Vulnerability · Published Apr 13, 2026 · Assigned by VulnCheck

CVE-2026-40043Pachno 1.0.6 Authentication Bypass via runSwitchUser()

Medium 6.5

In plain English

A medium-severity authorization bypass via user-controlled key in Pachno from pancho. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 67.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
pancho	Pachno	1.0.6

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

Zero Science Lab Disclosure third-party-advisory
VulnCheck Advisory: Pachno 1.0.6 Authentication Bypass via runSwitchUser() third-party-advisory
https://www.zeroscience.mk/#/advisories/ZSL-2026-5985 exploit