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CVE-2026-20253

99
FAUCET Score

In Splunk Enterprise 10.2 versions below 10.2.4 and 10 versions below 10.0.7, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint. The vulnerability exists because the PostgreSQL sidecar service endpoint lacks authentication controls, allowing any network-reachable user to invoke file operations without credentials. Splunk Enterprise versions 9.4 and earlier are not affected. If you cannot immediately upgrade to a fixed version, you can mitigate this vulnerability by disabling the PostgreSQL sidecar service.

First published: Jun 10, 2026Last modified: Jun 15, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 10.0.0, < 10.0.7CPE matchmatch criteria
cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:*
>= 10.2.0, < 10.2.4CPE matchmatch criteria
cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:*
>= 10.0, < 10.0.7CPE match
cpe:2.3:a:splunk:splunk:*:*:*:*:*:*:*:*
>= 10.2, < 10.2.4CPE match
cpe:2.3:a:splunk:splunk:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
96.23%
Probability of exploitation in next 30 days
EPSS Percentile
99.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Jun 18, 2026
Nuclei: CVE-2026-20253 · Jun 13, 2026
This CVE's current EPSS score of 0.9623 is in the 99th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

labs.watchtowr.com / why-use-app-level-auth-when-every-database-has-auth-splunk-enterprise-cve-2026-20253-pre-auth-rce
ExploitThird Party Advisory
cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
advisory.splunk.com / advisories/SVD-2026-0603
MitigationVendor Advisory