CVE-2026-5730 Overview
CVE-2026-5730 is an authorization bypass vulnerability in Idvlabs Software and Consulting Services Inc. Ontime. The flaw is classified as Authorization Bypass Through User-Controlled Key [CWE-639], allowing exploitation of trusted identifiers. An unauthenticated remote attacker can manipulate object identifiers to access resources belonging to other users or tenants.
The vulnerability affects all Ontime versions through build 04052026. Because the attack requires no authentication, privileges, or user interaction, exposed instances are reachable directly over the network.
Critical Impact
Remote attackers can read sensitive records belonging to other users by tampering with trusted identifiers exposed in API requests or URLs.
Affected Products
- Idvlabs Ontime, all versions through 04052026
Discovery Timeline
- 2026-07-07 - CVE-2026-5730 published to the National Vulnerability Database
- 2026-07-07 - Last updated in NVD database
- 2026-07-09 - EPSS scoring published (0.246%, percentile 15.797)
Technical Details for CVE-2026-5730
Vulnerability Analysis
CVE-2026-5730 is an Insecure Direct Object Reference (IDOR) class weakness in Ontime. The application accepts identifiers from the client and uses them to retrieve resources without verifying that the requesting principal is authorized to access the referenced object. Attackers substitute or increment trusted identifiers such as record IDs, user IDs, or document keys to reach data that belongs to other accounts.
The attack is executed over the network against exposed Ontime endpoints. Successful exploitation compromises confidentiality of application data, while integrity and availability are not directly affected according to the published vector. The absence of authentication and user interaction requirements makes automated, large-scale enumeration practical against internet-facing deployments.
Root Cause
The root cause is missing server-side authorization enforcement on object references. Ontime relies on client-supplied identifiers as trusted inputs and does not consistently validate that the authenticated session or requesting context owns the target resource. This matches the [CWE-639] pattern in which access control decisions are delegated to key values that users can control.
Attack Vector
An attacker sends crafted HTTP requests to Ontime endpoints that consume object identifiers. By modifying the identifier parameter to reference resources owned by other users, the attacker retrieves data outside their authorization boundary. No credentials or prior interaction are required, and the request pattern is indistinguishable from a normal API call at the network layer.
See the Siber Güvenlik Advisory TR-26-0503 for the coordinated disclosure record. No verified public exploit code is available at the time of publication.
Detection Methods for CVE-2026-5730
Indicators of Compromise
- Sequential or non-sequential enumeration of numeric or GUID identifiers in Ontime request URIs or query parameters from a single source address.
- HTTP 200 responses to requests referencing object identifiers that do not match the requesting session's owned resources.
- Elevated request volume against Ontime API endpoints from unauthenticated or newly registered sources.
Detection Strategies
- Deploy application-layer logging that records the authenticated principal, the requested resource identifier, and the resolved owner for every object access.
- Compare requester identity against resource owner in log analytics and alert on mismatches.
- Monitor web application firewall logs for identifier tampering patterns such as rapid incremental changes to id, userId, or similar parameters.
Monitoring Recommendations
- Ingest Ontime web server and application logs into a centralized analytics platform for correlation and long-term retention.
- Baseline normal per-user access patterns and alert on deviations that indicate cross-tenant data access.
- Track authentication-free access to endpoints that return user-scoped data.
How to Mitigate CVE-2026-5730
Immediate Actions Required
- Restrict network exposure of Ontime instances to trusted networks or VPN clients until a fixed release is applied.
- Contact Idvlabs Software and Consulting Services Inc. for a patched build superseding version 04052026.
- Audit application logs for prior identifier tampering and unauthorized cross-account access.
Patch Information
At publication time, no fixed version identifier is listed in the NVD entry. Refer to the Siber Güvenlik Advisory TR-26-0503 and coordinate with the vendor for the remediated release. Apply the vendor-supplied update to all Ontime instances once available.
Workarounds
- Place Ontime behind an authenticating reverse proxy that enforces per-user session validation before requests reach the application.
- Configure a web application firewall rule set to block requests where the identifier parameter does not match the session owner mapping.
- Rotate any object identifiers that may have been enumerated, where the application supports identifier reissue.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
