Trilium Notes has a Timing Attack Vulnerability in /api/login/sync

Trilium Notes is an open-source, cross-platform hierarchical note taking application with focus on building large personal knowledge bases. Prior to 0.101.0, a critical timing attack vulnerability in Trilium's sync authentication endpoint allows unauthenticated remote attackers to recover HMAC authentication hashes byte-by-byte through statistical timing analysis. This enables complete authentication bypass without password knowledge, granting full read/write access to victim's knowledge base. This vulnerability is fixed in 0.101.0.

Problem type

CWE-208: Observable Timing Discrepancy

Affected products

TriliumNext

Trilium

< 0.101.0 - AFFECTED

References

https://github.com/TriliumNext/Trilium/security/advisories/GHSA-hxf6-58cx-qq3x

https://github.com/TriliumNext/Trilium/security/advisories/GHSA-hxf6-58cx-qq3x

x_refsource_CONFIRM

https://github.com/TriliumNext/Trilium/pull/8129

https://github.com/TriliumNext/Trilium/pull/8129

x_refsource_MISC

JSON source

https://cveawg.mitre.org/api/cve/CVE-2025-68621

Click to expand

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    "dateUpdated": "2026-02-06T21:21:19.308Z",
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      "descriptions": [
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          "lang": "en",
          "value": "Trilium Notes is an open-source, cross-platform hierarchical note taking application with focus on building large personal knowledge bases.  Prior to 0.101.0, a critical timing attack vulnerability in Trilium's sync authentication endpoint allows unauthenticated remote attackers to recover HMAC authentication hashes byte-by-byte through statistical timing analysis. This enables complete authentication bypass without password knowledge, granting full read/write access to victim's knowledge base. This vulnerability is fixed in 0.101.0."
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