CVE-2026-77109: 
Adobe Commerce vulnerability analysis and mitigation

CVE-2026-77109 is an Incorrect Authorization vulnerability (CWE-863) in Adobe Commerce, Adobe Commerce B2B, and Magento Open Source that allows unauthenticated remote attackers to escalate privileges and gain elevated access to restricted resources. The vulnerability was published on September 8, 2026, and affects Adobe Commerce versions up to and including the August 2026 patch releases across the 2.4.4 through 2.4.9 lines, Adobe Commerce B2B versions 1.3.3 through 1.5.3 (August 2026 releases), and Magento Open Source versions up to 2.4.9 (August 2026 release). It carries a CVSS v3.1 base score of 8.6 (High), with scope change noted (Adobe Advisory, Feedly).

The root cause is an Incorrect Authorization flaw (CWE-863), meaning the application fails to properly verify whether a requester has the necessary permissions before granting access to restricted resources. The attack vector is network-based, requires no authentication, no user interaction, and low attack complexity, making it highly automatable. The changed scope indicator suggests that a successful exploit can affect resources beyond the vulnerable component itself — for example, impacting other system components or tenants within the Commerce environment. No specific technical write-up or proof-of-concept code has been publicly disclosed at this time (Feedly).

Successful exploitation allows an unauthenticated network attacker to gain elevated privileges within Adobe Commerce, potentially accessing and modifying restricted data or administrative resources. The primary impact is on integrity (rated High), with no direct confidentiality or availability impact per the CVSS scoring; however, privilege escalation in an e-commerce platform can enable unauthorized order manipulation, customer data access, or configuration changes. The changed scope means the impact may extend beyond the directly vulnerable component, increasing the risk of lateral movement within the Commerce environment (Feedly).

No public proof-of-concept exploit code has been identified, and there is no evidence of active in-the-wild exploitation as of the time of disclosure. The EPSS score is approximately 0.0041 (low probability of exploitation in the near term). The vulnerability is classified as automatable by NVD SSVC analysis, meaning exploitation could be scripted at scale. It has not been added to the CISA Known Exploited Vulnerabilities (KEV) catalog. No specific threat actor attribution has been reported (Feedly).

Adobe has released September 2026 security patches addressing this vulnerability across all affected product lines. Administrators should update to the September 2026 patch releases: Adobe Commerce 2.4.4-sep, 2.4.5-sep, 2.4.6-sep, 2.4.7-sep, 2.4.8-sep, or 2.4.9-sep; Adobe Commerce B2B 1.3.3-sep, 1.3.4-sep, 1.4.2-sep, 1.5.2-sep, or 1.5.3-sep; and Magento Open Source 2.4.7-sep, 2.4.8-sep, or 2.4.9-sep. As interim measures, administrators should implement network segmentation to restrict access to administrative interfaces and review access logs for unauthorized privilege escalation attempts (Adobe Advisory).

The vulnerability was covered by multiple security aggregators and advisories shortly after disclosure, including AusCERT, CIS, and INCIBE-CERT, as part of broader coverage of Adobe's September 2026 security patch release. CIS issued an advisory noting that multiple vulnerabilities in Adobe products could allow for arbitrary code execution, grouping this CVE with others in the same release cycle (CIS Advisory). No notable individual researcher commentary or significant social media discussion specific to this CVE has been identified beyond routine aggregation.