CVE-2026-21833 HCL AION is susceptible to a Missing "Content-Security-Policy" header Vulnerability (CVE-2026-21833)
HCL AION lacks Content-Security-Policy headers, weakening browser security controls and potentially facilitating XSS attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-21833?
CVE-2026-21833 is a low-severity vulnerability in HCL Software AION, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-1032
Which versions are affected by CVE-2026-21833?
How do I fix CVE-2026-21833?
No fix has been published for CVE-2026-21833 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-21833 being exploited?
There is no known exploitation of CVE-2026-21833 in the wild and no public exploit code.
Sources
Also known as GHSA-8876-cgqf-cw39.