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-controlled original_username cookie to any value and request a switch to user ID 1 to obtain session tokens or password hashes belonging to administrator accounts.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (43.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Pancho Pachno — versions 1.0.6
Weakness classification (CWE)
References
- www.zeroscience.mk/en/vulnerabilities/ZSL-2026-5985.php (third-party-advisory)
- www.vulncheck.com/advisories/pachno-authentication-bypass-via-runswitchuser (third-party-advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0
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.