Quick answers
- Is CVE-2026-21850 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-21850 being exploited in the wild.
- How severe is CVE-2026-21850?
- 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-2026-21850?
- 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-2026-21850 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-21850?
- 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 vulnerability is HTTP response header injection (CR/LF injection) in HCL AION caused by insufficient neutralization of carriage return and line feed characters in user-controlled input reflected into HTTP response headers. An attacker can inject headers without authentication by sending crafted requests, potentially leading to session fixation, cache poisoning, or XSS depending on header context.
Affected products
- HCL AION
Timeline
- 2026-11-06: disclosed