How severe is CVE-2025-68621?

CVE-2025-68621 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2025-68621 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-68621?

CVE-2025-68621 affects Triliumnotes Trilium. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-68621?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-68621 have an EU (EUVD) identifier?

Yes. CVE-2025-68621 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206876.

When was CVE-2025-68621 published?

CVE-2025-68621 was published on 2026-02-06 and last updated on 2026-06-17.

CVE-2025-68621

CVE-2025-68621 is a high-severity vulnerability in Triliumnotes Trilium with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-208.

Key facts

Severity: High (CVSS 3.x base score 7.4)
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-206876
Weakness: CWE-208
Affected product: Triliumnotes Trilium
Published: 2026-02-06
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-68621?: 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.
How severe is CVE-2025-68621?: CVE-2025-68621 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2025-68621 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-68621?: CVE-2025-68621 affects Triliumnotes Trilium. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-68621?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-68621 have an EU (EUVD) identifier?: Yes. CVE-2025-68621 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206876.
When was CVE-2025-68621 published?: CVE-2025-68621 was published on 2026-02-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:triliumnotes:trilium:*:*:*:*:*:*:*:*

More vulnerabilities in Triliumnotes Trilium

CVE-2022-2290 — Medium (CVSS 6.1): Cross-site Scripting (XSS) - Reflected in GitHub repository zadam/trilium prior to 0.52.4, 0.53.1-beta.

All CVEs affecting Triliumnotes Trilium →

Other CWE-208 vulnerabilities

CVE-2023-41313 — Critical (CVSS 9.8): The authentication method in Apache Doris versions before 2.0.0 was vulnerable to timing attacks. Users are recommended…
CVE-2024-42512 — High (CVSS 8.6): Vulnerability in the OPC UA .NET Standard Stack before 1.5.374.158 allows an unauthorized attacker to bypass…
CVE-2025-53940 — High (CVSS 8.5): Quiet is an alternative to team chat apps like Slack, Discord, and Element that does not require trusting a central…
CVE-2026-47784 — High (CVSS 8.1): In memcached before 1.6.42, password data for SASL password database authentication has a timing side channel because…
CVE-2026-47783 — High (CVSS 8.1): In memcached before 1.6.42, username data for SASL password database authentication has a timing side channel because a…
CVE-2026-42602 — High (CVSS 8.1): azureauthextension is the Azure Authenticator Extension. From 0.124.0 to 0.150.0, a server-side authentication bypass…

Browse all CWE-208 vulnerabilities →