{
"document": {
"category": "csaf_base",
"csaf_version": "2.0",
"distribution": {
"tlp": {
"label": "WHITE"
}
},
"lang": "en",
"notes": [
{
"category": "legal_disclaimer",
"text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
}
],
"publisher": {
"category": "coordinator",
"contact_details": "cert@ncsc.nl",
"name": "National Cyber Security Centre",
"namespace": "https://www.ncsc.nl/"
},
"title": "CVE-2026-34448",
"tracking": {
"current_release_date": "2026-04-03T17:26:05.698530Z",
"generator": {
"date": "2026-02-17T15:00:00Z",
"engine": {
"name": "V.E.L.M.A",
"version": "1.7"
}
},
"id": "CVE-2026-34448",
"initial_release_date": "2026-03-31T22:25:20.783361Z",
"revision_history": [
{
"date": "2026-03-31T22:25:20.783361Z",
"number": "1",
"summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)."
},
{
"date": "2026-03-31T22:25:23.617818Z",
"number": "2",
"summary": "NCSC Score created."
},
{
"date": "2026-03-31T22:40:13.449181Z",
"number": "3",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (3).| CWES updated (1)."
},
{
"date": "2026-03-31T22:40:15.812699Z",
"number": "4",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-31T23:58:21.096770Z",
"number": "5",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)."
},
{
"date": "2026-03-31T23:58:23.784596Z",
"number": "6",
"summary": "NCSC Score updated."
},
{
"date": "2026-04-01T07:49:55.769267Z",
"number": "7",
"summary": "NCSC Score updated."
},
{
"date": "2026-04-01T15:06:40.006110Z",
"number": "8",
"summary": "Source connected.| CVE status created. (valid)| EPSS created."
},
{
"date": "2026-04-01T15:07:57.904020Z",
"number": "9",
"summary": "NCSC Score updated."
},
{
"date": "2026-04-03T16:39:17.691573Z",
"number": "10",
"summary": "Unknown change."
},
{
"date": "2026-04-03T16:39:21.188132Z",
"number": "11",
"summary": "NCSC Score updated."
},
{
"date": "2026-04-03T17:25:57.771332Z",
"number": "12",
"summary": "Products connected (1).| Product Identifiers created (1).| Exploits created (1)."
},
{
"date": "2026-04-03T17:26:02.524641Z",
"number": "13",
"summary": "NCSC Score updated."
}
],
"status": "interim",
"version": "13"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "vers:unknown/<3.6.2",
"product": {
"name": "vers:unknown/<3.6.2",
"product_id": "CSAFPID-5899391",
"product_identification_helper": {
"cpe": "cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*"
}
}
}
],
"category": "product_name",
"name": "siyuan"
}
],
"category": "vendor",
"name": "B3log"
},
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "vers:unknown/<3.6.2",
"product": {
"name": "vers:unknown/<3.6.2",
"product_id": "CSAFPID-5878158"
}
}
],
"category": "product_name",
"name": "siyuan"
}
],
"category": "vendor",
"name": "siyuan-note"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-34448",
"cwe": {
"id": "CWE-79",
"name": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"
},
"notes": [
{
"category": "description",
"text": "SiYuan is a personal knowledge management system. Prior to version 3.6.2, an attacker who can place a malicious URL in an Attribute View mAsse field can trigger stored XSS when a victim opens the Gallery or Kanban view with “Cover From -> Asset Field” enabled. The vulnerable code accepts arbitrary http(s) URLs without extensions as images, stores the attacker-controlled string in coverURL, and injects it directly into an ![](\"...\")
attribute without escaping. In the Electron desktop client, the injected JavaScript executes with nodeIntegration enabled and contextIsolation disabled, so the XSS reaches arbitrary OS command execution under the victim’s account. This issue has been patched in version 3.6.2.",
"title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-34448"
},
{
"category": "description",
"text": "SiYuan is a personal knowledge management system. Prior to version 3.6.2, an attacker who can place a malicious URL in an Attribute View mAsse field can trigger stored XSS when a victim opens the Gallery or Kanban view with “Cover From -> Asset Field” enabled. The vulnerable code accepts arbitrary http(s) URLs without extensions as images, stores the attacker-controlled string in coverURL, and injects it directly into an attribute without escaping. In the Electron desktop client, the injected JavaScript executes with nodeIntegration enabled and contextIsolation disabled, so the XSS reaches arbitrary OS command execution under the victim’s account. This issue has been patched in version 3.6.2.",
"title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/34xxx/CVE-2026-34448.json"
},
{
"category": "description",
"text": "### Summary\nAn attacker who can place a malicious URL in an Attribute View `mAsse` field can trigger stored XSS when a victim opens the Gallery or Kanban view with “Cover From -> Asset Field” enabled. The vulnerable code accepts arbitrary `http(s)` URLs without extensions as images, stores the attacker-controlled string in `coverURL`, and injects it directly into an `` attribute without escaping. In the Electron desktop client, the injected JavaScript executes with `nodeIntegration` enabled and `contextIsolation` disabled, so the XSS reaches arbitrary OS command execution under the victim’s account.\n\n### Details\nThe vulnerable flow is:\n\n1. `IsPossiblyImage(assetPath)` accepts arbitrary `http(s)` URLs without validating that they are safe image URLs.\n2. When an Attribute View card uses `Cover From -> Asset Field`, the application copies `asset.Content` directly into `galleryCard.CoverURL / kanbanCard.CoverURL`.\n3. The front-end renderer inserts `coverURL` directly into `![](\"${getCompressURL(item.coverURL)}\")
` without escaping quotes or other attribute-breaking characters.\n4. A payload such as `https://example.com/\" onerror=\"require('child_process').exec('calc')` breaks out of the `src` attribute and adds an attacker-controlled `onerror` handler.\nWhen the image fails to load, the injected JavaScript runs in the Electron renderer. Because the desktop app enables `nodeIntegration: true` and disables `contextIsolation` and `webSecurity`, that JavaScript can access Node.js APIs and execute system commands.\n\n### PoC\n1. Install Electron Desktop app.\n2. Create a database / Attribute View with an mAsset column and add at least one row.\n3. Add any legitimate image to that mAsset field so the entry is stored as type image.\n4. Switch the view to Gallery or Kanban.\n5.Set Cover From to Asset Field and choose the mAsset column.\n6. Edit the existing image asset entry and replace its link with the following payload:\n```\nhttps://example.com/\" onerror=\"require('child_process').exec('calc')\n```\n7. Save the change and reopen or refresh the Gallery / Kanban view.\n8. Observe that the rendered HTML contains an injected onerror handler and the Calculator application starts on Windows.\n\nExample rendered output:\n```html\n![](\"https://example.com/\")
\n```\n### Impact\nAn attacker can store malicious content in a database asset field and execute arbitrary JavaScript when another user opens the affected Gallery or Kanban view. In the desktop client, that JavaScript has access to Node.js APIs, so the impact is not limited to browser-context XSS. The payload executes OS commands with the victim’s local user privileges, which turns this into remote code execution on the desktop application once the malicious content is delivered and rendered.",
"title": "github - https://api.github.com/advisories/GHSA-rx4h-526q-4458"
},
{
"category": "other",
"text": "0.00049",
"title": "EPSS"
},
{
"category": "other",
"text": "3.7",
"title": "NCSC Score"
},
{
"category": "other",
"text": "The value of the most recent CVSS (V3) score, Is related to an uncommon product vendor, Is related to (a version of) an uncommon product, The CVSS vector string contains A:N (Availability Impact: None), There is exploit data available from source Nvd",
"title": "NCSC Score top decreasing factors"
}
],
"product_status": {
"known_affected": [
"CSAFPID-5878158",
"CSAFPID-5899391"
]
},
"references": [
{
"category": "external",
"summary": "Source - nvd",
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-34448"
},
{
"category": "external",
"summary": "Source - cveprojectv5",
"url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/34xxx/CVE-2026-34448.json"
},
{
"category": "external",
"summary": "Source - github",
"url": "https://api.github.com/advisories/GHSA-rx4h-526q-4458"
},
{
"category": "external",
"summary": "Source - first",
"url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
},
{
"category": "external",
"summary": "Reference - cveprojectv5; nvd",
"url": "https://github.com/siyuan-note/siyuan/issues/17246"
},
{
"category": "external",
"summary": "Reference - cveprojectv5; nvd",
"url": "https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2"
},
{
"category": "external",
"summary": "Reference - cveprojectv5; github; nvd",
"url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-rx4h-526q-4458"
},
{
"category": "external",
"summary": "Reference - github",
"url": "https://github.com/advisories/GHSA-rx4h-526q-4458"
}
],
"scores": [
{
"cvss_v3": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H",
"baseScore": 9.0,
"baseSeverity": "CRITICAL"
},
"products": [
"CSAFPID-5878158",
"CSAFPID-5899391"
]
}
],
"title": "CVE-2026-34448"
}
]
}