CVE-2026-21833 (CVSS 3.7)

Description

HCL AION is affected by a vulnerability in which the Content-Security-Policy (CSP) HTTP response header is not configured. CSP helps prevent attacks such as Cross-Site Scripting (XSS) by restricting the sources from which scripts, styles, and other resources can be loaded. The absence of this header may reduce the effectiveness of browser-based security controls, potentially resulting in unintended behavior or negative security impacts under certain conditions.

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CVSS v3.1 Score

3.7

LOW

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

EPSS — Exploit Prediction

0.0021

Probability of exploitation

0.10%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-1032 CWE-1032

References

Other References

https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0134082

Frequently Asked Questions

What is CVE-2026-21833? +

HCL AION is affected by a vulnerability in which the Content-Security-Policy (CSP) HTTP response header is not configured. CSP helps prevent attacks such as Cross-Site Scripting (XSS) by restricting the sources from which scripts, styles, and other resources can be loaded. The absence of this header may reduce the effectiveness of browser-based security controls, potentially resulting in unintended behavior or negative security impacts under certain conditions. It has a CVSS v3.1 base score of 3.7 (LOW).

How severe is CVE-2026-21833? +

CVE-2026-21833 has a CVSS v3.1 score of 3.7 out of 10, rated LOW. This is a low-severity vulnerability with limited impact. The EPSS score is 0.0021, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-21833? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-52650 8.2

Inline script execution allowed in CSP vulnerability has been identified in HCL AION v2.0

CVE-2025-52624 5.4

A vulnerability Bypass of the script allowlist configuration in HCL AION. An incorrectly configured Content-Security-Policy header may allow unauthorized scripts …

CVE-2025-52635 3.7

A rusted types in scripts not enforced in CSP vulnerability has been identified in HCL AION.This issue affects AION: 2.0.

CVE-2026-21833