CVE-2026-40043 Pachno 1.0.6 Authentication Bypass via runSwitchUser()
Authenticated low-privilege users can escalate privileges to administrator by manipulating the original_username cookie in Pachno.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40043?
CVE-2026-40043 is a high-severity authentication bypass vulnerability in pancho Pachno, published on 13 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-639
Which versions are affected by CVE-2026-40043?
How do I fix CVE-2026-40043?
No fix has been published for CVE-2026-40043 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-40043 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40043 exists.
Sources
Also known as GHSA-h2hg-847v-g327.