CVE-2021-43853

HIGH

AjaxPro <21.12.22.1 - XSS

Title source: llm

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.

References (3)

[Patch, Third Party Advisory] https://github.com/michaelschwarz/Ajax.NET-Professional/commit/c89e39b9679fcb8ab6644fe21cc7e652cb615e2b

[Release Notes, Third Party Advisory] https://github.com/michaelschwarz/Ajax.NET-Professional/releases/tag/v21.12.22.1

[Mitigation, Third Party Advisory] https://github.com/michaelschwarz/Ajax.NET-Professional/security/advisories/GHSA-5q7q-qqw2-hjq7

Scores

CVSS v3 8.7

EPSS 0.0024

EPSS Percentile 46.7%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Classification

CWE

CWE-502 CWE-79

Status published

Affected Products (2)

ajax.net_professional_project/ajax.net_professional < 21.12.22.1

nuget/AjaxNetProfessional < 21.12.22.1NuGet

Timeline

Published Dec 22, 2021

Tracked Since Feb 18, 2026