HCL AION is susceptible to a Missing "Content-Security-Policy" header Vulnerability (CVE-2026-21833)

published 2026-10-01 38 d ago modified 2026-10-02 37 d ago also EUVD-2026-90966

cvss: 3.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits: 0; none known

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.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 38 d ago (2026-10-01)

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	3.7	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

HCL Software AION

Classification

Weakness

CWE-1032 OWASP Top Ten 2017 Category A6 - Security Misconfiguration

References

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

Sources

CVE List CVE-2026-21833
NVD CVE-2026-21833

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Summary