Is there a public exploit for CVE-2026-21834?

No public exploit for CVE-2026-21834 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-21834?

CVE-2026-21834 scores CVSS 3.1 (v3.1), rated low.

What does CVE-2026-21834 affect?

CVE-2026-21834 affects HCL Software HCL AION.

3.1 Low

HCL AION is affected by a vulnerability where the Content-Security-Policy (CSP) security response header was missing from application…

CVE-2026-21834

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.

Assessment

CVSS: 3.1 (v3.1)
Severity: Low
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 6 November 2026
Last updated: 6 November 2026
Affected: HCL Software · HCL AION
Assigner: HCL

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

At the source

EUVD (ENISA)

References

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

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