High severity8.7NVD Advisory· Published Dec 22, 2021· Updated Jun 17, 2026
CVE-2021-43853
CVE-2021-43853
Description
Ajax.NET Professional (AjaxPro) is an AJAX framework available for Microsoft ASP.NET. Affected versions of this package are vulnerable to JavaScript object injection which may result in cross site scripting when leveraged by a malicious user. The affected core relates to JavaScript object creation when parsing json input. Releases before version 21.12.22.1 are affected. A workaround exists that replaces one of the core JavaScript files embedded in the library. See the GHSA-5q7q-qqw2-hjq7 for workaround details.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
AjaxNetProfessionalNuGet | < 21.12.22.1 | 21.12.22.1 |
Affected products
2- michaelschwarz/Ajax.NET-Professionalv5Range: < 21.12.22.1
Patches
Vulnerability mechanics
References
5- github.com/michaelschwarz/Ajax.NET-Professional/commit/c89e39b9679fcb8ab6644fe21cc7e652cb615e2bnvdPatchThird Party AdvisoryWEB
- github.com/advisories/GHSA-5q7q-qqw2-hjq7ghsaADVISORY
- github.com/michaelschwarz/Ajax.NET-Professional/releases/tag/v21.12.22.1nvdRelease NotesThird Party AdvisoryWEB
- github.com/michaelschwarz/Ajax.NET-Professional/security/advisories/GHSA-5q7q-qqw2-hjq7nvdMitigationThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2021-43853ghsaADVISORY
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