Auth bypass in Tillkit
CVE-2026-91078
The TillKit WordPress plugin before 1.0.5 does not require the hard-coded, publicly known PIN of the privileged POS account it creates on activation to be changed before use, and it authenticates its public POS login endpoint on that PIN alone with no identity or capability check, allowing unauthenticated attackers to obtain a privileged POS session and thereby read customer and site-user personal data and modify store data.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Tillkit
Weakness classification (CWE)
References
- wpscan.com/vulnerability/7ab037d6-c670-4eaf-be0d-11cc9e20b18e/ (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-91078?
- CVE-2026-91078 is a high-severity vulnerability in Tillkit, classified under Improper Authentication. CVSS score: 8.2/10. Published 2026-10-03.
- How severe is CVE-2026-91078?
- High severity. CVSS v3 base score is 8.2 out of 10.