Critical Adobe Commerce Session Hijack Flaw Added to KEV After Active Exploitation
Adobe released an out-of-band fix for CVE-2025-54236, a critical improper input validation flaw in Adobe Commerce, Adobe Commerce B2B, and Magento Open Source that allows unauthenticated attackers to take over user sessions through vulnerable session-handling and Web API components. The bug, dubbed "SessionReaper" by Sansec, carries a reported CVSS 9.1 rating and can lead to account hijacking, exposure of customer data, fraudulent orders, administrative access, and in some scenarios potentially remote code execution. Affected releases span multiple 2.4.x branches, including versions from 2.4.4 through 2.4.7 and other listed builds and earlier releases.
Security guidance escalated after reports said the flaw was being actively exploited in the wild and added to CISA's Known Exploited Vulnerabilities catalog. Adobe published remediation details in APSB25-88 and shipped patched versions, while defenders were urged to apply the vendor fix immediately, verify patch status, review logs for anomalous session activity, tighten administrative access, and increase WAF, API, and SIEM monitoring. Advisories also warned that leaked hotfix details and unofficial fixes could accelerate attacker weaponization or create additional risk.
Timeline
Mar 11, 2026
CVE-2025-54236 added to CISA KEV amid active exploitation
By March 2026, the vulnerability was reported as actively exploited in the wild and had been added to CISA’s Known Exploited Vulnerabilities catalog. This marked an escalation from earlier reporting that had not yet observed exploitation.
Jan 1, 2026
Adobe issues out-of-band patch for CVE-2025-54236
Adobe released Security Advisory APSB25-88 and patched affected Adobe Commerce, Adobe Commerce B2B, and Magento Open Source versions for the critical auth bypass/session takeover flaw CVE-2025-54236. Early reporting described the issue as severe and urged customers to apply the emergency hotfix immediately.
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