Authenticated privilege escalation via client-controlled switch-user cookie
Published Apr 13, 2026 · Updated Apr 13, 2026
Authentication bypass in Pachno 1.0.6 allows remote authenticated users to obtain administrator session tokens or password hashes. The runSwitchUser() action trusts the client-controlled original_username cookie and accepts a switch to user ID 1 without verifying authorization. Any low-privilege account can therefore access administrator authentication material, with no reported ability to alter data or interrupt service.
Summary
What happened
Authentication bypass in Pachno 1.0.6 allows remote authenticated users to obtain administrator session tokens or password hashes. The runSwitchUser() action trusts the client-controlled original_username cookie and accepts a switch to user ID 1 without verifying authorization. Any low-privilege account can therefore access administrator authentication material, with no reported ability to alter data or interrupt service.
The record
- CVE
- CVE-2026-40043
- Published
- Apr 13, 2026
- Updated
- Apr 13, 2026
- Vendor
- Pachno
- Product
- Pachno
- Classifications
- CWE-639, T1068
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 13, 2026CVE publishedPublication date reported by the CVE source.
- Apr 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.0.6
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Zero Science Lab proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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