# CVE-2026-21834: HCL AION is affected by multiple security vulnerabilities.

Status: published. Published: 2026-11-06. Updated: 2026-11-10.

HCL AION is affected by a vulnerability where the Content-Security-Policy (CSP) security response header was missing from application responses. Without this header, the browser does not restrict the sources of scripts and other content, increasing exposure to cross-site scripting and content-injection attacks, potentially resulting in unintended behavior or security impact under certain conditions.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- HCL Software / HCL AION: Version 2.7.0 (affected). Source: CNA: HCL

## Severity and prioritization

- CVSS 3.1: 3.1 (low); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N; source: CNA: HCL

- CVSS 3.1: 3.1 (low); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N; source: NVD: psirt@hcl.com

- CISA KEV: No listing in collected sources

- EPSS: 0.15% as of 2026-11-10; percentile 4.42%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-1021

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0135217 (CNA: HCL)

- https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0135217 (psirt@hcl.com)

## Provenance

- CNA: HCL: https://www.cve.org/CVERecord?id=CVE-2026-21834; retrieved 2026-11-10; source updated 2026-11-10

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-21834; retrieved 2026-11-07; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-21834; retrieved 2026-11-10; source updated Not reported

Revision: b70e49891c3ba4ff1b66a490f2aebbc1ff849dcbb5dfa1c1340666f1475da4c7

Canonical: https://y2.dev/cve/CVE-2026-21834

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