Zodiac has published a security incident report revealing a critical flaw in the ERC-1271 transaction signature verification logic. The vulnerability, affecting the Zodiac Roles Modifier, allowed attackers to bypass module authentication by exploiting the system's reliance on a "magic value" to determine signature validity. This oversight meant that failed verifications could be falsely recognized as valid, compromising the module's security. The report highlights the need for enhanced verification processes to ensure that signature checks are not solely dependent on the "magic value" but also confirm the success of the call itself. Zodiac's disclosure underscores the importance of rigorous security measures in smart contract implementations to prevent similar vulnerabilities.