BHAVNAGAR, Gujarat, India, September 10, 2026 - Meetanshi Technologies LLP, an Adobe Partner and Hyvä Silver Partner specialising in Adobe Commerce and Magento development, is advising merchants to apply Adobe's September 2026 security update without delay, and to check their existing patch history before they do.
Adobe published security bulletin APSB26-138 on September 8, 2026. It addresses eight vulnerabilities across Adobe Commerce, Adobe Commerce B2B and Magento Open Source. Adobe rates all eight as Critical and has assigned the bulletin a Priority 2 rating. Adobe has stated it is not aware of any exploits in the wild for these specific issues.
Six of the eight vulnerabilities can be exploited without authentication. The two highest scored issues, CVE-2026-76200 and CVE-2026-76201, are stored cross site scripting flaws with a CVSS base score of 9.3 that Adobe lists as leading to privilege escalation. Five further issues are incorrect authorization flaws scoring between 7.5 and 8.7, and one is a path traversal flaw scoring 7.6.
Affected products include Adobe Commerce, Cloud and on-premises, 2.4.4 through 2.4.9, Adobe Commerce B2B 1.3.3 through 1.5.3, and Magento Open Source 2.4.6 through 2.4.9, in each case at the August 2026 patch level or earlier.
The sequencing risk
Meetanshi's technical team is highlighting a specific operational risk that it says is easy to miss under time pressure. Adobe distributes the September fixes as isolated patch files, one per version line, and states that each monthly isolated patch builds on the ones released before it and must be applied cumulatively, in release order. Adobe further states that the September 2026 patches build on top of the August 2026 patches, which must already be applied.
"Merchants read the word isolated and hear standalone, and it is neither," said Sanjay Jethva, Founder, CEO and CTO of Meetanshi and an Adobe Certified Developer who has worked with Magento since 2011. "If a store missed a cycle earlier this year and the team drops the September file on top, one of two things happens. It fails to apply cleanly, or it applies and the older holes stay open while the ticket gets closed as done. The second outcome is the dangerous one, because everyone believes the store is protected."
Adobe's guidance adds one further prerequisite. The critical hotfix released on September 7, 2026 is not included in the September isolated patch file, and Adobe instructs merchants to apply that hotfix first and the isolated patch afterwards.
Adobe publishes isolated patch files for 2.4.9, 2.4.8-p5, 2.4.7-p10, 2.4.6-p15, 2.4.5-p17 and 2.4.4-p18, available through repo.magento.com/patch/. Merchants can verify which CVEs their installation is protected against using Adobe's Commerce Version Tool, run with the command php vendor/bin/patch-status, which becomes available once the July 2026 patches are applied.
"Run the version tool before you patch and again after," Jethva added. "If the output does not confirm coverage for all eight CVEs, something did not land. That five second check settles the argument better than any release note."
Recommended approach
Meetanshi recommends merchants take a full backup with a tested restore, replicate production on staging including all third party extensions, apply missing prior isolated patches in release order oldest to newest, apply the September 7 hotfix, apply the September isolated patch, then verify coverage and test checkout, admin access, customer accounts and every integration before deploying to live in a maintenance window.
The company's Magento security patch installation service covers this sequence for merchants without the internal bandwidth to run it, including an audit of installed and missing patches, staging validation, and a zero downtime cutover to production. Details are available at https://meetanshi.com/magento-security-patches-installation-service.html
About Meetanshi
Meetanshi Technologies LLP is a full service ecommerce agency and module developer founded in 2017, with headquarters in Bhavnagar, Gujarat, India and an office in Stuttgart, Germany. The company builds Adobe Commerce, Magento 2, Hyvä and Shopify solutions, offering custom extension engineering, platform migrations, security management, ecommerce SEO and paid advertising optimisation. Meetanshi has published more than 240 pre built modules and extensions and serves over 13,000 stores worldwide. It is an Adobe Partner, a Hyvä Silver Partner and a Google Partner. The company was founded by Sanjay Jethva, Founder, CEO and CTO and an Adobe Certified Developer, and Shivbhadrasinh Gohil, Founder and CMO.
More information: https://meetanshi.com