CVE-2026-40043
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
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.
Risk Assessment
A low-privileged user can take over an administrator account by obtaining session tokens or password hashes. This leads to full compromise of the Pachno application.
Recommendation
Update Pachno to a patched version or apply a temporary mitigation restricting the runSwitchUser() action. Force password changes for administrative accounts and audit logs for suspicious user switches.
Other vulnerabilities in Pachno
See all- CVE-2026-40041Medium
Pachno 1.0.6 contains a CSRF vulnerability that allows attackers to perform arbitrary actions in an authenticated user's context by exploiting missing CSRF protections on state-changing endpoints. Attackers can craft malicious requests targeting login, registration, file upload, milestone editing, and administrative functions.
- CVE-2026-40039Medium
Pachno 1.0.6 contains an open redirection vulnerability that allows attackers to redirect users to arbitrary external websites by manipulating the return_to parameter. Attackers can craft malicious login URLs with unvalidated return_to values to conduct phishing attacks and steal user credentials.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS