SiYuan: Information Disclosure and Authentication Bypass via Hardcoded Session Secret

SiYuan is self-hosted, open source personal knowledge management software. In versions 3.5.1 and prior, the SiYuan Note application utilizes a hardcoded cryptographic secret for its session store. This unsafe practice renders the session encryption ineffective. Since the sensitive AccessAuthCode is stored within the session cookie, an attacker who intercepts or obtains a user's encrypted session cookie (e.g., via session hijacking) can locally decrypt it using the public key. Once decrypted, the attacker can retrieve the AccessAuthCode in plain text and use it to authenticate or take over the session.

Problem type

CWE-321: Use of Hard-coded Cryptographic Key

Affected products

siyuan-note

siyuan

<= 3.5.1 - AFFECTED

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f7ph-rc3w-qp28

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f7ph-rc3w-qp28

x_refsource_CONFIRM

JSON source

https://cveawg.mitre.org/api/cve/CVE-2025-68948

Click to expand

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    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "dateUpdated": "2025-12-27T00:21:31.864Z",
    "dateReserved": "2025-12-26T16:36:24.151Z",
    "datePublished": "2025-12-27T00:21:31.864Z",
    "state": "PUBLISHED"
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        "shortName": "GitHub_M",
        "dateUpdated": "2025-12-27T00:21:31.864Z"
      },
      "title": "SiYuan: Information Disclosure and Authentication Bypass via Hardcoded Session Secret",
      "descriptions": [
        {
          "lang": "en",
          "value": "SiYuan is self-hosted, open source personal knowledge management software. In versions 3.5.1 and prior, the SiYuan Note application utilizes a hardcoded cryptographic secret for its session store. This unsafe practice renders the session encryption ineffective. Since the sensitive AccessAuthCode is stored within the session cookie, an attacker who intercepts or obtains a user's encrypted session cookie (e.g., via session hijacking) can locally decrypt it using the public key. Once decrypted, the attacker can retrieve the AccessAuthCode in plain text and use it to authenticate or take over the session."
        }
      ],
      "affected": [
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          "product": "siyuan",
          "versions": [
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              "version": "<= 3.5.1",
              "status": "affected"
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      "problemTypes": [
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          "descriptions": [
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              "description": "CWE-321: Use of Hard-coded Cryptographic Key",
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          "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f7ph-rc3w-qp28",
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