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PatchSiren cyber security CVE debrief

CVE-2026-73045 siyuan-note CVE debrief

CVE-2026-73045 is a HIGH-rated vulnerability in SiYuan before 3.7.4 that allows unauthenticated attackers to brute-force per-notebook publish passwords via the authFilePublishAccess endpoint without rate limiting or CAPTCHA. The vulnerability has a CVSS score of 8.7 and is rated HIGH. Affected product deployments should be reviewed for exposure, and compensating controls should be assessed. Security teams should prioritize patching this vulnerability, especially for publicly exposed or internet-facing installations. The CVE record was published on 2026-08-15T22:16:54.463Z and has not been modified since then. Details are limited to CVE and NVD information, so defenders should verify affected product deployments and review compensating controls. The vulnerability allows unauthenticated attackers to submit unbounded password guesses without rate limiting or CAPTCHA to gain access to password-protected published notebooks.

Vendor
siyuan-note
Product
siyuan
CVSS
HIGH 8.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-15
Original CVE updated
2026-08-26
Advisory published
2026-08-15
Advisory updated
2026-08-26

Who should care

Users of SiYuan before version 3.7.4, especially those with publicly exposed or internet-facing installations, should prioritize patching this HIGH-rated vulnerability. Security teams and vulnerability management teams should review the affected scope and assess exposure. Operators and platform administrators should review compensating controls and monitor for suspicious activity.

Technical summary

CVE-2026-73045 is a HIGH-rated vulnerability in SiYuan before 3.7.4 that allows unauthenticated attackers to brute-force per-notebook publish passwords via the authFilePublishAccess endpoint without rate limiting or CAPTCHA. The vulnerability has a CVSS score of 8.7 and is rated HIGH. It is recommended to prioritize patching this vulnerability, especially for publicly exposed or internet-facing installations.

Defensive priority

CVE-2026-73045 is rated HIGH with a CVSS score of 8.7; immediate defensive review is recommended.

Recommended defensive actions

  • Review and apply vendor-provided patches or updates for SiYuan to version 3.7.4 or later.
  • Implement rate limiting and CAPTCHA mechanisms for authentication attempts.
  • Monitor for suspicious authentication activity.
  • Inventory and assess exposure of SiYuan installations.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE-2026-73045 record indicates an improper restriction of excessive authentication attempts vulnerability in SiYuan before 3.7.4. Details are limited, but defenders should verify the affected product deployments, assess exposure, and review compensating controls. The vulnerability allows unauthenticated attackers to brute-force per-notebook publish passwords via the authFilePublishAccess endpoint without rate limiting or CAPTCHA. Evidence is limited to CVE and NVD details.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-73045 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-73045

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-73045 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-73045

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.