# CVE-2026-66981: 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 application trusted the value of the HTTP Host header supplied in requests without validation. An attacker could manipulate this header to influence links, redirects or responses generated by the application, 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: V 2.7.0 (affected). Source: CNA: HCL

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L; source: CNA: HCL

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L; source: NVD: psirt@hcl.com

- CISA KEV: No listing in collected sources

- EPSS: 0.13% as of 2026-11-10; percentile 2.70%

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

- Weaknesses: CWE-74

## 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-2026-66981; retrieved 2026-11-10; source updated 2026-11-10

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-66981; retrieved 2026-11-07; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-66981; retrieved 2026-11-10; source updated Not reported

Revision: 088295f998b7a569f89ff3a3e854731bc5b771e8061d624216d697199df9e42c

Canonical: https://y2.dev/cve/CVE-2026-66981

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