Reflected Cross-site Scripting (XSS) in ACS Commons
Published Feb 2, 2021 · Updated Oct 23, 2026 · Also known as CVE-2021-21028, GHSA-f92j-qf46-p6vm, GHSA-7r83-w6r8-fh6w
Original summary
Normalized public record · Updated Oct 23, 2026
Reflected Cross-site Scripting (XSS) in ACS Commons
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
ACS Commons version 4.9.2 (and earlier) suffers from a Reflected Cross-site Scripting (XSS) vulnerability in version-compare and page-compare due to invalid JCR characters that are not handled correctly. An attacker could potentially exploit this vulnerability to inject malicious JavaScript content into vulnerable form fields and execute it within the context of the victim's browser. Exploitation of this issue requires user interaction in order to be successful.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- LOW
- Confidence
- Not available
- Aliases
- CVE-2021-21028, GHSA-f92j-qf46-p6vm, GHSA-7r83-w6r8-fh6w
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
Record history
Published Feb 2, 2021 · Last refreshed Oct 23, 2026