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Description

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.

PUBLISHED Reserved 2026-04-08 | Published 2026-04-13 | Updated 2026-04-13 | Assigner VulnCheck




HIGH: 7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Problem types

Authorization Bypass Through User-Controlled Key

Product status

1.0.6
affected

Credits

LiquidWorm as Gjoko Krstic of Zero Science Lab finder

References

www.zeroscience.mk/ exploit

www.zeroscience.mk/en/vulnerabilities/ZSL-2026-5985.php (Zero Science Lab Disclosure) third-party-advisory

www.vulncheck.com/...authentication-bypass-via-runswitchuser (VulnCheck Advisory: Pachno 1.0.6 Authentication Bypass via runSwitchUser()) third-party-advisory

cve.org (CVE-2026-40043)

nvd.nist.gov (CVE-2026-40043)

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