6.6

CVE-2026-20202: splunk Improper Handling of Unicode Encoding

CVSS: 6.6v3.1MediumAnalyzed
Published 15-04-2026Last modified 16-04-2026
Open JSON

Vulnerability summary

CVE-2026-20202 is a medium (CVSS 6.6) Improper Handling of Unicode Encoding vulnerability in splunk. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 14.8% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.6/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.25%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 15-04-2026
    PublishedVulnerability first disclosed.
  2. 16-04-2026
    Last modifiedVulnerability information updated.

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.<br><br>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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

0.00 pp

From 0.25% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.25%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Splunk3 products
  • splunk≥ 9.3.0, < 9.3.11 | ≥ 9.4.0, < 9.4.10 | ≥ 10.0.0, < 10.0.5 | ≥ 10.2.0, < 10.2.2
  • splunk_cloud_platform≥ 10.4.2603, < Not Affected | ≥ 9.3.2411, < 9.3.2411.127 | ≥ 10.0.2503, < 10.0.2503.13 | ≥ 10.1.2507, < 10.1.2507.20 | ≥ 10.2.2510, < 10.2.2510.10 | ≥ 10.3.2512, < 10.3.2512.6
  • splunk enterprise≥ 10.2, < 10.2.2 | ≥ 10.0, < 10.0.5 | ≥ 9.4, < 9.4.10 | ≥ 9.3, < 9.3.11

1 vendor · 3 products

References

1 links