Is CVE-2026-20202 in the CISA KEV catalog?

No. CVE-2026-20202 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-20202?

CVE-2026-20202 has a CVSS v3 base score of 6.6 (MEDIUM).

What is the EPSS score for CVE-2026-20202?

CVE-2026-20202 has an EPSS score of 0.25% (16th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-20202?

Upgrade splunk to 10.2.2 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2026-20202

MEDIUM

6.6

CVSS v3

NVD

Description

In Splunk Enterprise versions below 10.2.2, 10.0.5, 9.4.10, and 9.3.11, and Splunk Cloud Platform versions below 10.4.2603.0, 10.3.2512.6, 10.2.2510.10, 10.1.2507.20, 10.0.2503.13, and 9.3.2411.127, a user who holds a role that contains the high-privilege capability `edit_user`could create a specially crafted username that includes a null byte or a non-UTF-8 percent-encoded byte due to improper input validation. This could lead to inconsistent conversion of usernames into a proper format for storage and account management inconsistencies, such as being unable to edit or delete affected users.

CWE-176

How to fix

Remediation Available

splunkNVD

Affected:>= 10.2.0, < 10.2.2Fixed in:10.2.2CVE-2026-20202derived from NVD

splunk cloud platformNVD

Affected:>= 10.3.2512, < 10.3.2512.6Fixed in:10.3.2512.6CVE-2026-20202derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.25%probability of exploitation in 30 days

16thpercentile

Low risk: more likely to be exploited than 16% of all known CVEs.

References

Vendor Advisory1

advisory.splunk.com

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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 2026-04-17.