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Adobe Experience Manager CVE-2025-64793

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
    Authenticate as low-privileged AEM user
  2. Delivery
    Inject script into vulnerable form field
  3. Exploit
    Payload stored in repository
  4. Execution
    Victim browses to affected page
  5. Persist
    Script executes in victim browser
  6. Impact
    Session/credential theft in AEM context

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

Requires an authenticated account with at least low-privilege content-authoring access to AEM in order to submit input into the affected form field (PR:L). Exploitation also requires victim user interaction (UI:R): a second user must browse to the page that renders the stored malicious field for the script to execute - the attacker cannot trigger execution on demand. Affected deployments are Adobe Experience Manager 6.5.23 and earlier, including AEM Cloud Service and the AEM 6.5 LTS build. This is not a default-config unauthenticated remote flaw; the dual authentication + interaction requirement materially limits realistic exploitation.

Impact

This is a genuine-but-low-priority issue: a high-footprint enterprise product with a modest vulnerability. All signals align toward LOW real-world urgency. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N = 5.4 Medium) is doubly gated - it requires both low-privileged authentication (PR:L) AND victim user interaction (UI:R, the victim must browse to the page holding the injected field). Impact is limited to C:L/I:L with no availability effect, consistent with a stored XSS that runs script in a single victim's browser session rather than compromising the server. EPSS reinforces this: 0.25% probability at only the 15th percentile indicates very low predicted exploitation likelihood. There is NO CISA KEV listing and NO public POC identified. The scope-change flag (S:C) is the standard XSS convention (script escapes the app's security boundary into the browser context) and does not imply server-side or cross-tenant compromise. No signals conflict - CVSS, EPSS, and the absence of KEV/POC all point the same direction. This is a routine-patch item, not an emergency.

Exploit ScenarioDerived

A low-privileged authenticated AEM user (e.g. a content author) injects malicious JavaScript into a vulnerable form field that AEM stores without proper output encoding. When another user - such as an administrator or another author - later browses to the page rendering that field, the script executes in their browser under the AEM origin, enabling session-token theft or actions on their behalf. No public exploit code is identified at time of analysis, and successful attack requires the victim to actually navigate to the affected page.

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 – Sep 26, 2026

Stored cross-site scripting (XSS) in Adobe Experience Manager (AEM) 6.5.23 and earlier allows an authenticated attacker with low-privilege content-authoring access to inject malicious JavaScript into form fields, which executes in a victim's browser when they view the affected page. Exploitation requires the victim to interact with the crafted page (UI:R) and the attacker to have a valid low-privileged account (PR:L), so it is not unauthenticated or remote-exploitable without credentials. No public exploit code has been identified at time of analysis, and EPSS is low at 0.25%, making this a genuine but low-priority issue for most deployments.

RemediationAI

Apply the fix per Adobe Security Bulletin APSB25-115 - consult the advisory for the exact patched version, which likely involves upgrading to a later AEM 6.5 service pack or applying a hotfix. Until patching is possible, restrict content-authoring privileges to trusted users only, as exploitation requires a low-privileged authenticated account. Enforce strict input validation and output encoding on all form fields, and consider a web application firewall (WAF) rule to block XSS payloads in form submissions, though WAFs may cause false positives and require tuning. Because victim interaction is required, educate users about the risks of clicking suspicious links or interacting with untrusted content. These compensating controls reduce risk but do not eliminate the vulnerability, and restricting authoring access may impact legitimate content workflows.

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

The vulnerability is a stored cross-site scripting (XSS) flaw (CWE-79) in Adobe Experience Manager, a content management system for building websites and digital experiences. An attacker with low-privilege authoring access can submit malicious script code into a form field that is stored in the AEM content repository (PR:L). When another user later browses to the page that renders the vulnerable field, the script executes in their browser context (UI:R). The CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N indicates network attack vector, low complexity, low privileges required, user interaction required, changed scope, and low confidentiality and integrity impact, with no availability impact. Affected CPEs include adobe:experience_manager for all versions up to 6.5.23, the adobe:experience_manager aem_cloud_service edition, and the 6.5 LTS build. The root cause is insufficient input neutralization or output encoding of user-supplied content before it is stored and later rendered in a web page.

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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

Network-reachable stored XSS needing low-priv authoring access (PR:L) and victim page visit (UI:R); script escapes to browser context (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:L/VI:L/VA:N/SC:N/SI:N/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 85% exploitable
Prevalence
Medium
widely-used enterprise CMS but niche vs ubiquitous web infrastructure
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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