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.

CVSS 4.0

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

CVSS 3.1

6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 22% of CVEs (scores of 2026-10-26)

CWE

CWE-639

Published

2026-04-13

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

References

• https://www.vulncheck.com/advisories/pachno-authentication-bypass-via-runswitchuser
• https://www.zeroscience.mk/en/vulnerabilities/ZSL-2026-5985.php
• https://www.zeroscience.mk/#/advisories/ZSL-2026-5985

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