Security readout for executives and security teams
Plain-English summary
Adobe Experience Manager had an XSS flaw where malicious script could be placed into vulnerable form fields and run in another user’s browser when they viewed the affected page. Business risk is moderate: it can affect confidentiality, integrity, and availability at low impact levels, but it requires user interaction.
Executive priority
Treat as a moderate-priority web application issue. It is not confirmed actively exploited in the supplied sources, but affected AEM environments should be patched because XSS can expose user sessions and trusted application actions.
Technical view
CVE-2021-28628 is CWE-79 cross-site scripting in Adobe Experience Manager inbox render.jsp. The CVSS 3.1 score is 6.3 with network attack vector, low complexity, no privileges required, and user interaction required. Affected scope includes AEM Cloud Service and AEM 6.5.8.0 and below.
Likely exposure
Organizations using Adobe Experience Manager Cloud Service or AEM 6.5.8.0 and below should assume possible exposure until version and vendor-remediation status are confirmed.
Exploitation context
The supplied sources do not show KEV listing or active exploitation. Exploitation requires a victim to browse to a page containing the vulnerable field after malicious script has been introduced.
Researcher notes
Evidence identifies inbox render.jsp and vulnerable form fields, but the bundle does not include exploit details or a specific fixed version. Use Adobe’s advisory as the authoritative remediation source and avoid assuming exploitability beyond the CVSS and description.
Mitigation direction
- Review Adobe APSB21-39 and apply the vendor-recommended AEM remediation.
- Confirm whether AEM Cloud Service tenants received Adobe-managed fixes.
- Prioritize remediation for internet-accessible or broadly used AEM authoring environments.
- Restrict access to affected AEM interfaces where business operations allow.
Validation and detection
- Inventory all Adobe Experience Manager deployments and record exact versions.
- Check for AEM 6.5.8.0 or below in server and package metadata.
- Review Adobe APSB21-39 against each deployment’s current patch state.
- Test affected inbox workflows for script execution only in an authorized environment.
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-2021-28628 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
- 6.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
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:U/C:L/I:L/A:L2.83.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://helpx.adobe.com/security/products/experience-manager/apsb21-39.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.