Vulnerability · Published Jul 30, 2026 · Assigned by INCIBE
CVE-2026-18363Weak password recovery mechanism in osTicket by Enhancesoft LLC
Critical 9.1
In plain English
A critical-severity security flaw in osTicket from Enhancesoft LLC. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities).
Official description
A logic vulnerability in the password reset token validation routine implemented by osTicket in versions prior to v1.17.8 and v1.18.4. During the password reset process, the application retrieves the timestamp associated with the provided token and checks whether the configured validity period has expired. Consequently, the expiry check is only performed if the timestamp lookup fails, allowing tokens with an existing timestamp to bypass the intended expiry validation. Therefore, an attacker able to obtain a valid password reset token could reuse it to perform an unauthorised password reset and compromise the affected account.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Enhancesoft LLC | osTicket | 0 – before 1.17.80 – before 1.18.4 |
Weakness: CWE-640 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N