What is CVE-2026-39309?

CVE-2026-39309 is a medium-severity vulnerability in Triliumnext Trilium, classified under Authentication Bypass by Spoofing. CVSS score: 5.5/10. Published 2026-05-20.

How severe is CVE-2026-39309?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Triliumnext Trilium

CVE-2026-39309

Trilium Notes is a cross-platform, hierarchical note taking application focused on building large personal knowledge bases. In versions 0.102.1 and prior, the Electron configuration is vulnerable to TCC Bypass via Prompt Spoofing, allowing…

EPSS: 0.000 (0.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Triliumnext Trilium — versions < 0.102.2

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing
CWE-451 — User Interface (UI) Misrepresentation of Critical Information

References

security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-39309?: CVE-2026-39309 is a medium-severity vulnerability in Triliumnext Trilium, classified under Authentication Bypass by Spoofing. CVSS score: 5.5/10. Published 2026-05-20.
How severe is CVE-2026-39309?: Medium severity. CVSS v3 base score is 5.5 out of 10.