CVE-2026-21290 Adobe Commerce | Cross-site Scripting (Stored XSS) (CWE-79)

High 8.7 Published 11 Mar 2026 Updated 27 Aug 2026

A low-privileged attacker can inject malicious scripts into Adobe Commerce form fields, leading to session takeover when victims view the page.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-21290?

CVE-2026-21290 is a high-severity cross-site scripting vulnerability in Adobe Commerce, published on 11 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

Adobe Commerce versions 2.4.9-alpha3, 2.4.8-p3, 2.4.7-p8, 2.4.6-p13, 2.4.5-p15, 2.4.4-p16 and earlier are affected by a stored Cross-Site Scripting (XSS) vulnerability that could be abused by a low-privileged attacker to inject malicious scripts into vulnerable form fields. Malicious JavaScript may be executed in a victim’s browser when they browse to the page containing the vulnerable field. A successful attacker can abuse this to achieve session takeover, increasing the confidentiality, and integrity impact to high. Exploitation of this issue requires user interaction in that a victim must browse to the page containing the vulnerable field.

Weakness: CWE-79

Which versions are affected by CVE-2026-21290?

It affects 3 products.

Products include Adobe Commerce, Adobe Commerce B2b, Adobe Magento.

How do I fix CVE-2026-21290?

No fix has been published for CVE-2026-21290 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-21290 being exploited?

There is no known exploitation of CVE-2026-21290 in the wild and no public exploit code.

All Adobe Commerce vulnerabilities

Sources

Also known as GHSA-mf9f-hcmh-j5wr.