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CVE-2025-15626 Ribblr CVE debrief

An authorization bypass vulnerability exists in the Ribblr - Crochet & Knitting iOS application. An authenticated user can bypass authorization controls, potentially gaining unauthorized access to resources or functionality within the application. The vulnerability has been assigned a CVSS 4.0 score of 5.3 (Medium severity). The weakness is categorized as CWE-639: Authorization Bypass Through User-Controlled Key. The CVE record was published on April 27, 2026, and last modified on May 19, 2026. The vulnerability status in NVD is currently marked as 'Deferred'.

Vendor
Ribblr
Product
Crotchet and Knitting
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-27
Original CVE updated
2026-05-19
Advisory published
2026-04-27
Advisory updated
2026-05-19

Who should care

Organizations with users of the Ribblr iOS application, mobile application security teams, iOS developers implementing authorization controls, and security researchers tracking mobile application vulnerabilities.

Technical summary

The vulnerability allows an authenticated user to bypass authorization controls in the Ribblr - Crochet & Knitting iOS application. The underlying weakness (CWE-639) suggests that user-controlled input may influence authorization decisions without proper validation. This could enable privilege escalation or unauthorized access to protected resources within the application context.

Defensive priority

medium

Recommended defensive actions

  • Review and verify authorization controls in the Ribblr iOS application, particularly focusing on user-controlled key validation
  • Monitor for vendor security advisories or application updates from Ribblr
  • Apply security patches when released by the vendor
  • Implement additional monitoring for anomalous authenticated user behavior within the application
  • Conduct security assessments of similar authorization flows in related mobile applications

Evidence notes

The vulnerability affects the Ribblr iOS application. The vendor identification is based on reference domain analysis with low confidence and requires review. The primary weakness is CWE-639 (Authorization Bypass Through User-Controlled Key). No Known Exploited Vulnerabilities (KEV) listing or ransomware campaign associations have been identified.

Official resources

This CVE was published on April 27, 2026, and last modified on May 19, 2026. The NVD entry status is 'Deferred', indicating the vulnerability is awaiting further analysis or vendor coordination.