Vulnerability-Lookup

CVE-2026-92986 (GCVE-0-2026-92986)

Vulnerability from cvelistv5 – Published: 2026-09-17 14:22 – Updated: 2026-09-17 19:20

Title

SiYuan before 3.8.4 Cross-Site Scripting via Document Title

Summary

SiYuan before 3.8.4 renders document titles as HTML in the backlink dock tree without escaping markup characters. Attackers can set malicious titles through the rename API or crafted notebooks to execute scripts in the Electron renderer with access to child_process for command execution.

Severity

8.6 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.8 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-17 19:18 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://github.com/siyuan-note/siyuan/commit/6f09…	patch
https://github.com/siyuan-note/siyuan	product
https://github.com/siyuan-note/siyuan/security/ad…	vendor-advisory
https://github.com/siyuan-note/siyuan/blob/v3.8.3…	technical-description
https://www.vulncheck.com/advisories/siyuan-befor…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
siyuan-note	siyuan	Affected: 0 , < 3.8.4 (semver) cpe:2.3:a:b3log:siyuan::::::::

Date Public

2026-09-14 00:00

Credits

EVIL0RD

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-92986

Vulnerability from fkie_nvd - Published: 2026-09-17 15:17 - Updated: 2026-09-17 20:18

Severity

8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/siyuan-note/siyuan
	disclosure@vulncheck.com	https://github.com/siyuan-note/siyuan/blob/v3.8.3/app/src/util/Tree.ts#L134
	disclosure@vulncheck.com	https://github.com/siyuan-note/siyuan/commit/6f093ebe50afc503e2a8b056164293054f8509e7
	disclosure@vulncheck.com	https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c5h9-g2c6-fxjw
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/siyuan-before-3.8.4-cross-site-scripting-via-document-title

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-HQJ9-5Q65-F4G9

Vulnerability from github – Published: 2026-09-17 15:32 – Updated: 2026-09-17 15:32

Details

Severity

8.8 (High)


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

8.6 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-92986"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T15:17:02Z",
    "severity": "HIGH"
  },
  "details": "SiYuan before 3.8.4 renders document titles as HTML in the backlink dock tree without escaping markup characters. Attackers can set malicious titles through the rename API or crafted notebooks to execute scripts in the Electron renderer with access to child_process for command execution.",
  "id": "GHSA-hqj9-5q65-f4g9",
  "modified": "2026-09-17T15:32:19Z",
  "published": "2026-09-17T15:32:19Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c5h9-g2c6-fxjw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-92986"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/commit/6f093ebe50afc503e2a8b056164293054f8509e7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/blob/v3.8.3/app/src/util/Tree.ts#L134"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/siyuan-before-3.8.4-cross-site-scripting-via-document-title"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/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",
      "type": "CVSS_V4"
    }
  ]
}

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.

Related by attack behaviour

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-2026-92986 (GCVE-0-2026-92986)

FKIE_CVE-2026-92986

GHSA-HQJ9-5Q65-F4G9

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Nomenclature

Related by attack behaviour