What is CVE-2026-40043?

CVE-2026-40043 is a medium-severity vulnerability in Pancho Pachno, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-04-13.

How severe is CVE-2026-40043?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Pancho Pachno

CVE-2026-40043

Pachno 1.0.6 contains an authentication bypass vulnerability in the runSwitchUser() action that allows authenticated low-privilege users to escalate privileges by manipulating the original_username cookie. Attackers can set the client-cont…

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.001 (24.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Pancho Pachno — versions 1.0.6

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

Zero Science Lab Disclosure (third-party-advisory)
VulnCheck Advisory: Pachno 1.0.6 Authentication Bypass via runSwitchUser() (third-party-advisory)

Frequently asked questions

What is CVE-2026-40043?: CVE-2026-40043 is a medium-severity vulnerability in Pancho Pachno, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-04-13.
How severe is CVE-2026-40043?: Medium severity. CVSS v3 base score is 6.5 out of 10.