CVE-2026-48300: Adobe Experience Manager Stored XSS in Form Fields

Technical summary

This stored XSS vulnerability (CWE-79) exists in Adobe Experience Manager's form field processing logic. An authenticated attacker with low privileges can inject malicious script payloads into vulnerable form fields; these payloads persist in the application's data store. When any user—including administrators or other victims—navigates to a page rendering the compromised form field, the malicious script executes in their browser context. The CVSS 3.1 vector (5.4 MEDIUM, AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) reflects that the attack requires network access, low privilege level, user interaction, and results in scope change with confidentiality and integrity impact. The scope change indicates the vulnerability can affect security properties of components beyond the vulnerable component itself.

Business impact

Stored XSS in Experience Manager poses significant risk to organizations using AEM for content management and digital asset delivery. Attackers can deface content visible to customers, inject credential-stealing forms, or redirect users to malicious sites. If authors or administrators interact with compromised content, attackers gain foothold for lateral movement and privilege escalation. For customer-facing digital experiences, this damages brand trust and may trigger compliance violations (GDPR, PCI-DSS). The low barrier to entry (low-privilege attacker) and persistence of injected payloads make this a sustained threat until patched.

Affected systems

The vulnerability affects Adobe Experience Manager in versions 6.5.24, LTS SP1, 2026.04, and all earlier versions within those release tracks. Organizations running any of these versions with form-based content or user input fields are in scope. The impact extends to any end user or administrator viewing pages that contain the malicious payload, not just the account that injected it.

Exploitability

Exploitation is straightforward and requires only low privileges within Experience Manager. An attacker needs valid credentials (author-level access) and ability to edit or create form fields. User interaction is required—the victim must browse to a page containing the malicious form field—but this is highly likely in normal content consumption workflows. No complex interaction chains are needed; a single malicious form field can affect many users over time. The network-accessible nature of AEM makes this remotely exploitable without requiring local system access.

Remediation

Adobe has issued security updates to address this vulnerability. Organizations must upgrade to patched versions of Experience Manager as specified in the official Adobe Security Bulletin. Immediate actions include identifying all AEM instances in the environment and their current versions, prioritizing patching for externally facing or high-value content systems. Pending patch deployment, consider restricting form editing permissions to trusted administrators and monitoring form field modifications for suspicious content.

Patch guidance

Consult the official Adobe Experience Manager security advisory for version-specific patch availability. Organizations should verify the exact patched version numbers from Adobe's advisory, as different release tracks (6.5.x, LTS, 2026.x) may have different update schedules. After patching, sanitization of existing form field data is recommended to remove any previously injected payloads. Test patches in non-production environments before rollout to validate content integrity and application functionality.

Detection guidance

Monitor Experience Manager audit logs for form field creation or modification by low-privileged accounts, especially unusual patterns or rapid bulk changes. Search existing form field content for common XSS patterns such as <script>, javascript:, onerror=, onload=, and other event handlers. Web application firewalls (WAF) in front of AEM should be configured to detect and block XSS payloads in POST/PUT requests to form endpoints. Implement Content Security Policy (CSP) headers to mitigate execution of injected scripts even if payloads persist.

Why prioritize this

Although rated MEDIUM severity, this vulnerability warrants near-term patching due to low attack complexity, low barrier to entry, and high likelihood of exploitation in multi-user content management environments. Stored XSS affecting form fields is particularly dangerous because payloads affect multiple victims passively. Any organization where authors lack full trust or whose systems lack strong administrative access controls should treat this as elevated priority. The scope change aspect indicates wider impact beyond the immediate component.

Risk score, explained

The CVSS 3.1 score of 5.4 MEDIUM reflects the vulnerability's requirement for authenticated access, user interaction, and moderate impact (confidentiality and integrity, no availability loss). However, the actual organizational risk may be higher depending on the sensitivity of data handled by AEM, the number of end users consuming the content, and the level of administrative oversight of form creation. Organizations with customer-facing AEM deployments or handling personal/financial data should treat this above the MEDIUM baseline.

Frequently asked questions