Analyst readout for executives and security teams
Plain-English summary
This is a stored cross-site scripting issue in Adobe Experience Manager. A highly privileged user with access to the Content Repository Development Environment could save script content into certain repository node fields. If another user later views search results containing that field, the script may run in their browser.
Executive priority
Prioritize remediation for internet-facing or business-critical AEM authoring environments, especially where many users have repository development access. This is not evidenced as actively exploited in the bundle, but stored XSS in a CMS can affect privileged sessions and content integrity.
Technical view
CVE-2020-9735 affects AEM 6.5.5.0 and below, 6.4.8.1 and below, 6.3.3.8 and below, and 6.2 SP1-CFP20 and below. The weakness is CWE-79 stored XSS, network reachable, low complexity, high privileges required, and user interaction required. CVSS v3.1 score is 6.8.
Likely exposure
Exposure is most likely where Adobe Experience Manager includes older affected versions and grants users access to the Content Repository Development Environment. The privilege requirement lowers broad internet risk, but impact can be serious if administrators or content managers view poisoned search results.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. The described attack requires prior high-privilege access to store malicious content and a victim interaction path through search results. Treat it as an insider, compromised-admin, or weakly governed AEM authoring risk.
Researcher notes
The public bundle identifies affected version thresholds, CWE-79, CVSS vector, and the Adobe bulletin reference. It does not include detailed vulnerable field names, proof-of-concept material, or explicit exploit activity. Validation should focus on version exposure, access control, and vendor-advised remediation status.
Mitigation direction
- Inventory Adobe Experience Manager instances and record exact 6.2, 6.3, 6.4, and 6.5 patch levels.
- Apply Adobe APSB20-56 guidance; upgrade affected AEM branches to vendor-supported fixed levels.
- Restrict Content Repository Development Environment access to trusted administrative users only.
- Review repository node fields for suspicious script content where development environment access existed.
Validation and detection
- Confirm whether any instance is AEM 6.5.5.0 or below.
- Confirm whether any instance is AEM 6.4.8.1, 6.3.3.8, or 6.2 SP1-CFP20 or below.
- Verify Content Repository Development Environment access is limited and auditable.
- Check whether search result pages render repository field content safely after remediation.
Public sources used
Based on public source material and reviewed before publication.
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-2020-9735 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
- 6.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
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:H/UI:R/S:U/C:H/I:H/A:H0.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.8MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://helpx.adobe.com/security/products/experience-manager/apsb20-56.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.