Quick answers
- Is CVE-2026-21809 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-21809 being exploited in the wild.
- How severe is CVE-2026-21809?
- Low severity, with a CVSS score of 3.9, published 26 August 2026.
- Which products and versions are affected?
- HCL BigFix Quantum Risk Analyzer.
- Is there a fix for CVE-2026-21809?
- 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-2026-21809 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-21809?
- Check whether you run HCL BigFix Quantum Risk Analyzer. 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 an information disclosure flaw in the input validation process of HCL BigFix Quantum Risk Analyzer. When the application encounters malformed input, it returns verbose error messages that reveal details about validation rules and accepted input formats. This verbose error feedback enables attackers to conduct reconnaissance without triggering security alerts and to systematically refine fuzzing campaigns. The vulnerability is network-accessible and requires no authentication or user interaction. An attacker can exploit this to gather intelligence about the application's input handling, potentially facilitating follow-up attacks.
Affected products
- HCL BigFix Quantum Risk Analyzer
Timeline
- 2026-08-26: disclosed