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Adobe Experience Manager CVE-2025-64826

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 AEM
  4. Execution
    Victim browses affected page
  5. Impact
    Script executes in victim browser

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 low-privileged AEM account (PR:L) with the ability to submit or edit content in a vulnerable form field, and a victim who subsequently browses to the page rendering that field (UI:R). Exploitation is limited by the need for prior authentication, the specific vulnerable form components, and victim interaction; it does not work against unauthenticated attackers or without a victim viewing the injected content. Affects AEM on-prem/Managed Services 6.5.23 and earlier, AEM Cloud Service, and AEM 6.5 LTS.

Impact

This is a classic high-CVSS-context-but-low-real-risk issue: the CVSS 3.1 base score is only 5.4 (MEDIUM) and every real-world signal confirms low priority. The vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N is doubly gated - it requires an already-authenticated low-privileged account (PR:L) to plant the payload AND a victim to browse the affected page (UI:R). Impact is limited to C:L/I:L with A:N, consistent with a stored XSS that runs script in a victim browser rather than compromising the server. EPSS is 0.25% (15th percentile), indicating low predicted exploitation likelihood. There is no CISA KEV listing and no public POC identified. No SSVC decision data was provided. All signals agree: no active exploitation, low automatability (requires authenticated injection plus victim interaction), and low technical impact. Priority is LOW despite AEM being enterprise software - patch during normal cycle via APSB25-115.

Exploit ScenarioDerived

A low-privileged authenticated AEM user (e.g., a content author or form editor) injects malicious JavaScript into a vulnerable form field that is stored server-side. When a higher-privileged user or another visitor later browses to the page rendering that field, the script executes in their browser, potentially stealing session cookies or performing actions in their context. No public exploit code has been 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 – Sep 26, 2026

Stored cross-site scripting (XSS) in Adobe Experience Manager (AEM) versions 6.5.23 and earlier, including AEM Cloud Service and AEM 6.5 LTS, allows a low-privileged authenticated attacker to inject malicious JavaScript into vulnerable form fields, which executes in a victim's browser when they view the affected page. Exploitation requires the attacker to have a valid low-privileged AEM account and the victim to interact with the compromised page, limiting real-world risk. The EPSS score is 0.25% (15th percentile) and no public exploit has been identified at time of analysis.

RemediationAI

Apply the security update provided by Adobe in advisory apsb25-115 (https://helpx.adobe.com/security/products/experience-manager/apsb25-115.html); the advisory specifies the exact patched version, which was not included in the input data. Until patching, restrict the ability to submit or edit form content to trusted users only, as the vulnerability requires a low-privileged authenticated account. Implement strict input validation and context-aware output encoding for all form fields to neutralize stored scripts. Deploy a Content Security Policy (CSP) that disallows inline script execution, but note this may break legitimate AEM functionality and requires careful testing. Additionally, regularly audit stored form content for suspicious scripts, and monitor for unusual user activity.

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 (persistent) cross-site scripting issue (CWE-79) in Adobe Experience Manager's form components. AEM is a content management system for building websites, forms, and digital experiences. The flaw arises because user-supplied input into certain form fields is not properly neutralized before being stored and later rendered in a web page. An authenticated attacker with low privileges (PR:L) can submit crafted content that includes JavaScript, which is then saved server-side and executed in the browser of any user who visits the page containing the field (UI:R). The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N, indicating network attack, low complexity, but requiring authentication and user interaction; the scope is changed (S:C) and impact is limited to low confidentiality and integrity. Affected CPEs include adobe:experience_manager for on-premise/Managed Services 6.5, AEM Cloud Service, and AEM 6.5 LTS.

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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 a low-priv authenticated injector (PR:L) and victim browsing (UI:R); scope change (S:C) as script runs in victim browser, low C/I impact, no availability effect.

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 85% exploitable
Prevalence
Medium
widely-used enterprise CMS but not on every network
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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