CVE-2025-15626: Ribblr iOS Auth Bypass Vulnerability

CVE-2025-15626 Overview

CVE-2025-15626 is an authorization bypass vulnerability affecting the Ribblr - Crochet & Knitting iOS mobile application. This vulnerability allows authenticated users to bypass authorization controls, potentially enabling access to resources or functionality beyond their intended permissions.

The vulnerability is classified as CWE-639 (Authorization Bypass Through User-Controlled Key), indicating that the application fails to properly validate user authorization when processing requests, allowing attackers to manipulate identifiers or keys to access unauthorized data or functions.

Critical Impact
Authenticated users can bypass authorization controls to access unauthorized resources, potentially compromising data confidentiality within the Ribblr iOS application.

Affected Products

Ribblr - Crochet & Knitting iOS Application

Discovery Timeline

2026-04-27 - CVE-2025-15626 published to NVD
2026-04-27 - Last updated in NVD database

Technical Details for CVE-2025-15626

Vulnerability Analysis

This vulnerability falls under the category of Insecure Direct Object References (IDOR), a common authorization flaw in web and mobile applications. The Ribblr iOS application fails to properly validate that an authenticated user has the appropriate permissions to access specific resources before fulfilling requests.

When users interact with the application, requests are made to backend services that reference specific objects or resources. The vulnerability exists because the application relies on user-controlled parameters to determine which resources to access without adequate server-side authorization checks.

An attacker who has a valid authenticated session can manipulate these request parameters to reference objects belonging to other users or access functionality they should not have permission to use. This could potentially expose private patterns, user information, or other sensitive data stored within the Ribblr platform.

Root Cause

The root cause of this vulnerability is improper authorization validation (CWE-639). The application fails to verify that the authenticated user has legitimate access rights to the requested resource before processing the request. Instead of implementing proper object-level authorization checks, the application appears to trust user-supplied identifiers without validating ownership or permission levels.

This type of vulnerability commonly occurs when developers assume that authentication alone is sufficient for security, neglecting to implement granular authorization checks for each resource access operation.

Attack Vector

The attack vector for this vulnerability is network-based and requires the attacker to have valid authentication credentials for the Ribblr iOS application. The exploitation process involves:

The attacker authenticates to the Ribblr iOS application with a valid account
The attacker intercepts or analyzes API requests made by the application
By modifying resource identifiers or parameters in these requests, the attacker can attempt to access resources belonging to other users
The server fails to validate authorization, returning unauthorized data or allowing unauthorized actions

Since no verified proof-of-concept code is available, the specific API endpoints and parameters involved have not been publicly disclosed. Organizations using this application should refer to the Ribblr platform for official guidance on any security updates.

Detection Methods for CVE-2025-15626

Indicators of Compromise

Unusual API request patterns from authenticated users attempting to access resources outside their normal scope
Multiple sequential requests with incrementing or modified resource identifiers from a single session
Access log entries showing users retrieving data for resources they do not own
Anomalous traffic patterns indicating systematic enumeration of resource identifiers

Detection Strategies

Implement API monitoring to detect requests with manipulated resource identifiers
Deploy behavioral analytics to identify users accessing abnormal numbers of distinct resources
Enable detailed logging of all authorization-related decisions and failures
Monitor for patterns of authorization failures followed by successful unauthorized access

Monitoring Recommendations

Enable comprehensive API request logging including user identifiers and accessed resource IDs
Implement real-time alerting for authorization bypass attempts
Review access logs regularly for signs of IDOR exploitation
Deploy application-layer monitoring to track user access patterns across the platform

How to Mitigate CVE-2025-15626

Immediate Actions Required

Update the Ribblr iOS application to the latest available version from the App Store
Review application permissions and ensure users only have access to necessary resources
Monitor for suspicious activity from authenticated users accessing unauthorized resources
Consider implementing additional server-side authorization controls if available

Patch Information

No specific patch information has been released at this time. Users should monitor the Ribblr platform for security updates and apply any available patches as soon as they are released.

Organizations should ensure automatic updates are enabled for the iOS application to receive security fixes promptly.

Workarounds

Limit sensitive data exposure within the application where possible
Implement network-level monitoring for API traffic to detect exploitation attempts
Review and restrict user account permissions to minimize potential impact
Consider temporary access restrictions for sensitive features until a patch is available

Organizations should implement defense-in-depth strategies including network monitoring and endpoint detection to identify potential exploitation attempts while awaiting an official patch from the vendor.