Security readout for executives and security teams
Plain-English summary
Adobe Experience Manager 6.5.9.0 and earlier has a reflected XSS flaw. A victim who opens a crafted link to a vulnerable page could run attacker-supplied JavaScript in their browser. This can expose limited data or alter browser-side actions, but it requires user interaction.
Executive priority
Treat this as a moderate web application risk. It is not reported as actively exploited in the provided sources, but public AEM sites should be patched because successful phishing could run script in trusted site context.
Technical view
CVE-2021-40714 is CWE-79 reflected cross-site scripting through the accesskey parameter in Adobe Experience Manager. CVSS 3.1 is 6.1: network reachable, low complexity, no privileges required, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is most likely where Adobe Experience Manager 6.5.9.0 or earlier serves reachable pages that process the accesskey parameter. Public-facing AEM sites raise phishing and session-context risk, while internal-only deployments reduce reach but still matter for targeted users.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. Exploitation depends on convincing a user to visit a malicious URL referencing a vulnerable page, so phishing or social engineering is the practical trigger.
Researcher notes
Evidence is limited to the CVE record and Adobe bulletin reference. The bundle identifies the affected product, version ceiling, parameter, weakness class, and CVSS vector, but does not include exploit details, proof of active exploitation, or a specific fixed version.
Mitigation direction
- Inventory Adobe Experience Manager instances and identify versions 6.5.9.0 or earlier.
- Review Adobe APSB21-82 for the vendor-approved fix or upgrade path.
- Prioritize remediation for public-facing AEM author or publish environments.
- Use vendor guidance rather than ad hoc parameter filtering as the primary fix.
- Monitor for suspicious links targeting AEM pages until remediation is complete.
Validation and detection
- Confirm each AEM instance version against the affected range.
- Review scanner findings for reflected XSS tied to the accesskey parameter.
- After applying Adobe guidance, retest affected pages without using weaponized payloads.
- Check that public AEM endpoints no longer expose the vulnerable behavior.
- Document fixed versions and remaining exceptions in vulnerability tracking.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-40714 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://helpx.adobe.com/security/products/experience-manager/apsb21-82.htmlCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.