CVE-2025-68621
Trilium Notes has a Timing Attack Vulnerability in /api/login/sync
- Published
- Feb 6, 2026
- Updated
- Feb 9, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:NLow · next 30 days
- Percentile
- 43.5%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1Educational PoC and analysis of CVE-2025-68621, a timing attack on Trilium Notes sync login. Demonstrates HMAC hash recovery via network timing side-channel, with root cause, fix, and mitigation details.
Responsible use
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