CVE-2021-40714Network attack vector

Reflected XSS via unneutralized accesskey parameter

Published Sep 27, 2021 · Updated Apr 23, 2025

Reflected XSS in Adobe Experience Manager 6.5.9.0 and earlier allows remote attackers to execute JavaScript through a crafted URL. A vulnerable page reflects the accesskey parameter without neutralizing script-capable input, causing the browser to run supplied code in the page's origin. Exploitation requires a victim to follow the attacker-supplied URL and exposes page data or actions available to that victim; no service interruption is reported.

CVSS severity6.1
Medium
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Adobe Experience Manager 6.5.9.0 and earlier allows remote attackers to execute JavaScript through a crafted URL. A vulnerable page reflects the accesskey parameter without neutralizing script-capable input, causing the browser to run supplied code in the page's origin. Exploitation requires a victim to follow the attacker-supplied URL and exposes page data or actions available to that victim; no service interruption is reported.

The record

CVE
CVE-2021-40714
Published
Sep 27, 2021
Updated
Apr 23, 2025
Vendor
Adobe
Product
Adobe Experience Manager
Classifications
CWE-79, T1204.001, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=6.5.9.0
  2. Affected versionversion=unspecified <=None

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Adobe · Adobe Experience Managerversion=unspecified <=6.5.9.0; version=unspecified <=None

Published CVSS scores

6.1Adobe Systems IncorporatedCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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