Security readout for executives and security teams
Plain-English summary
This AEM issue lets an unauthenticated attacker create content nodes in a restricted user-generated location. Adobe describes the business impact as potential application denial-of-service. The public record rates it low severity, with high attack complexity and no listed CISA KEV status.
Executive priority
Handle through normal vulnerability management unless AEM is internet-facing, business-critical, or already showing unexplained repository growth or service instability. The urgency is lower than exploited or critical AEM flaws, but affected systems should still be confirmed and updated.
Technical view
CVE-2021-28626 is an improper authorization flaw in Adobe Experience Manager at /content/usergenerated. AEM Cloud Service and AEM 6.5.8.0 and below are listed as affected. The CVSS 3.1 score is 3.7, network reachable, high complexity, no privileges, no user interaction, and low integrity impact.
Likely exposure
Exposure is most likely for organizations running Adobe Experience Manager Cloud Service or AEM 6.5.8.0 and earlier. Publicly reachable AEM environments deserve inventory review. The source bundle does not provide CPEs, precise deployment conditions, or fixed-version details.
Exploitation context
The sources state unauthenticated exploitation is possible and does not require user interaction, but attack complexity is high. No provided source states active exploitation, and the CVE is not marked CISA KEV. Treat exploitation evidence as unconfirmed.
Researcher notes
The public details are limited. The CVE identifies the authorization boundary and affected AEM families, but not exact fixed builds, exploit prerequisites beyond high complexity, or reliable indicators of compromise. Avoid assuming broader Adobe product impact.
Mitigation direction
- Review Adobe APSB21-39 and apply the vendor-recommended AEM security update path.
- Confirm Adobe-managed Cloud Service environments received the relevant security maintenance.
- Prioritize internet-facing AEM instances running 6.5.8.0 or earlier for remediation review.
- Monitor AEM storage and content growth for abnormal user-generated node creation.
Validation and detection
- Inventory all AEM Cloud Service and AEM 6.5 deployments.
- Confirm whether any on-premises AEM instance is version 6.5.8.0 or earlier.
- Check Adobe advisory applicability against each deployment model.
- Review AEM and edge logs for anomalous /content/usergenerated activity.
- Verify operational monitoring would detect abnormal repository growth or application degradation.
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-285: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2021-28626 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
- Low
- CVSS
- 3.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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:H/PR:N/UI:N/S:U/C:N/I:L/A:N2.21.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.7LowVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
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 Authorization
Improper Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.