The SentinelOne Annual Threat Report - A Defenders Guide from the FrontlinesThe SentinelOne Annual Threat ReportGet the Report
Experiencing a Breach?Blog
Get StartedContact Us
SentinelOne
  • Platform
    Platform Overview
    • Singularity Platform
      Welcome to Integrated Enterprise Security
    • AI for Security
      Leading the Way in AI-Powered Security Solutions
    • Securing AI
      Accelerate AI Adoption with Secure AI Tools, Apps, and Agents.
    • How It Works
      The Singularity XDR Difference
    • Singularity Marketplace
      One-Click Integrations to Unlock the Power of XDR
    • Pricing & Packaging
      Comparisons and Guidance at a Glance
    Data & AI
    • Purple AI
      Accelerate SecOps with Generative AI
    • Singularity Hyperautomation
      Easily Automate Security Processes
    • AI-SIEM
      The AI SIEM for the Autonomous SOC
    • Singularity Data Lake
      AI-Powered, Unified Data Lake
    • Singularity Data Lake for Log Analytics
      Seamlessly Ingest Data from On-Prem, Cloud or Hybrid Environments
    Endpoint Security
    • Singularity Endpoint
      Autonomous Prevention, Detection, and Response
    • Singularity XDR
      Native & Open Protection, Detection, and Response
    • Singularity RemoteOps Forensics
      Orchestrate Forensics at Scale
    • Singularity Threat Intelligence
      Comprehensive Adversary Intelligence
    • Singularity Vulnerability Management
      Application & OS Vulnerability Management
    • Singularity Identity
      Identity Threat Detection and Response
    Cloud Security
    • Singularity Cloud Security
      Block Attacks with an AI-Powered CNAPP
    • Singularity Cloud Native Security
      Secure Cloud and Development Resources
    • Singularity Cloud Workload Security
      Real-Time Cloud Workload Protection Platform
    • Singularity Cloud Data Security
      AI-Powered Threat Detection for Cloud Storage
    • Singularity Cloud Security Posture Management
      Detect and Remediate Cloud Misconfigurations
    Securing AI
    • Prompt Security
      Secure AI Tools Across Your Enterprise
  • Why SentinelOne?
    Why SentinelOne?
    • Why SentinelOne?
      Cybersecurity Built for What’s Next
    • Our Customers
      Trusted by the World’s Leading Enterprises
    • Industry Recognition
      Tested and Proven by the Experts
    • About Us
      The Industry Leader in Autonomous Cybersecurity
    Compare SentinelOne
    • Arctic Wolf
    • Broadcom
    • CrowdStrike
    • Cybereason
    • Microsoft
    • Palo Alto Networks
    • Sophos
    • Splunk
    • Trellix
    • Trend Micro
    • Wiz
    Verticals
    • Energy
    • Federal Government
    • Finance
    • Healthcare
    • Higher Education
    • K-12 Education
    • Manufacturing
    • Retail
    • State and Local Government
  • Services
    Managed Services
    • Managed Services Overview
      Wayfinder Threat Detection & Response
    • Threat Hunting
      World-Class Expertise and Threat Intelligence
    • Managed Detection & Response
      24/7/365 Expert MDR Across Your Entire Environment
    • Incident Readiness & Response
      DFIR, Breach Readiness, & Compromise Assessments
    Support, Deployment, & Health
    • Technical Account Management
      Customer Success with Personalized Service
    • SentinelOne GO
      Guided Onboarding & Deployment Advisory
    • SentinelOne University
      Live and On-Demand Training
    • Services Overview
      Comprehensive Solutions for Seamless Security Operations
    • SentinelOne Community
      Community Login
  • Partners
    Our Network
    • MSSP Partners
      Succeed Faster with SentinelOne
    • Singularity Marketplace
      Extend the Power of S1 Technology
    • Cyber Risk Partners
      Enlist Pro Response and Advisory Teams
    • Technology Alliances
      Integrated, Enterprise-Scale Solutions
    • SentinelOne for AWS
      Hosted in AWS Regions Around the World
    • Channel Partners
      Deliver the Right Solutions, Together
    • SentinelOne for Google Cloud
      Unified, Autonomous Security Giving Defenders the Advantage at Global Scale
    • Partner Locator
      Your Go-to Source for Our Top Partners in Your Region
    Partner Portal→
  • Resources
    Resource Center
    • Case Studies
    • Data Sheets
    • eBooks
    • Reports
    • Videos
    • Webinars
    • Whitepapers
    • Events
    View All Resources→
    Blog
    • Feature Spotlight
    • For CISO/CIO
    • From the Front Lines
    • Identity
    • Cloud
    • macOS
    • SentinelOne Blog
    Blog→
    Tech Resources
    • SentinelLABS
    • Ransomware Anthology
    • Cybersecurity 101
  • About
    About SentinelOne
    • About SentinelOne
      The Industry Leader in Cybersecurity
    • Investor Relations
      Financial Information & Events
    • SentinelLABS
      Threat Research for the Modern Threat Hunter
    • Careers
      The Latest Job Opportunities
    • Press & News
      Company Announcements
    • Cybersecurity Blog
      The Latest Cybersecurity Threats, News, & More
    • FAQ
      Get Answers to Our Most Frequently Asked Questions
    • DataSet
      The Live Data Platform
    • S Foundation
      Securing a Safer Future for All
    • S Ventures
      Investing in the Next Generation of Security, Data and AI
  • Pricing
Get StartedContact Us
CVE Vulnerability Database
Vulnerability Database/CVE-2026-27257

CVE-2026-27257: Adobe Experience Manager XSS Vulnerability

CVE-2026-27257 is a stored Cross-Site Scripting vulnerability in Adobe Experience Manager that lets low-privileged attackers inject malicious scripts. This article covers technical details, affected versions, impact, and mitigation.

Published: March 13, 2026

CVE-2026-27257 Overview

Adobe Experience Manager (AEM) versions 6.5.23 and earlier contain a stored Cross-Site Scripting (XSS) vulnerability that allows low-privileged attackers to inject malicious scripts into vulnerable form fields. When victims browse to pages containing the compromised fields, the injected JavaScript executes in their browser context, potentially enabling session hijacking, credential theft, or unauthorized actions on behalf of the user.

Critical Impact

Authenticated attackers with low privileges can inject persistent malicious scripts that execute in victims' browsers, potentially compromising user sessions and sensitive data across the AEM platform.

Affected Products

  • Adobe Experience Manager versions 6.5.23 and earlier
  • Adobe Experience Manager 6.5 LTS (all service packs)
  • Adobe Experience Manager AEM Cloud Service

Discovery Timeline

  • 2026-03-11 - CVE-2026-27257 published to NVD
  • 2026-03-11 - Last updated in NVD database

Technical Details for CVE-2026-27257

Vulnerability Analysis

This stored XSS vulnerability (CWE-79) in Adobe Experience Manager stems from insufficient input validation and output encoding in form field components. Unlike reflected XSS attacks that require victim interaction with malicious links, stored XSS persists within the application database, making it particularly dangerous as the malicious payload executes automatically when any user views the affected page.

The attack requires network access and low-privilege authentication to the AEM platform. While user interaction is needed for exploitation (victims must navigate to the compromised page), the scope extends beyond the vulnerable component, potentially affecting other users and sessions within the AEM environment.

Root Cause

The vulnerability exists due to improper neutralization of user-supplied input before it is stored and subsequently rendered in web pages. Form fields within AEM fail to adequately sanitize special characters and script tags, allowing attackers to embed executable JavaScript that bypasses security controls. When the stored content is retrieved and displayed, the application does not properly encode the output, resulting in script execution within the victim's browser context.

Attack Vector

The attack follows a network-based exploitation path requiring authentication. A low-privileged attacker submits crafted input containing malicious JavaScript through vulnerable form fields in the AEM interface. The application stores this unvalidated input in its database. Subsequently, when any user—including administrators—accesses the page containing the malicious field, the JavaScript executes with the victim's privileges.

This can lead to session token theft, credential harvesting via fake login forms, unauthorized content modification, or redirection to attacker-controlled sites. The persistence of stored XSS means the attack remains active until the malicious content is discovered and removed.

Detection Methods for CVE-2026-27257

Indicators of Compromise

  • Unusual JavaScript content within AEM form field database entries
  • Unexpected script tags or event handlers (onerror, onload, onclick) in stored user input
  • Browser console errors or unexpected network requests to external domains
  • Reports from users experiencing unexpected redirects or popup behaviors

Detection Strategies

  • Implement Content Security Policy (CSP) headers with strict directives to detect and block inline script execution
  • Deploy web application firewall (WAF) rules to identify XSS payload patterns in form submissions
  • Enable AEM audit logging to monitor form field modifications by low-privileged users
  • Conduct regular security scans of AEM content repositories for suspicious script patterns

Monitoring Recommendations

  • Monitor AEM access logs for unusual patterns of form field updates from low-privileged accounts
  • Implement browser-based detection for CSP violations that may indicate XSS attempts
  • Set up alerts for database entries containing potentially malicious script content
  • Review AEM user activity logs for bulk or automated form field modifications

How to Mitigate CVE-2026-27257

Immediate Actions Required

  • Update Adobe Experience Manager to the latest patched version as specified in APSB26-24
  • Audit existing form field content for any previously injected malicious scripts
  • Implement Content Security Policy headers with strict script-src directives
  • Review and restrict privileges for users with form field editing capabilities

Patch Information

Adobe has released a security update addressing this vulnerability as documented in Adobe Security Advisory APSB26-24. Organizations should apply the patch immediately and verify successful remediation. For AEM Cloud Service deployments, ensure your environment is updated to the latest release that includes the fix.

Workarounds

  • Enable and configure strict Content Security Policy headers to prevent inline script execution
  • Implement server-side input validation and output encoding for all form fields
  • Restrict form field editing permissions to trusted, high-privilege users only
  • Deploy a web application firewall with XSS-specific rule sets to filter malicious input
bash
# Example CSP header configuration for Apache (httpd.conf or .htaccess)
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'self';"

Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.

  • Vulnerability Details
  • TypeXSS

  • Vendor/TechAdobe Experience Manager

  • SeverityMEDIUM

  • CVSS Score5.4

  • EPSS Probability0.03%

  • Known ExploitedNo
  • CVSS Vector
  • CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
  • Impact Assessment
  • ConfidentialityLow
  • IntegrityLow
  • AvailabilityNone
  • CWE References
  • CWE-79
  • Vendor Resources
  • Adobe Security Advisory APSB26-24
  • Related CVEs
  • CVE-2026-27248: Adobe Experience Manager XSS Vulnerability

  • CVE-2026-27247: Adobe Experience Manager XSS Vulnerability

  • CVE-2026-27244: Adobe Experience Manager XSS Vulnerability

  • CVE-2026-27242: Adobe Experience Manager XSS Vulnerability
Experience the World’s Most Advanced Cybersecurity Platform

Experience the World’s Most Advanced Cybersecurity Platform

See how our intelligent, autonomous cybersecurity platform can protect your organization now and into the future.

Try SentinelOne
  • Get Started
  • Get a Demo
  • Product Tour
  • Why SentinelOne
  • Pricing & Packaging
  • FAQ
  • Contact
  • Contact Us
  • Customer Support
  • SentinelOne Status
  • Language
  • Platform
  • Singularity Platform
  • Singularity Endpoint
  • Singularity Cloud
  • Singularity AI-SIEM
  • Singularity Identity
  • Singularity Marketplace
  • Purple AI
  • Services
  • Wayfinder TDR
  • SentinelOne GO
  • Technical Account Management
  • Support Services
  • Verticals
  • Energy
  • Federal Government
  • Finance
  • Healthcare
  • Higher Education
  • K-12 Education
  • Manufacturing
  • Retail
  • State and Local Government
  • Cybersecurity for SMB
  • Resources
  • Blog
  • Labs
  • Case Studies
  • Videos
  • Product Tours
  • Events
  • Cybersecurity 101
  • eBooks
  • Webinars
  • Whitepapers
  • Press
  • News
  • Ransomware Anthology
  • Company
  • About Us
  • Our Customers
  • Careers
  • Partners
  • Legal & Compliance
  • Security & Compliance
  • Investor Relations
  • S Foundation
  • S Ventures

©2026 SentinelOne, All Rights Reserved.

Privacy Notice Terms of Use

English