Table".
  4. Add a column of type "Asset".
  5. Click the asset cell, then "Add Link".
  6. In the "Link" textarea, paste: <img src=x onerror=alert(1)>
  7. Leave "Title" empty or fill with benign text.
  8. Click outside the dialog to save.
  9. Observe: Alert fires immediately (Sink 1). Hovering over the cell also triggers (Sink 2).

Impact

  • Remote Code Execution on victim's system via malicious note sync/import.
  • Data exfiltration: attacker can read all notes, access filesystem, steal credentials.
  • Persistence: malicious payload stored in .sy files, executes on every open.

Suggested Fix

  1. Replace escapeAttr() with escapeAriaLabel() for all aria-label attributes in AV cell renderers.
  2. Escape item.name and item.content with escapeHtml() before concatenating into element text content.

Affected files: app/src/protyle/render/av/cell.ts, app/src/protyle/render/av/blockAttr.ts, app/src/protyle/render/av/asset.ts.

…

Record
GHSA-56mp-4f3v-fgj2
CVSS 3.1
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-79
Updated
2026-11-02
OSVGO-2026-5967 No score

SiYuan: Stored XSS to RCE via Unsanitized Attribute View Asset Cell Content in github.com/siyuan-note/siyuan/kernel

SiYuan: Stored XSS to RCE via Unsanitized Attribute View Asset Cell Content in github.com/siyuan-note/siyuan/kernel

Record
GO-2026-5967
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/siyuan-note/siyuan/kernel
Go
 before 0.0.0-20260628153353-2d5d72223df4
0.0.0-20260628153353-2d5d72223df4
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
 before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-50551 is a critical vulnerability (CVSS 9.9) in Siyuan-note Siyuan, published June 24, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.56%, the 46th percentile. Fixed in github.com/siyuan-note/siyuan/kernel 0.0.0-20260628153353-2d5d72223df4.

References

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