Security readout for executives and security teams
Plain-English summary
This is a reflected cross-site scripting issue in ACS Commons compare tools used with Adobe Experience Manager. A victim must interact with a crafted page or input before malicious JavaScript can run in their browser. Business impact is mainly account/session risk and trust damage, not server takeover.
Executive priority
Treat as a moderate web application risk. Prioritize remediation for internet-accessible or broadly used AEM authoring environments, especially where privileged users may receive external links.
Technical view
ACS Commons 4.9.2 and earlier mishandles invalid JCR characters in the version-compare and page-compare tools, enabling reflected XSS in vulnerable form fields. CVSS is 6.1 with network access, low attack complexity, no privileges required, and required user interaction.
Likely exposure
Exposure is most likely in Adobe Experience Manager environments that use ACS Commons 4.9.2 or earlier and allow users to access version-compare or page-compare functionality.
Exploitation context
The provided sources do not show known active exploitation or CISA KEV listing. Exploitation requires user interaction, so phishing or socially engineered links are the most plausible path.
Researcher notes
Evidence identifies CWE-79 reflected XSS and vulnerable ACS Commons 4.9.2 and earlier. The bundle does not provide exploit details, observed exploitation, or a specific fixed version; consult the advisory before closing remediation.
Mitigation direction
- Identify AEM deployments using ACS Commons 4.9.2 or earlier.
- Check the ACS Commons GitHub advisory for fixed release guidance.
- Upgrade or apply vendor-recommended remediation when confirmed.
- Restrict access to compare tools until remediation is complete.
- Monitor reports of suspicious JavaScript execution in authoring sessions.
Validation and detection
- Inventory ACS Commons package versions across AEM environments.
- Confirm whether version-compare and page-compare tools are present and reachable.
- Review access controls for users who can open these tools.
- After remediation, verify the installed ACS Commons version is no longer 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-2021-21043 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/Adobe-Consulting-Services/acs-aem-commons/security/advisories/GHSA-f92j-qf46-p6vmCVE 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.