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    "cveMetadata": {
        "cveId": "CVE-2026-100635",
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "state": "PUBLISHED",
        "assignerShortName": "VulnCheck",
        "dateReserved": "2026-09-26T02:31:42.100Z",
        "datePublished": "2026-09-26T13:23:09.854Z",
        "dateUpdated": "2026-10-08T15:21:51.712Z"
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            "datePublic": "2026-09-11T00:00:00.000Z",
            "title": "SiYuan before v3.8.4 Authentication Bypass via Plaintext Session Cookie",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "SiYuan before v3.8.4 contains an authentication bypass vulnerability in the publish service where session cookies are issued without Secure or SameSite attributes over plaintext HTTP connections. An on-path attacker can observe a valid publish-visitor-session-id cookie from a Basic Auth exchange and replay it to access authenticated publish endpoints without knowing the account password."
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            "problemTypes": [
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                    "descriptions": [
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                            "lang": "en",
                            "description": "Cleartext Transmission of Sensitive Information",
                            "cweId": "CWE-319",
                            "type": "CWE"
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                    ]
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            "affected": [
                {
                    "vendor": "siyuan-note",
                    "product": "siyuan",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:golang/github.com/siyuan-note/siyuan/kernel",
                    "versions": [
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                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "3.8.4"
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                            "version": "3.8.4",
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                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "HIGH",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 8.2,
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                        "scope": "UNCHANGED",
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                        "integrityImpact": "NONE",
                        "availabilityImpact": "NONE",
                        "baseScore": 5.9,
                        "baseSeverity": "MEDIUM"
                    }
                }
            ],
            "references": [
                {
                    "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j37-4gq6-wm7m",
                    "tags": [
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                    "tags": [
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                    "url": "https://www.vulncheck.com/advisories/siyuan-before-3.8.4-authentication-bypass-via-plaintext-session-cookie"
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                    "value": "rexpository",
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        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j37-4gq6-wm7m",
                        "tags": [
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                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-09-28T18:53:29.876873Z",
                                "id": "CVE-2026-100635",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "no"
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                                        "Technical Impact": "partial"
                                    }
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                                "version": "2.0.3"
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                "title": "CISA ADP Vulnrichment",
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