CVE-2026-38568: HireFlow Privilege Escalation Vulnerability

CVE-2026-38568 Overview

CVE-2026-38568 is a broken access control vulnerability in HireFlow v1.2, an open-source interview management system. The application fails to enforce object-level authorization on the /candidate/<id> and /interview/<id> endpoints. Any authenticated user can retrieve another user's candidate profiles or interview notes by incrementing the integer ID in the URL path. This results in horizontal privilege escalation and full disclosure of every candidate and interview record stored in the system. The flaw is classified under CWE-639: Authorization Bypass Through User-Controlled Key.

Critical Impact

Authenticated attackers can enumerate integer IDs to exfiltrate every candidate profile and interview note in the database, exposing personally identifiable information (PII) and confidential hiring data.

Affected Products

• HireFlow v1.2 (StratonWebDesigners)
• HireFlow /candidate/<id> route handler
• HireFlow /interview/<id> route handler

Discovery Timeline

• 2026-05-11 - CVE-2026-38568 published to NVD
• 2026-05-12 - Last updated in NVD database

Technical Details for CVE-2026-38568

Vulnerability Analysis

The vulnerability is an Insecure Direct Object Reference (IDOR) in HireFlow v1.2. Route handlers for /candidate/<id> and /interview/<id> accept a user-supplied integer identifier and return the corresponding database record. The handlers do not verify that the requesting user owns the record or holds a role authorized to view it. An authenticated session is the only precondition for exploitation.

Because record IDs are sequential integers, an attacker can iterate predictable values to enumerate the entire dataset. Interview notes commonly contain candidate evaluations, salary discussions, and reviewer comments. Candidate profiles store contact information, resumes, and application history. The flaw enables both confidentiality and integrity impact across all tenants of the application.

Root Cause

The root cause is missing object-level authorization. The route handlers retrieve records by primary key without comparing the record's owner field against the session user. There is no role-based check for administrative access either. This pattern matches CWE-639, where authorization decisions rely on a user-controlled key instead of server-side ownership validation.

Attack Vector

An attacker authenticates to HireFlow using any valid account, including a self-registered one. The attacker then issues sequential HTTP GET requests against /candidate/1, /candidate/2, and so on, repeating the pattern for /interview/<id>. Each response returns the full record regardless of ownership. No special tooling is required beyond a browser or curl. The attack scales linearly with the size of the dataset and produces no application-level errors that would alert defenders.

See the CVE-2026-38568 disclosure repository and the HireFlow source repository for technical details.

Detection Methods for CVE-2026-38568

Indicators of Compromise

• Sequential HTTP GET requests to /candidate/<id> or /interview/<id> from a single authenticated session within a short time window.
• Access log entries showing one user account retrieving records across a wide range of IDs that do not belong to that account.
• Spikes in 200 OK responses on candidate or interview endpoints originating from non-administrative accounts.

Detection Strategies

• Deploy web application firewall (WAF) rules that flag rapid enumeration of integer path parameters on /candidate/ and /interview/ routes.
• Correlate the authenticated user ID against the owner of each accessed record in application logs and alert on mismatches.
• Establish a baseline of normal record access volume per user and alert on statistical outliers.

Monitoring Recommendations

• Forward HireFlow application and reverse proxy logs to a centralized SIEM for retention and correlation.
• Monitor authentication events alongside record access events to identify newly created accounts that immediately enumerate IDs.
• Track outbound data volume per session to detect bulk exfiltration of candidate data.

How to Mitigate CVE-2026-38568

Immediate Actions Required

• Restrict network access to the HireFlow application until an authorization fix is deployed.
• Audit existing accounts and revoke sessions for any user that accessed records outside their ownership scope.
• Review access logs for evidence of ID enumeration against /candidate/<id> and /interview/<id>.

Patch Information

No official vendor patch is referenced in the NVD entry at the time of publication. Operators should monitor the HireFlow GitHub repository for updates and apply object-level authorization checks in the affected route handlers.

Workarounds

• Add a server-side check in each route handler that compares the authenticated user ID against the owner_id field of the requested record before returning data.
• Replace sequential integer IDs with unpredictable identifiers such as UUIDs to make enumeration impractical as a defense-in-depth measure.
• Place the application behind an authenticating reverse proxy that enforces role-based access control on candidate and interview routes.

# Configuration example: nginx rate-limit to slow enumeration attempts
limit_req_zone $binary_remote_addr zone=hireflow_ids:10m rate=10r/m;

location ~ ^/(candidate|interview)/[0-9]+$ {
    limit_req zone=hireflow_ids burst=5 nodelay;
    proxy_pass http://hireflow_backend;
}