CVE-2025-68621
Unknown Unknown - Not Provided
Timing Attack in Trilium Notes Sync Enables Full Auth Bypass

Publication date: 2026-02-06

Last updated on: 2026-02-24

Assigner: GitHub, Inc.

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.
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Meta Information
Published
2026-02-06
Last Modified
2026-02-24
Generated
2026-06-16
AI Q&A
2026-02-07
EPSS Evaluated
2026-06-15
NVD
CVE-2025-68621
EUVD
EUVD-2025-206876
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
triliumnotes trilium to 0.101.0 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-208 Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.
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Executive Summary

This vulnerability exists in Trilium Notes versions prior to 0.101.0. It is a critical timing attack in the sync authentication endpoint that allows unauthenticated remote attackers to recover HMAC authentication hashes byte-by-byte by analyzing the timing of responses. This statistical timing analysis enables attackers to bypass authentication completely without knowing the password.

Impact Analysis

Exploitation of this vulnerability allows attackers to gain full read and write access to the victim's knowledge base in Trilium Notes. Since the attacker can bypass authentication without a password, they can view, modify, or delete sensitive personal or organizational information stored within the application.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, you should upgrade Trilium Notes to version 0.101.0 or later, where the critical timing attack vulnerability in the sync authentication endpoint has been fixed.

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