CVE-2026-66376: Authentication Bypass Vulnerability

CVE-2026-66376 Overview

CVE-2026-66376 describes an insufficient session expiration issue where credentials belonging to a deleted user account may remain valid for a short window under specific conditions. The flaw is tracked under CWE-613 (Insufficient Session Expiration). An attacker who already holds low-privilege credentials could continue authenticating and performing actions after the account is supposed to be revoked. The issue is referenced in JFrog documentation, indicating relevance to JFrog Artifactory deployments.

Critical Impact
Deleted user credentials may retain limited authentication and authorization capability for a short period, undermining offboarding and access revocation controls.

Affected Products

JFrog Artifactory (self-managed) — see JFrog Artifactory Release Notes
Refer to JFrog Security Advisories for specific fixed versions
Specific affected version ranges are not enumerated in the NVD entry

Discovery Timeline

2026-08-12 - CVE-2026-66376 published to NVD
2026-08-12 - Last updated in NVD database

Technical Details for CVE-2026-66376

Vulnerability Analysis

The vulnerability is a session and credential lifecycle flaw. When an administrator deletes a user account, the credentials associated with that account should be immediately invalidated across all authentication paths. In this case, the invalidation is not fully atomic, leaving a short window during which the deleted user's credentials still authenticate successfully.

An attacker leveraging this window can continue to interact with the service using the deleted account. Because the attack requires existing low-privilege credentials and specific timing conditions, exploitation is constrained. The confidentiality and integrity impact is limited, and there is no availability impact.

This class of weakness maps to CWE-613: Insufficient Session Expiration. Related weaknesses include stale token caching, delayed propagation of revocation events across cluster nodes, and reliance on time-based token expiration rather than explicit invalidation.

Root Cause

The root cause is that user deletion does not synchronously invalidate all active credentials or cached authentication state. Systems that cache authentication decisions or replicate identity state asynchronously across nodes can continue to accept the revoked credentials until caches expire or replication completes.

Attack Vector

Exploitation requires network access to the affected service and prior possession of the deleted user's credentials, such as a password or API key. After account deletion, the attacker replays those credentials against the service within the residual validity window and performs actions permitted by the account's prior role.

No authenticated exploit code is publicly available for this issue. Refer to the JFrog Security Advisories for vendor technical detail.

Detection Methods for CVE-2026-66376

Indicators of Compromise

Successful authentication events referencing a user principal that was deleted from the identity store within the preceding minutes.
API token usage or repository operations attributed to an account that no longer exists in the user directory.
Audit log entries showing session activity or resource access after a corresponding user deletion event.

Detection Strategies

Correlate user-deletion audit events with subsequent authentication events for the same principal and alert on any post-deletion success.
Baseline the expected propagation time for account revocation and alert on authentications exceeding that threshold after deletion.
Review access token and API key usage patterns for continued activity after the associated user is removed.

Monitoring Recommendations

Ingest Artifactory access and audit logs into a central log platform and retain them long enough to cover offboarding windows.
Track offboarding workflows end-to-end, including confirmation that all tokens, sessions, and API keys tied to the user are revoked.
Monitor identity provider synchronization latency to detect delays that widen the residual credential validity window.

How to Mitigate CVE-2026-66376

Immediate Actions Required

Apply the latest security updates published in the JFrog Artifactory Release Notes.
When deleting a user, also explicitly revoke API keys, access tokens, and active sessions associated with that account.
Audit recent user-deletion events and verify that no post-deletion authentications occurred for those principals.

Patch Information

The vendor addresses this issue in updated releases of JFrog Artifactory. Consult the JFrog Security Advisories and matching release notes to identify the fixed version applicable to your deployment channel and upgrade accordingly.

Workarounds

Rotate or revoke all tokens and API keys tied to a user before deleting the account, rather than relying solely on the delete operation.
Force cache and session invalidation across all cluster nodes after user removal, where such an administrative action is exposed.
Restrict network access to the Artifactory administrative and authentication endpoints so that credential replay from unexpected sources is blocked.

bash

# Configuration example
# Recommended offboarding sequence for an Artifactory user
# 1. Revoke tokens and API keys tied to the user
# 2. Terminate active sessions
# 3. Delete the user account
# 4. Verify no authentications succeed for the principal after deletion