CVE-2025-68621

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.

Affected

TriliumNext · Trilium

CVSS v3.1 GITHUB

7.4 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS

0.57% chance of exploitation in the next 30 days, 46th percentile

Published

2026-02-06

Updated

2026-02-09

Proof-of-concept exploits (1)

• sivaadityacoder/CVE-2025-686210★ · 2026-04-25

Security advisories

• TriliumNext/Trilium/security/advisories/GHSA-hxf6-58cx-qq3x
• TriliumNext/Trilium/pull/8129

References

• CVE Record
• NVD entry

Related

• CVE-2025-67146
• CVE-2025-67147
• CVE-2026-22038