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CVE-2026-77109 – Privilege Escalation via Incorrect Authorization – Adobe Commerce / Magento Open So

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Summary

CVE-2026-77109 is an Incorrect Authorization vulnerability (CWE-863) affecting Adobe Commerce, Adobe Commerce B2B, and Magento Open Source. The flaw allows an attacker to escalate privileges and gain unauthorized access to restricted resources without requiring authentication or any victim interaction. Adobe rates the issue High severity (CVSS 3.1 base score 8.6) and disclosed it alongside a separate, unrelated critical remote code execution flaw in the same product line.

Technical details

  • Root cause: The application fails to correctly enforce authorization checks on certain functionality, allowing a user or unauthenticated actor to access resources or perform actions that should be restricted to higher-privileged roles (CWE-863 – Incorrect Authorization).
  • Trigger conditions: No prior authentication or privileges are required to trigger the flaw (PR:N), and no user interaction is needed (UI:N).
  • Attack vector: Network-based (AV:N) with low attack complexity (AC:L), meaning it can be exploited remotely over the network without special conditions.
  • Impact: The vulnerability results in privilege escalation with a confidentiality impact only under a changed scope (S:C, C:H per CVSS vector), meaning the attacker can gain unauthorized access to data or functionality belonging to another security scope (e.g., beyond the vulnerable component itself), without affecting integrity or availability.
  • The issue was reported to Adobe by the researcher known as 0x0.eth (0x0doteth), alongside two related CVEs (CVE-2026-76200 and CVE-2026-76201) disclosed in the same Adobe security bulletin.

Affected software

  • Adobe Commerce: versions up to 2.4.9-2026-aug (and earlier feature-branch builds) — fixed in 2.4.4-2026-sep and later cumulative updates
  • Adobe Commerce B2B: versions up to 1.5.3-2026-aug — fixed in 1.3.3-2026-sep and later
  • Magento Open Source: versions up to 2.4.9-2026-aug — fixed in 2.4.7-2026-sep and later

Severity

  • CVSS v3.1 Base Score: 8.6 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: Upgrade Adobe Commerce, Adobe Commerce B2B, and Magento Open Source installations to the fixed versions specified in Adobe’s security bulletin (2.4.7-2026-sep, 2.4.4-2026-sep, or 1.3.3-2026-sep as applicable to your product/branch), applying the vendor-provided patch through the standard Composer-based update process.
  • If immediate patching is not possible: Restrict administrative and API endpoint access to trusted networks/IP ranges, enforce strong authentication on admin panels, and closely monitor access and authorization logs for anomalous privilege-related activity until the patch can be applied.
  • Given that this bulletin was released alongside actively exploited vulnerabilities in the same product line, organizations should treat patching as urgent and verify no signs of prior compromise (e.g., unexpected admin accounts, unauthorized configuration changes) exist before and after remediation.

References

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