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Adobe Experience Manager CVE-2025-64858

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-priv AEM user
  2. Delivery
    Inject script into vulnerable form field
  3. Exploit
    Payload stored in AEM
  4. Execution
    Victim browses affected page
  5. Impact
    Malicious JS 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 a valid low-privileged authenticated AEM account with access to submit content into the vulnerable form fields (PR:L), plus victim interaction (UI:R) - a separate user must browse to the page rendering the injected field for the stored script to execute. Affects Adobe Experience Manager 6.5.23 and earlier, including AEM Cloud Service and the 6.5 LTS build. Exploitation is limited by the need for both attacker authentication and victim navigation; there is no unauthenticated or fully automated path.

Impact

This is a genuine but low-priority issue. 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 internally consistent with the description: a low-privileged authenticated attacker (PR:L) injects script into form fields that later executes in another user's browser (UI:R, S:C for the browser-context crossing, C:L/I:L for limited stored-XSS impact). Exploitation is double-gated by both a valid low-priv AEM account AND victim interaction (browsing to the affected page). Threat-intel signals reinforce low real-world urgency: EPSS is only 0.20% (9th percentile), there is no CISA KEV listing, and no public POC has been identified. All signals align - there is no conflict between the CVSS vector, EPSS, and KEV status. This is a real-but-modest defense-in-depth fix rather than an emergency, though AEM's enterprise footprint warrants routine patching per Adobe APSB25-115.

Exploit ScenarioDerived

A low-privileged AEM author account holder injects a malicious JavaScript payload into a vulnerable form field. The stored script is persisted and later executes in the browser of a higher-privileged user or other victim who navigates to the page containing that field, enabling limited session/data theft in the victim's browser 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 in Adobe Experience Manager 6.5.23 and earlier (including AEM as a Cloud Service and the 6.5 LTS line) lets a low-privileged authenticated author inject malicious JavaScript into vulnerable form fields, which then executes in the browser of any user who later browses the page rendering that field. Exploitation requires a valid low-privileged AEM account plus victim interaction (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N, base 5.4), so there is no unauthenticated or fully automated attack path; assessed impact is limited confidentiality and integrity loss within the victim's session. EPSS is low at 0.20% (9th percentile), the issue is not listed in CISA KEV, and no public exploit code has been identified at time of analysis.

RemediationAI

Upgrade Adobe Experience Manager to the patched release identified in Adobe's advisory APSB25-115 (https://helpx.adobe.com/security/products/experience-manager/apsb25-115.html), which is the authoritative source for the exact fixed AEM 6.5.x/LTS and Cloud Service versions; the specific patched version number was not present in the provided data, so confirm it directly against that bulletin before scheduling the change. Where immediate upgrade is not possible, compensating controls are: restrict content-authoring and form-submission privileges so that only trusted, vetted accounts (rather than any low-privileged author) can write to AEM form fields - this reduces the attacker population but does not remove the injection sink; deploy a strict Content-Security-Policy on AEM author and publish tiers to block inline script execution, accepting that poorly configured or legacy components may break; sanitize and re-validate stored form-field content (server-side output encoding on render) as an interim hardening measure, with the caveat that custom AEM components may bypass default protections and require separate review; and monitor author/publish logs for anomalous form submissions containing script-like payloads, which provides detection but not prevention. Note that because the issue is stored XSS, cleaning up already-injected content after patching is necessary to fully close the exposure.

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 root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation), specifically the stored/persistent variant: user-supplied content is written into an AEM form field and persisted server-side, then rendered back into a page without adequate output encoding or sanitization. Because the payload is stored rather than reflected, a single successful injection can affect every user who views the affected page, which is why the CVSS vector scores scope as Changed (S:C) - the script executes in the context of the victim's browser session and origin rather than the attacker's. The vector PR:L confirms the attacker must hold an authenticated, low-privileged AEM account capable of submitting content into the vulnerable form fields, while UI:R confirms a separate victim must navigate to the poisoned page for the script to fire. CPE data maps the affected surface to Adobe Experience Manager generally (cpe:2.3:a:adobe:experience_manager:*:*:*:*:-), the AEM Cloud Service edition (aem_cloud_service), and the 6.5 LTS build channel, indicating the vulnerable form-field handling is shared across the 6.5.x on-premise/LTS and cloud deployment models rather than being specific to a single edition.

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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 web CMS with low-priv author account (PR:L) storing script that runs in a victim's browser (UI:R, S:C), with limited confidentiality/integrity 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: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
Medium
Widely used enterprise CMS but deployed in a specific vendor segment, not everywhere
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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