Security readout for executives and security teams
Plain-English summary
Adobe Experience Manager Forms had a stored cross-site scripting flaw. A user with Author privileges could save malicious script content in Forms fields, and that script could run in another user’s browser when they opened the affected page.
Executive priority
Treat this as urgent for affected AEM Forms deployments because stored XSS can compromise users who view trusted pages. Prioritize remediation where Author access is broad or authoring content is exposed to privileged users.
Technical view
CVE-2020-9734 affects the AEM Forms add-on in versions 6.5.5.0 and below, and 6.4.8.1 and below. It is CWE-79 stored XSS with CVSS 3.1 score 9.0. The vector requires network access, low complexity, low privileges, and user interaction, with changed scope and high impact ratings.
Likely exposure
Exposure is most likely on Adobe Experience Manager deployments using the AEM Forms add-on at the affected versions, especially where non-administrative Author accounts can edit Forms component fields.
Exploitation context
The provided sources do not show known active exploitation, and the CVE is not marked KEV. Exploitation requires an Author-privileged user to store malicious content and a victim to open the page containing the vulnerable field.
Researcher notes
The source bundle identifies affected version thresholds and vulnerability mechanics, but does not include exact fixed versions or exploit evidence. Avoid assuming public exploitation. Focus validation on AEM Forms component field handling, Author privilege boundaries, and vendor advisory alignment.
Mitigation direction
- Identify all Adobe Experience Manager instances using the AEM Forms add-on.
- Check whether versions are 6.5.5.0 or below, or 6.4.8.1 or below.
- Review Adobe APSB20-56 for vendor-provided fixed versions and upgrade instructions.
- Restrict Author privileges to trusted users until remediation is complete.
- Review editable Forms fields for suspicious stored script content.
Validation and detection
- Inventory AEM Forms add-on versions across production and authoring environments.
- Confirm whether vulnerable Forms components are present on accessible pages.
- Review Author account activity for unexpected Forms component edits.
- Verify remediation against Adobe APSB20-56 guidance.
- Retest affected pages after patching or mitigation.
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-2020-9734 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
- Critical
- CVSS
- 9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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:L/UI:R/S:C/C:H/I:H/A:H2.36Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9CriticalVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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.