Quick answers
- Is CVE-2026-66981 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-66981 being exploited in the wild.
- How severe is CVE-2026-66981?
- Medium severity, with a CVSS score of 6.5, published 6 November 2026.
- Which products and versions are affected?
- HCL AION.
- Is there a fix for CVE-2026-66981?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-66981 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-66981?
- Check whether you run HCL AION. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The application fails to validate the HTTP Host header value before using it to construct links, redirects, and other responses. An attacker can supply a malicious Host header in HTTP requests, allowing host header injection attacks. This could be exploited for phishing, cache poisoning, or other attacks depending on how the header is used downstream.
Affected products
- HCL AION
Timeline
- 2026-11-06: disclosed