CVE-2026-91013: Adobe Commerce Stored XSS Vulnerability

CVE-2026-91013 Overview

Adobe Commerce contains a stored Cross-Site Scripting (XSS) vulnerability [CWE-79] that allows attackers to inject malicious JavaScript into vulnerable form fields. When a victim loads a page rendering the tainted field, the attacker's script executes in the victim's browser context. Successful exploitation can lead to session hijacking, account takeover, and elevated access within the Commerce application. The vulnerability carries a changed scope, meaning injected code can affect components beyond the originally vulnerable one. Adobe published the issue in security advisory APSB26-153.

Critical Impact
Attackers can execute arbitrary JavaScript in authenticated users' browsers, including administrators, enabling account compromise and unauthorized access to Adobe Commerce storefronts and admin panels.

Affected Products

Adobe Commerce (see Adobe Security Advisory APSB26-153 for affected version ranges)
Adobe Commerce on-premise deployments
Adobe Commerce cloud-hosted deployments

Discovery Timeline

2026-10-13 - CVE-2026-91013 published to NVD
2026-10-14 - Last updated in NVD database

Technical Details for CVE-2026-91013

Vulnerability Analysis

The vulnerability is a stored XSS flaw in Adobe Commerce form field handling. Attackers submit crafted payloads containing JavaScript into form fields that are persisted by the application. When another user, including an administrator, later views a page that renders the stored content, the malicious script executes within the victim's browser session.

The attack requires network access and user interaction, since the victim must load a page that renders the injected payload. Attackers do not need prior authentication to introduce the payload through publicly exposed form fields. The scope change indicates the injected script can reach resources beyond the vulnerable component, including administrative sessions and other Commerce subsystems.

Root Cause

The root cause is improper neutralization of user-supplied input during web page generation [CWE-79]. Form field values are stored and later rendered without sufficient output encoding or input sanitization, allowing HTML and JavaScript constructs to execute instead of being treated as inert text.

Attack Vector

An attacker submits a form containing JavaScript payloads such as <script> tags, event handler attributes, or SVG-based vectors. The payload is persisted in the Adobe Commerce backend. When a legitimate user, typically a store administrator or merchant, navigates to a view that renders the stored field, the browser executes the attacker's JavaScript. The script runs with the victim's session cookies and privileges, enabling theft of session tokens, forced API calls, and manipulation of the administrative interface.

// No verified exploit code is publicly available for CVE-2026-91013.
// Refer to the Adobe Security Advisory APSB26-153 for vendor-provided details.

Detection Methods for CVE-2026-91013

Indicators of Compromise

Unexpected <script>, onerror, onload, or javascript: strings stored in Adobe Commerce database tables tied to form submissions.
Outbound HTTP requests from administrator browsers to unfamiliar domains shortly after loading Commerce admin pages.
Admin session tokens appearing in web server logs for requests originating from unexpected IP addresses.
Creation of new administrative accounts or modified role assignments without a corresponding change ticket.

Detection Strategies

Scan database fields that store form input for HTML tags, event handlers, and encoded script fragments.
Deploy Content Security Policy (CSP) reporting endpoints to capture script execution violations in admin and storefront views.
Enable web application firewall (WAF) rules that detect XSS payload patterns in POST and PUT requests to Commerce endpoints.
Correlate administrator session activity with abnormal API calls, especially customer, order, or user management endpoints.

Monitoring Recommendations

Forward Adobe Commerce application and web server logs to a centralized analytics platform for query-driven hunting.
Alert on administrative actions performed within seconds of loading a page that renders customer-submitted content.
Monitor for new or modified admin users, API keys, and integration tokens created outside documented change windows.

How to Mitigate CVE-2026-91013

Immediate Actions Required

Apply the Adobe Commerce security update referenced in Adobe Security Advisory APSB26-153 as a priority.
Audit stored form field data for existing malicious payloads and remove any injected scripts before administrators access affected views.
Rotate administrator credentials, API tokens, and integration keys if evidence of exploitation is found.
Restrict administrative access to known IP ranges and enforce multi-factor authentication for all admin accounts.

Patch Information

Adobe addressed the vulnerability in the updates listed under Adobe Security Advisory APSB26-153. Administrators should consult the advisory for the specific fixed versions applicable to their Adobe Commerce deployment and apply the corresponding patch.

Workarounds

Deploy a strict Content Security Policy that disallows inline scripts and restricts script sources on Commerce admin and storefront domains.
Place a WAF in front of Adobe Commerce with signatures tuned to block XSS payloads in form submissions.
Limit which users can submit content into fields rendered in administrative contexts until the patch is applied.

bash

# Example restrictive CSP header for Adobe Commerce responses
Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'