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Adobe Experience Manager CVE-2025-64593

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
    Payload stored server-side
  4. Execution
    Victim browses affected page
  5. Persist
    Script executes in victim browser
  6. Impact
    Session hijack or data theft

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 a low-privileged authenticated AEM account (PR:L) with the ability to write content into a vulnerable form field, plus a subsequent victim who browses to the page rendering that stored field (UI:R) - the payload does not fire until a user views the affected page. This is a stored/persistent XSS, so it affects AEM form-authoring workflows where untrusted or lower-tier authors can submit field content; it is not remote-unauthenticated. Limiting factors: the required authenticated write access, the dependency on victim interaction, and applicability to the specific vulnerable form-field feature rather than arbitrary default pages. Affected: AEM 6.5.23 and earlier, AEM Cloud Service, and AEM 6.5 LTS per the provided CPEs.

Impact

This is a moderate-severity stored XSS (CVSS 5.4, CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) whose real-world urgency signals all point to low priority rather than emergency patching. The attack vector is network-reachable with low complexity, but exploitation requires a low-privileged authenticated account (PR:L) AND victim interaction (UI:R), both of which meaningfully constrain opportunistic exploitation. The scope change (S:C) and dual C:L/I:L impacts are consistent with script execution crossing from the injected form field into a victim's browser/session context. Corroborating the low-urgency reading: EPSS is 0.20% (10th percentile), there is no CISA KEV listing, and no public exploit code was provided in the input. No SSVC decision data was supplied. In short, the signals are internally consistent - a genuine but low-to-moderate risk flaw gated by authentication and user interaction, not a high-CVSS-but-overrated issue nor an actively-exploited emergency. No conflicting signals were found; the main caveat is simply that absence of POC/KEV data does not guarantee no exploit exists, only that none was reported here.

Exploit ScenarioDerived

A low-privileged user (e.g., a content author or form editor) injects malicious JavaScript into a vulnerable AEM form field, which is stored by the application. When a victim - such as another author or an end user - later browses to the page rendering that field, the script executes in their browser under the application's origin, enabling session/cookie theft or actions in the victim's authenticated context. 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 14, 2026

Stored cross-site scripting in Adobe Experience Manager 6.5.23 and earlier, AEM Cloud Service, and AEM 6.5 LTS lets a low-privileged authenticated author inject malicious JavaScript into vulnerable form fields, which then executes in the browser of a user who visits the affected page. Because exploitation requires a low-privileged account with write access plus a victim's interaction (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N, score 5.4), and because EPSS is only 0.20% at the 10th percentile with no public exploit identified at time of analysis, this is a moderate-priority stored XSS rather than an emergency remote code execution issue.

RemediationAI

Apply the fixed release identified in Adobe advisory APSB25-115 for AEM 6.5, AEM Cloud Service, or AEM 6.5 LTS; the input does not provide an exact patched version number, so consult the advisory rather than inferring one. Until patching is possible, restrict content-authoring privileges so only trusted roles can write to form fields, and remove or disable the vulnerable form-field component if it is not business-critical. Enforce a Content Security Policy that blocks inline and untrusted script execution (for example script-src with nonces or strict-dynamic) and sanitize or encode all stored form-field input on output; these controls reduce XSS execution but CSP tuning can break legitimate AEM authoring UI scripts. Deploy WAF rules targeting stored XSS payloads in AEM form submissions as a temporary layer, but expect false positives on legitimate rich content. Monitor for low-privileged authors injecting script tags into form fields and review pages that render untrusted stored content.

Affects your stack

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

Technical ContextAI · show details

The issue is CWE-79, improper neutralization of input during web page generation, in Adobe Experience Manager, a Java-based content management system. The affected CPEs cover Adobe Experience Manager releases in the wildcard, aem_cloud_service, and 6.5 lts channels, aligning with AEM 6.5.23 and earlier plus AEM Cloud Service and AEM 6.5 LTS. A low-privileged authenticated user with content-write capability can store crafted HTML/JavaScript in a vulnerable form field; the payload is persisted server-side and rendered without adequate encoding, so JavaScript executes in a victim's browser when that page is viewed. This is not remote-unauthenticated exploitation, and it depends on the specific form-field authoring/rendering path rather than arbitrary default AEM pages. The provided vector (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) matches an authenticated, user-interaction-dependent stored XSS with changed scope, limited confidentiality/integrity impact, and no availability impact. No KEV listing, public exploit, or PoC is included in the input, and the EPSS score is 0.20% (10th percentile).

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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

Stored XSS reachable over the network but requiring a low-privileged author account (PR:L) and victim browsing (UI:R); script crosses into the victim browser (S:C) with limited C/I and no availability 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:N/VI:N/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 90% exploitable
Prevalence
High
widely deployed enterprise CMS 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
High

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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