Preliminary research

Compromising Cleo Harmony: A SAML Bypass Chain to Arbitrary Code Execution

Ilyass El Hadi · Armadin · 2 September 2026

AI-collected research leads through 3 November 2026, including a November–October–September missed-article review and a targeted multilingual search alongside earlier community-source sweeps. Unranked, incomplete, not community-vetted, and subject to change.

Armadin chains a replayable SAML XML Signature Wrapping flaw with last-write-wins email lookup, forced UNI_ADMIN refresh-token issuance, and cross-store identity confusion to become Cleo Harmony's default administrator. The administrator can then invoke the built-in Actions SYSTEM verb for host command execution; the article also gives detection and mitigation guidance.

Record

Researcher

Ilyass El Hadi

Published by

Armadin

Date

2 September 2026

In the archive

• Collected in the 2026 preliminary research sweep

Tags

• saml
• sso
• auth-bypass
• signature-verification
• signature-replay
• identity
• privilege-escalation
• attack-chain
• abuse-of-functionality
• rce
• owasp-a01-2021
• owasp-a04-2021
• owasp-a07-2021

This page is the archive's own catalogue record. The research is the work of Ilyass El Hadi, first published at the original source. Preserved copies are kept so the citation survives its host.