Security readout for executives and security teams
Plain-English summary
CVE-2021-21030 is a high-severity stored cross-site scripting issue in Magento Commerce. A malicious value uploaded through the customer address feature could later run JavaScript in another user's browser. The business risk is account, session, or data exposure if a trusted user interacts with poisoned content.
Executive priority
Prioritize remediation for affected production commerce sites because stored XSS can compromise customer or staff browser sessions after interaction. Address it in the normal urgent patch cycle unless local evidence shows exposure is absent or the affected feature is disabled.
Technical view
Magento Commerce 2.4.1 and earlier, 2.4.0-p1 and earlier, and 2.3.6 and earlier are affected. The weakness is CWE-79 stored XSS in the customer address upload feature. CVSS is 8.1: network reachable, low complexity, no privileges required, user interaction required, with high confidentiality and integrity impact.
Likely exposure
Exposure is most likely on internet-facing Magento Commerce stores using affected versions and exposing customer address upload workflows. The source bundle does not identify Magento Open Source, cloud variants, plugins, or other products as affected for this CVE.
Exploitation context
The CVE states exploitation requires user interaction. The bundle does not cite CISA KEV listing, active exploitation, public exploit availability, or observed attacks. Treat it as important due to stored execution and high confidentiality and integrity impact, not because exploitation is confirmed.
Researcher notes
Evidence is limited to the CVE record and Adobe advisory reference. Do not assume affected extensions, exploit chains, or active exploitation from this bundle. Validation should focus on version inventory, feature exposure, stored input review, and confirmation against Adobe APSB21-08.
Mitigation direction
- Inventory Magento Commerce deployments and confirm exact version numbers.
- Review Adobe APSB21-08 and apply vendor-supported fixes or mitigations.
- Prioritize affected public stores and administrative workflows handling customer address uploads.
- Temporarily reduce access to exposed upload workflows where business operations allow.
- Monitor for suspicious stored content or unexpected browser script behavior.
Validation and detection
- Compare deployed versions against 2.4.1, 2.4.0-p1, and 2.3.6 affected ranges.
- Confirm whether customer address upload functionality is enabled or externally reachable.
- Review application records and logs for suspicious address upload content.
- After remediation, verify the vendor advisory no longer lists the deployed version as affected.
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-2021-21030 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
- High
- CVSS
- 8.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N2.85.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.1HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://helpx.adobe.com/security/products/magento/apsb21-08.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.