CVE-2023-49289: Ajax.NET Professional (AjaxPro) is an AJAX framework for Microsoft ASP.NET which will create proxy JavaScript

Q: How do I fix CVE-2023-49289?

ajax.net professional: upgrade to 21.12.22.1. Exact commands for each OS are on this page.

Q: Is CVE-2023-49289 being exploited?

CVE-2023-49289 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-49289 affect?

CVE-2023-49289 affects ajax.net professional. Severity is medium (CVSS 6.3). 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 s

Q: How urgent is CVE-2023-49289?

Priority 40/100. On your watchlist

This month

MEDIUM 6.3WATCHLISTUPGRADE

CVE-2023-49289 is a medium-severity flaw (CVSS 6.3) affecting ajax.net professional. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-12-05
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: michaelschwarz

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-12-05 00:15 UTCPublished CVE record published
2026-06-17 06:35 UTCUpdated Record last modified

michaelschwarz ajax.net professional UPGRADE

Affected: < 21.12.22.1

Fixed in: 21.12.22.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ajax.net-professional || rpm -q ajax.net-professional || ajax.net-professional --version

2. UPGRADE to 21.12.22.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ajax.net-professional

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ajax.net-professional

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-49289?

ajax.net professional: upgrade to 21.12.22.1. Exact commands for each OS are on this page.

Is CVE-2023-49289 being exploited?

CVE-2023-49289 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-49289 affect?

CVE-2023-49289 affects ajax.net professional. Severity is medium (CVSS 6.3). 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 s

How urgent is CVE-2023-49289?

Priority 40/100. On your watchlist

Software pages

.NET vulnerabilities

Related CVEs

CVE-2021-23758 HIGH 8.1 EXPLOITED MITIGATE UPGRADE Ajax.NET Professional Deserialization of Untrusted Data Vulnerability
CVE-2021-43853 HIGH 8.7 UPGRADE Ajax.NET Professional (AjaxPro) is an AJAX framework available for Microsoft ASP.NET

References

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