CVE-2026-11763: GisLab Auth Bypass Vulnerability

CVE-2026-11763 Overview

CVE-2026-11763 is an authorization bypass vulnerability in the GisLab Laboratory Management System developed by Gis Informatics Engineering Consulting Laboratory R&D and Software Services Inc. The flaw allows authenticated attackers to exploit trusted identifiers to access data belonging to other users. It is categorized under [CWE-639] Authorization Bypass Through User-Controlled Key, a class of Insecure Direct Object Reference (IDOR) issues. The vulnerability affects GisLab Laboratory Management System versions 1.4.03 through 08072026. Exploitation requires low privileges and no user interaction, and can be executed remotely over the network.

Critical Impact

Authenticated attackers can manipulate user-controlled identifiers in requests to read confidential laboratory data belonging to other users or tenants.

Affected Products

• GisLab Laboratory Management System version 1.4.03
• GisLab Laboratory Management System versions between 1.4.03 and 08072026
• GisLab Laboratory Management System version 08072026

Discovery Timeline

• 2026-07-17 - CVE-2026-11763 published to NVD
• 2026-07-17 - Last updated in NVD database

Technical Details for CVE-2026-11763

Vulnerability Analysis

The GisLab Laboratory Management System exposes object identifiers in application requests without enforcing per-user authorization checks. When a client submits a request referencing a resource identifier such as a record ID, sample ID, or report ID, the server retrieves and returns the object without confirming the requester owns or is permitted to view it. This pattern matches classic Insecure Direct Object Reference behavior described by [CWE-639]. An attacker with a valid low-privileged account can iterate or guess identifiers to enumerate data belonging to other laboratory users. The CVSS vector indicates confidentiality impact only, meaning the flaw enables data disclosure but does not directly allow modification or service disruption.

Root Cause

The root cause is missing server-side authorization enforcement on object references. The application trusts identifiers supplied by the client as authoritative access tokens for the referenced resources. It does not cross-check the authenticated session against the ownership or access control list of the requested object before returning data.

Attack Vector

Exploitation occurs over the network against the application's HTTP interface. An attacker authenticates with valid credentials for any account within the platform. The attacker then modifies identifier parameters — such as numeric IDs in URL paths, query strings, or JSON request bodies — to reference objects belonging to other users. The server responds with the target user's records because it validates only the session, not the object relationship.

No verified exploit code is publicly available. See the Siber Güvenlik Notification TR-26-0573 for the official advisory.

Detection Methods for CVE-2026-11763

Indicators of Compromise

• Application access logs showing a single authenticated session requesting a wide range of sequential or non-sequential resource identifiers.
• HTTP 200 responses to resource requests where the returned object owner does not match the session user.
• Sudden spikes in read operations on laboratory records, samples, or reports from a single account.

Detection Strategies

• Correlate authenticated user IDs with the ownership metadata of objects returned in HTTP responses to flag mismatches.
• Baseline normal per-user access volumes and alert on accounts that exceed typical record retrieval rates.
• Deploy web application firewall rules that inspect ID parameters in requests and detect enumeration patterns.

Monitoring Recommendations

• Centralize GisLab application, database, and reverse proxy logs in a SIEM for correlation across identifier access patterns.
• Alert on repeated 403 or 404 responses followed by successful 200 responses on the same endpoint family, indicating identifier probing.
• Monitor database query logs for SELECT operations that retrieve records outside the authenticated user's scope.

How to Mitigate CVE-2026-11763

Immediate Actions Required

• Contact Gis Informatics Engineering Consulting Laboratory R&D and Software Services Inc. to confirm the fixed release version and apply the vendor patch.
• Restrict network access to the GisLab Laboratory Management System to trusted networks and VPN clients until a patch is applied.
• Review recent application and database access logs for evidence of unauthorized cross-user record retrieval.

Patch Information

Refer to the Siber Güvenlik Notification TR-26-0573 advisory for vendor remediation guidance. Upgrade GisLab Laboratory Management System beyond the affected version 08072026 when the vendor releases a fixed build.

Workarounds

• Enforce short session lifetimes and rotate credentials for all accounts to limit the window an attacker can enumerate identifiers.
• Place the application behind a reverse proxy or WAF that validates request parameters and rate-limits authenticated resource access.
• Audit user accounts and disable those that are inactive, shared, or no longer required to reduce the pool of accounts an attacker could abuse.

# Example WAF rate-limit rule for authenticated resource enumeration (ModSecurity syntax)
SecRule REQUEST_URI "@rx ^/api/(records|samples|reports)/[0-9]+$" \
    "id:1010026,phase:1,pass,nolog,\
     setvar:ip.reqcount=+1,expirevar:ip.reqcount=60"
SecRule IP:REQCOUNT "@gt 60" \
    "id:1010027,phase:1,deny,status:429,\
     msg:'Excessive object ID access - possible IDOR enumeration'"