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Adobe Experience Manager CVE-2025-64559

MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2025-12-10 psirt@adobe.com
5.4
CVSS 3.1 · Vendor: adobe
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Obtain low-privileged AEM account
  2. Delivery
    Inject script into vulnerable form field
  3. Exploit
    Victim browses affected page
  4. Execution
    Stored JavaScript executes in victim browser
  5. Impact
    Hijack session or act as victim

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires an authenticated low-privileged account in Adobe Experience Manager with the ability to edit form fields (per PR:L), and it is stored/persistent XSS triggered only when a victim subsequently browses to the page containing the injected field (UI:R). Limiting factors: the attacker must already hold authoring/form-edit privileges, a separate victim must navigate to the affected content for the payload to fire, and impact is confined to the victim's browser session (Low C/I, no availability impact). This makes it most relevant in multi-user AEM authoring/collaboration deployments rather than against anonymous public visitors.

Impact

This is a moderate-severity stored XSS (CVSS 5.4) whose signals consistently point to a genuine but non-urgent issue. The CVSS vector (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) requires a low-privileged authenticated attacker and victim user interaction (browsing to the affected page), with only Low confidentiality and integrity impact and a changed scope reflecting script execution in the victim's browser context. EPSS is low at 0.20% (9th percentile), the CVE is NOT on CISA KEV, and no public exploit code was identified - all three low-urgency signals agree, so there is no evidence of active or imminent widespread exploitation. No SSVC decision data was supplied. The signals are mutually consistent (authenticated + user-interaction + low EPSS + no KEV/POC), so this is a real-but-low-priority finding rather than a high-CVSS/low-real-risk mismatch; prioritize behind unauthenticated or KEV-listed flaws but patch in normal cycles, especially for multi-author AEM authoring environments where a low-privileged content contributor could target higher-privileged reviewers.

Exploit ScenarioDerived

A low-privileged AEM author or form editor injects malicious JavaScript into a vulnerable form field. When another user - such as a content reviewer or administrator - browses to the page containing that field, the script executes in their authenticated browser session, enabling session/token theft or actions on their behalf. No public exploit code was identified at time of analysis.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 08, 2026

Stored cross-site scripting in Adobe Experience Manager 6.5.23 and earlier allows a low-privileged authenticated attacker to inject malicious JavaScript into vulnerable form fields, with the payload executing in another user's browser when they browse to the affected page. The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N (5.4), and EPSS is 0.20% (9th percentile), indicating low predicted exploitation activity. No CISA KEV entry was provided, and no public exploit identified at time of analysis, making this a genuine but non-urgent moderate-severity issue.

RemediationAI

Apply the Adobe Experience Manager fix referenced in Adobe Security Advisory APSB25-115 (https://helpx.adobe.com/security/products/experience-manager/apsb25-115.html); the supplied data does not include an exact fixed version, so use the advisory to identify the patched 6.5 build for AEM 6.5.23 and earlier and upgrade to it, as Patch available per vendor advisory. If immediate upgrade is not possible, reduce the attack surface by restricting form-authoring and content-edit privileges to trusted users, reviewing and sanitizing existing form-field content, and enforcing a strict Content Security Policy (CSP) with script-src limitations to reduce script execution; note that a strict CSP may break legitimate AEM authoring components and should be tested. Additional compensating controls include monitoring for unexpected form-field content changes and setting session cookies with HttpOnly and SameSite attributes to limit the impact of script execution, though these do not eliminate the XSS flaw itself.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Adobe Experience Manager (AEM) is an enterprise Java-based content management and digital asset management platform. The flaw is a stored/persistent cross-site scripting issue in CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), meaning user-controllable form-field content is persisted and later rendered without adequate output encoding or sanitization. The provided CPE data identifies affected AEM 6.5 LTS installations (cpe:2.3:a:adobe:experience_manager:6.5:-:*:*:lts:*:*:*), generic AEM 6.5.x and earlier branches (cpe:2.3:a:adobe:experience_manager:*:*:*:*:-:*:*:*), and an AEM Cloud Service CPE (cpe:2.3:a:adobe:experience_manager:*:*:*:*:aem_cloud_service:*:*:*). Exploitation requires an authenticated account able to edit form fields (PR:L), and the script fires only when a separate victim views the poisoned page (UI:R); because the vulnerability can affect resources beyond the attacker's origin, the CVSS scope is Changed (S:C). Impact is limited to low confidentiality and integrity effects in the victim's browser session, with no availability impact.

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Severity by source

Vendor (adobe) PRIMARY 5.4 MEDIUM
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
vuln.today AI 5.4 MEDIUM

Authenticated low-privileged author injects the payload (PR:L), a victim must load the page (UI:R), and execution in the victim's browser crosses a trust boundary (S:C) with limited C/I impact.

3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (adobe).

CVSS VectorVendor: adobe

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

DescriptionCVE.org

Adobe Experience Manager versions 6.5.23 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.

Threat Intelligence Overview

EPSS Score
0.2%
Top 91% exploitable
Prevalence
High
widely-deployed enterprise CMS/digital experience platform across large organizations
Data Quality
3 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

27
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +27
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

Affected Products (CPE)CVE.org

cpe:2.3:a:adobe:experience_manager:*:*:*:*:-:*:*:*
cpe:2.3:a:adobe:experience_manager:*:*:*:*:aem_cloud_service:*:*:*
cpe:2.3:a:adobe:experience_manager:6.5:-:*:*:lts:*:*:*
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