Privilege Escalation Through REST API Authorization Bypass

A Missing Authorization vulnerability in Progress Software LoadMaster, ECS Connection Manager, Object Scale Connection Manager, MOVEit WAF, and Multi Tenant allows an authenticated attacker with low privileges to perform privileged administrative operations via the REST API that should not be accessible to their permission level, potentially resulting in a system compromise.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

CVE-2026-59690 is a missing authorization vulnerability affecting Progress Software's LoadMaster, ECS Connection Manager, Object Scale Connection Manager, MOVEit WAF, and Multi-Tenant platforms. An authenticated attacker with low privileges can exploit improperly secured REST API endpoints to perform administrative operations they should not have access to, bypassing authorization controls entirely. This matters because REST APIs are increasingly the primary attack surface for modern applications—a low-privilege account (like a standard user or contractor) can escalate to full system compromise without needing additional credentials. Organizations running these Progress products in production environments face significant risk, as the vulnerability requires only valid authentication, not special exploits or zero-days.

Casky's 283 matching skills detect the attack patterns behind this vulnerability by mapping to MITRE ATT&CK techniques TA0004 (Privilege Escalation) and TA0006 (Credential Access), using Claude's extended reasoning to analyze authorization failures in REST API traffic. Practitioners using Casky would see findings flagged for: (1) Privilege Escalation detection—low-privileged API tokens performing admin-level operations like user creation, permission modification, or system configuration changes; (2) unusual API endpoint access patterns where authenticated sessions access endpoints typically restricted to administrator roles; (3) anomalous API behavior indicating authorization enforcement bypasses. The platform's mapping to CWE-862 (Missing Authorization) provides context-specific detection rules, allowing security teams to identify compromised low-privilege accounts being weaponized for lateral movement or persistent access before system-wide damage occurs.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-59690.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-59690

Casky has 283 skills that investigate the attack patterns behind CVE-2026-59690. Run one and get CVSS-scored findings in 3 minutes.

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