An Adobe Commerce vulnerability, affecting Adobe’s e-commerce platform software, is rated 9.3 out of 10 by the reporting organization (CNA), according to the NVD record. That score follows the CVSS scale, the industry-wide severity rating system, version 3.1. Exploitation of this vulnerability has been confirmed by CISA, the US cybersecurity agency. If your online store runs on Adobe Commerce or Magento, have Adobe’s mitigations applied without delay.
What is it?
A flaw in the Adobe Commerce platform allows a dangerous file to be uploaded to the site, then executed with the permissions of the logged-in user.
CVE-2026-48356 falls under what the NVD record calls an unrestricted upload of a file with a dangerous type: the site accepts an uploaded file without adequately checking what it is. Picture the delivery door at the back of a shop left open like a garage door on a fall evening: anyone can drop off a box, and nobody checks what’s inside. According to the NVD record, exploitation requires victim interaction, such as visiting a malicious web address or an already-compromised page.
Why is it serious?
Because attacks are being observed, and an attacker can take over the account of a user of your store, or their session, meaning their open connection.
CISA added the vulnerability to its Known Exploited Vulnerabilities catalog on October 27, 2026: exploitation is therefore being observed in the wild. The Canadian Centre for Cyber Security flagged it in advisory AV26-697. In business terms: interrupted sales, customer information that could leak, and a risk of fraud if the access obtained belongs to an administrator, meaning an account that can change anything on the site. CISA calls for applying mitigations per the vendor’s instructions and, if none are available, discontinuing use of the product.
Who is affected?
Organizations whose online store runs on Adobe Commerce or Magento, both published by Adobe.
We do not have the list of affected versions or the number of the patched release. Those details should be checked in Adobe’s security bulletin and in Canadian advisory AV26-697. Across Canada, the vulnerability concerns organizations that sell online on this platform: retailers, wholesalers, parts distributors, manufacturers. When the site was built or is maintained by an outside provider, that is where the verification needs to happen.
How do I check my business?
Start with calls to your developer, your hosting provider, and your software vendor: these are the first checks to make.
- Ask whether the store runs on Adobe Commerce or Magento, and which version is installed (management, developer, or hosting provider).
- Ask on what date Adobe’s recommended mitigations were applied, and get the answer in writing (IT provider).
- Have the site’s logs, meaning the automatic record of logins and actions taken on the store, reviewed for any unusual activity (IT provider or outside specialist).
- Discuss fallback options, including a temporary shutdown, if no mitigation is available for your version (software vendor).
Scenario
Fictional example: an auto parts shop selling online had not applied the update.
On a Monday morning, the store starts showing errors and the weekend’s orders never reached the shop floor. The provider finds signs of abnormal access and takes the site offline while it investigates. The day is spent on the phone: calling customers back, rescheduling installation appointments. Because customer accounts were involved, management also has to assess whether personal information was affected.
The Adobe Commerce Vulnerability and Your Obligations in Quebec
In Quebec, the Act respecting the protection of personal information in the private sector requires organizations to keep a confidentiality incident register. Where there is a risk of serious harm, it also requires notifying the affected individuals and the Commission d’accès à l’information (Quebec’s privacy regulator). These obligations exist independently of any incident: knowing them in advance avoids improvising under pressure. It should be said plainly: no protection is absolute, and no provider can guarantee zero risk.
What to do now
- Apply Adobe’s published mitigations, following advisory AV26-697 from the Canadian Centre for Cyber Security.
- Have the site’s logs and administrator access reviewed.
- Prepare a fallback option if no mitigation covers your version.
- Record the checks performed and their dates, for management and for the incident register.
FAQ
Our site is hosted by a provider: are we affected?
Yes. Outside hosting does not remove the business’s responsibility for its customers’ information. Ask in writing: version installed, mitigations applied, date. A provider unable to answer clearly is already useful information.
We’re a small business, does this really apply to us?
Yes. Being added to CISA’s catalog means attacks are already being observed. We don’t have information on the scale of this exploitation or which organizations are being targeted: being a small shop is not a protection.
What if no mitigation exists for our version?
CISA then calls for discontinuing use of the product. In practice, that can mean taking the store offline while migrating to a supported version, meaning one the vendor still patches. Orders can then be taken by phone or email in the meantime. A planned interruption is better than one forced on you.
Sources
- CVE-2026-48356 record, National Vulnerability Database · NIST, July 14, 2026
- CISA, Known Exploited Vulnerabilities Catalog · CISA, added October 27, 2026
- Canadian Centre for Cyber Security: Adobe Security Bulletin (AV26-697), Update 1 · Canadian Centre for Cyber Security, October 27, 2026
- Adobe Security Bulletin (helpx.adobe.com) · helpx.adobe.com
- Commission d’accès à l’information du Québec · obligations, incident register, and notification
Source: NVD (NIST) · https://nvd.nist.gov/vuln/detail/CVE-2026-48356
Article prepared by RISS Canada’s intelligence monitoring team from the public sources cited above, with the assistance of AI tools, then reviewed according to our editorial policy.
