CVE-2025-68948Public exploitNetwork attack vector

Account takeover via hard-coded session key

Published Dec 27, 2025 · Updated Dec 27, 2025

Hard-coded key use in SiYuan 3.5.1 and earlier allows attackers holding a user session cookie to recover the AccessAuthCode. The initSession function in kernel/server/serve.go initializes the cookie store with a static source-code string, making its encrypted session payload decryptable. Exploitation requires interception or theft of a valid cookie; the recovered authorization code permits direct authentication and persistent account takeover.

CVSS severity6.9
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded key use in SiYuan 3.5.1 and earlier allows attackers holding a user session cookie to recover the AccessAuthCode. The initSession function in kernel/server/serve.go initializes the cookie store with a static source-code string, making its encrypted session payload decryptable. Exploitation requires interception or theft of a valid cookie; the recovered authorization code permits direct authentication and persistent account takeover.

The record

CVE
CVE-2025-68948
Published
Dec 27, 2025
Updated
Dec 27, 2025
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-321, CWE-798, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 3.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=<= 3.5.1

Published CVSS scores

6.9GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-321Use of Hard-coded Cryptographic Key
CWE-798Use of Hard-coded Credentials
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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