Is CVE-2026-21821 in the CISA KEV catalog?

No. CVE-2026-21821 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-21821?

CVE-2026-21821 has a CVSS v3 base score of 8.3 (HIGH).

What is the EPSS score for CVE-2026-21821?

CVE-2026-21821 has an EPSS score of 0.21% (12th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-21821?

No published fix for CVE-2026-21821 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-21821

HIGH

8.3

CVSS v3

NVD

Description

The HCL BigFix SCM Reporting site contains an outdated and unsupported version of the jQuery 1.x library. Since jQuery 1.x has reached end-of-life and no longer receives security updates, it may expose the application to publicly known security weaknesses and increase the risk of client-side attacks such as Cross-Site Scripting (XSS) or manipulation through vulnerable third-party components.

CWE-1104

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Exploit Intelligence

0.21%probability of exploitation in 30 days

12thpercentile

Low risk: more likely to be exploited than 12% of all known CVEs.

References

Other references1

support.hcl-software.com

Related Vulnerabilities

Other CWE-1104 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-7102	Critical	9.8	44%	-	-
CVE-2024-35252	High	7.5	2.5%	-	Fix
CVE-2021-22142	Medium	6.6	1.0%	-	Fix
CVE-2025-34192	Critical	9.8	0.9%	-	Fix
CVE-2022-46871	High	8.8	0.9%	-	Fix
CVE-2025-34193	Critical	9.8	0.7%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-14.