How severe is CVE-2026-21833?

CVE-2026-21833 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-21833 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-21833?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-21833 published?

CVE-2026-21833 was published on 2026-10-01 and last updated on 2026-10-02.

CVE-2026-21833

CVE-2026-21833 is a low-severity vulnerability with a CVSS 3.x base score of 3.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1032.

Key facts

Severity: Low (CVSS 3.x base score 3.7)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1032
Published: 2026-10-01
Last modified: 2026-10-02

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.

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.
How severe is CVE-2026-21833?: CVE-2026-21833 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-21833 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-21833?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-21833 published?: CVE-2026-21833 was published on 2026-10-01 and last updated on 2026-10-02.

References

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

Other CWE-1032 vulnerabilities

CVE-2025-52650 — High (CVSS 8.2): Inline script execution allowed in CSP vulnerability has been identified in HCL AION v2.0
CVE-2025-52629 — Low (CVSS 3.7): HCL AION is susceptible to Missing Content-Security-Policy. An The absence of a CSP header may increase the risk of…
CVE-2025-52635 — Low (CVSS 3.7): A rusted types in scripts not enforced in CSP vulnerability has been identified in HCL AION.This issue affects…

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