CVE-2026-21290Network attack vector

Session takeover via stored form-field scripts

Published Mar 11, 2026 · Updated Mar 11, 2026

Stored XSS in Adobe Commerce 2.4.9-alpha3 and earlier allows remote authenticated users to hijack sessions through crafted form fields. Adobe identifies stored scripts in vulnerable form fields but has not published the field names or the code path that fails to neutralize the content. Low-privileged access is sufficient, and execution requires a victim to open the affected page; successful exploitation compromises the victim's session confidentiality and integrity.

CVSS severity8.7
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Adobe Commerce 2.4.9-alpha3 and earlier allows remote authenticated users to hijack sessions through crafted form fields. Adobe identifies stored scripts in vulnerable form fields but has not published the field names or the code path that fails to neutralize the content. Low-privileged access is sufficient, and execution requires a victim to open the affected page; successful exploitation compromises the victim's session confidentiality and integrity.

The record

CVE
CVE-2026-21290
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
Adobe
Product
Adobe Commerce
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.4.4-p16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Adobe · Adobe Commerceversion=0 <=2.4.4-p16

Published CVSS scores

8.7AdobeCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo