A logic vulnerability in the password reset token validation routine implemented by osTicket in versions prior to v1.17.8 and v1.18.4. (CVE-2026-18363)
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.
AI Analysis
Technical Summary
The vulnerability in osTicket's password reset process arises because the application only performs the expiry check if the timestamp lookup for the token fails. If the timestamp exists, the expiry validation is skipped, allowing tokens to be reused after their intended expiration. This logic flaw affects versions prior to v1.17.8 and v1.18.4. An attacker with access to a valid reset token can exploit this to reset passwords without authorization, leading to account compromise.
Potential Impact
An attacker able to obtain a valid password reset token can reuse it indefinitely due to the bypassed expiry check, enabling unauthorized password resets and potential account takeover. This compromises the confidentiality and integrity of affected user accounts.
Mitigation Recommendations
A fix is available in osTicket versions v1.17.8 and v1.18.4 that corrects the token expiry validation logic. Users should upgrade to these or later versions to remediate the vulnerability. Patch status is not explicitly confirmed beyond these versions; verify with the vendor advisory for the latest remediation guidance.
A logic vulnerability in the password reset token validation routine implemented by osTicket in versions prior to v1.17.8 and v1.18.4. (CVE-2026-18363)
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.
CVSS v4.0
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in osTicket's password reset process arises because the application only performs the expiry check if the timestamp lookup for the token fails. If the timestamp exists, the expiry validation is skipped, allowing tokens to be reused after their intended expiration. This logic flaw affects versions prior to v1.17.8 and v1.18.4. An attacker with access to a valid reset token can exploit this to reset passwords without authorization, leading to account compromise.
Potential Impact
An attacker able to obtain a valid password reset token can reuse it indefinitely due to the bypassed expiry check, enabling unauthorized password resets and potential account takeover. This compromises the confidentiality and integrity of affected user accounts.
Mitigation Recommendations
A fix is available in osTicket versions v1.17.8 and v1.18.4 that corrects the token expiry validation logic. Users should upgrade to these or later versions to remediate the vulnerability. Patch status is not explicitly confirmed beyond these versions; verify with the vendor advisory for the latest remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-h2gf-gwxr-4pm4
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-18363"]
- Database Specific Severity
- CRITICAL
- Cvss Version
- 4.0
Threat ID: 6a6b72b29c2644c7f84725a8
Added to database: 07/30/2026, 15:50:10 UTC
Last enriched: 07/30/2026, 20:10:58 UTC
Last updated: 09/13/2026, 05:29:53 UTC
Views: 142
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