CVE-2026-20253— Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise
Public Exploits 1
Nuclei · 1 CVE-2026-20253.yaml [template]
In-the-Wild Activity Observed cisa_kev · confirmed github_trending · low
Possible ATT&CK Techniques 2AI
T1530 · Data from Cloud Storage T1059 · Command and Scripting InterpreterAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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
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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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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
- CVE-2026-20298
Sensitive Information Disclosure through the storage/passwor - CVE-2026-20296
SPL Command Safeguards Bypass through Cross-Site Request For - CVE-2026-20297
Path Traversal through 'explicit_appname' in the App Install - CVE-2026-20258
Stored Cross-Site Scripting (XSS) through Classic Dashboard - CVE-2026-20252
Server-Side Request Forgery (SSRF) through Dashboard Studio
Same vendor: Splunk
- CVE-2026-20298
Sensitive Information Disclosure through the storage/passwor - CVE-2026-20296
SPL Command Safeguards Bypass through Cross-Site Request For - CVE-2026-20297
Path Traversal through 'explicit_appname' in the App Install - CVE-2026-20266
OS Command Injection in the btool Configuration Helper in Sp - CVE-2026-20265
Insecure Default Domain Allowlist in Splunk AI Toolkit
Same weakness: CWE-306
- CVE-2026-56677
9Router: Authenticated Server-Side Request Forgery (SSRF) vi - CVE-2026-75479
JimuReport Unauthenticated Report Listing and Share Token Di - CVE-2026-75060
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LB-Link WR1210M Backup Endpoint backup.cgi main missing auth
V. Comments for CVE-2026-20253
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