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

Description

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.

Scores

EPSS (exploitation in 30 days)

0.56% · top 53% of all CVEs (7 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.

Weakness

• CWE-208: Observable Timing Discrepancy (opens in a new tab)All about CWE-208 and its CVEs

Affected products

• TriliumNext · Trilium

  • affected < 0.101.0

References (2)

• https://github.com/TriliumNext/Trilium/security/advisories/GHSA-hxf6-58cx-qq3x (opens in a new tab)x_refsource_CONFIRM
• https://github.com/TriliumNext/Trilium/pull/8129 (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2025-68621](https://trackcve.app/badge/CVE-2025-68621.svg)](https://trackcve.app/cve/CVE-2025-68621)

Record last updated 9 Feb 2026, 15:26 UTC.