EUVD-2026-51068
GHSA-h2gf-gwxr-4pm4
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable and unauthenticated (AV:N/PR:N/UI:N), but AC:H because the attacker must first obtain a valid reset token; account takeover yields C:H/I:H with no availability impact (A:N).
Primary rating from Vendor (INCIBE).
CVSS VectorVendor: INCIBE
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Account takeover in osTicket (the open-source support ticketing system) before v1.17.8 and v1.18.4 stems from an inverted logic check (CWE-640) in the password-reset token validation routine, where the expiry check runs only when the token's timestamp lookup fails - so any token with a valid timestamp bypasses expiration entirely. An attacker who obtains a valid reset token can replay it after it should have expired to hijack the associated account. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to possess a valid, previously issued password-reset token for the target account - this is the concrete precondition encoded as AT:P in the CVSS 4.0 vector; the flaw specifically lets such a token bypass the configured validity-period (expiry) check because the expiry comparison only executes when the timestamp lookup fails. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-supplied CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H) scores 9.1 Critical, reflecting network-reachable, unauthenticated exploitation with high confidentiality and integrity impact but no availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker obtains a password-reset token for a target osTicket account - for example an old token that was emailed and never used, one exposed in logs or a shared support inbox, or one captured in transit - and submits it to the reset endpoint after its intended validity window has passed. Because the expired-token check is skipped whenever the token's timestamp exists, the stale token is accepted, letting the attacker set a new password and take over the account remotely without authentication. … |
| Remediation | Vendor-released patch: upgrade to osTicket v1.18.4 (for 1.18.x deployments) or v1.17.8 (for 1.17.x deployments), which correct the token expiry validation logic; consult the INCIBE-CERT advisory at https://www.incibe.es/en/incibe-cert/notices/aviso/weak-password-recovery-mechanism-osticket-enhancesoft-llc for details. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit osTicket authentication logs for suspicious password-reset activity and account access anomalies; disable and rotate active support user sessions as precaution. …
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Same technique Authentication Bypass
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