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CVE-2026-20253— Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise

Quick assessment

Affected
Splunk Splunk Enterprise
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Splunk Cloud Platform和Splunk Enterprise都是美国Splunk公司的产品。Splunk Cloud Platform是一个强大的数据收集、处理和分析服务。Splunk Enterprise是一套数据收集分析软件。 Splunk Enterprise 10.2.4之前版本和10.0.7之前版本、Splunk Cloud Platform 10.4.2604.3之前版本和10.2.2510.14之前版本存在访问控制错误漏洞，该漏洞源于PostgreSQL sidecar服务

CVSS 9.8 · Critical KEV EPSS 96.94% · P100

Public Exploits 1

Nuclei · 1 CVE-2026-20253.yaml [template]

Affected Version Matrix 2

VendorProduct Version RangeStatus
Splunk Splunk Enterprise 10.2< 10.2.4 affected
10.0< 10.0.7 affected
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I. Basic Information for CVE-2026-20253

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Splunk Cloud Platform和Splunk Enterprise 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Splunk Cloud Platform和Splunk Enterprise都是美国Splunk公司的产品。Splunk Cloud Platform是一个强大的数据收集、处理和分析服务。Splunk Enterprise是一套数据收集分析软件。 Splunk Enterprise 10.2.4之前版本和10.0.7之前版本、Splunk Cloud Platform 10.4.2604.3之前版本和10.2.2510.14之前版本存在访问控制错误漏洞，该漏洞源于PostgreSQL sidecar服务
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Splunk Splunk Enterprise 10.2 ~ 10.2.4 -

II. Public POCs for CVE-2026-20253

# POC Description Source Link Shenlong Link
1 In Splunk Enterprise versions below 10.2.4 and 10.0.7, and Splunk Cloud Platform versions below 10.4.2604.3 and 10.2.2510.14, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint.<br><br>The vulnerability exists because the PostgreSQL sidecar service endpoint lacks authentication controls, allowing any network-reachable user to invoke file operations without credentials. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-20253.yaml POC Details
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default-local-qwen3.6 · 12982 chars
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III. Intelligence Information for CVE-2026-20253

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Vendor Advisories for CVE-2026-20253 (1)

Same Patch Batch · Splunk · 2026-06-10 · 10 CVEs total

CVE-2026-20251 8.8 HIGH Remote Code Execution through Deserialization of Untrusted Data in Splunk Secure Gateway
CVE-2026-20252 7.6 HIGH Server-Side Request Forgery (SSRF) through Dashboard Studio PDF Export in Splunk Enterpris
CVE-2026-20258 7.1 HIGH Stored Cross-Site Scripting (XSS) through Classic Dashboard in Splunk Enterprise
CVE-2026-20254 5.7 MEDIUM Information Disclosure through External Content Restriction Bypass in Splunk Enterprise
CVE-2026-20257 5.7 MEDIUM Improper Input Validation through Classic Dashboard CSS in Splunk Enterprise
CVE-2026-20255 5.7 MEDIUM Improper Input Validation through Classic Dashboards in Splunk Enterprise
CVE-2026-20256 5.7 MEDIUM Improper Input Validation through Protocol-Relative URL in Classic Dashboards in Splunk En
CVE-2026-20259 5.5 MEDIUM Improper Access Control in Splunk Enterprise
CVE-2026-20260 4.3 MEDIUM Log Injection through HTTP Request Paths in Splunk SOAR

IV. Related Vulnerabilities

Same product: Splunk Enterprise
Same vendor: Splunk
Same weakness: CWE-306

V. Comments for CVE-2026-20253

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