Auth bypass in Tribulant Software Newsletters

CVE-2026-54840

Unauthenticated Broken Access Control in Newsletters <= 4.13 versions.

Vulnerability class: Broken Access Control

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.003 (20.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-54840: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-54840?
CVE-2026-54840 is a high-severity vulnerability in Tribulant Software Newsletters, classified under Missing Authorization. CVSS score: 7.3/10. Published 2026-06-26.
How severe is CVE-2026-54840?
High severity. CVSS v3 base score is 7.3 out of 10.