CVE Details
CVE-2026-20253
Splunk Enterprise Missing Authentication for Critical Function Vulnerability
Published: 2026-06-18
CVSS: 9.8 CRITICAL
Product: Splunk Enterprise
Due Date: 2026-06-21
Splunk Enterprise contains a missing authentication for critical function vulnerability which could allow an unauthenticated user to create or truncate arbitrary files through a PostgreSQL sidecar service endpoint.
GitHub PoC
Warning: GitHub PoC repositories are unverified. Some may be fake
or contain malware. Use caution and review code before running anything.
FIRST EPSS
EPSS estimates the probability of exploitation in the next 30 days. Higher values indicate higher likelihood of real-world exploitation.
Timeline
CVE Stalker
KEV
MITRE
GitHub
FIRST (EPSS)
MITRE
CVSS
SSVC
References
Show Raw Data
| Key | Remaining Key | Value |
|---|---|---|
| dataType | CVE_RECORD | |
| dataVersion | 5.2 | |
| cveMetadata > | cveId | CVE-2026-20253 |
| cveMetadata > | assignerOrgId | d1c1063e-7a18-46af-9102-31f8928bc633 |
| cveMetadata > | state | PUBLISHED |
| cveMetadata > | assignerShortName | cisco |
| cveMetadata > | dateReserved | 2025-10-08T11:59:15.401Z |
| cveMetadata > | datePublished | 2026-06-10T17:16:21.242Z |
| cveMetadata > | dateUpdated | 2026-06-18T16:56:00.789Z |
| containers > | cna > affected > 0 > product | Splunk Enterprise |
| containers > | cna > affected > 0 > vendor | Splunk |
| containers > | cna > affected > 0 > versions > 0 > version | 10.2 |
| containers > | cna > affected > 0 > versions > 0 > status | affected |
| containers > | cna > affected > 0 > versions > 0 > versionType | custom |
| containers > | cna > affected > 0 > versions > 0 > lessThan | 10.2.4 |
| containers > | cna > affected > 0 > versions > 1 > version | 10.0 |
| containers > | cna > affected > 0 > versions > 1 > status | affected |
| containers > | cna > affected > 0 > versions > 1 > versionType | custom |
| containers > | cna > affected > 0 > versions > 1 > lessThan | 10.0.7 |
| containers > | cna > descriptions > 0 > lang | en |
| containers > | cna > descriptions > 0 > supportingMedia > 0 > base64 | False |
| containers > | cna > descriptions > 0 > supportingMedia > 0 > type | text/html |
| containers > | cna > descriptions > 0 > supportingMedia > 0 > value | 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. |
| containers > | cna > descriptions > 0 > value | 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. |
| containers > | cna > references > 0 > url | https://advisory.splunk.com/advisories/SVD-2026-0603 |
| containers > | cna > title | Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise |
| containers > | cna > datePublic | 2026-06-10T00:00:00.000Z |
| containers > | cna > metrics > 0 > cvssV3_1 > vectorString | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| containers > | cna > metrics > 0 > cvssV3_1 > version | 3.1 |
| containers > | cna > metrics > 0 > cvssV3_1 > baseScore | 9.8 |
| containers > | cna > metrics > 0 > cvssV3_1 > baseSeverity | CRITICAL |
| containers > | cna > metrics > 0 > format | CVSS |
| containers > | cna > metrics > 0 > scenarios > 0 > lang | en |
| containers > | cna > metrics > 0 > scenarios > 0 > value | GENERAL |
| containers > | cna > problemTypes > 0 > descriptions > 0 > lang | en |
| containers > | cna > problemTypes > 0 > descriptions > 0 > type | cwe |
| containers > | cna > problemTypes > 0 > descriptions > 0 > description | The software does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. |
| containers > | cna > problemTypes > 0 > descriptions > 0 > cweId | CWE-306 |
| containers > | cna > source > advisory | SVD-2026-0603 |
| containers > | cna > credits > 0 > lang | en |
| containers > | cna > credits > 0 > value | Alex Hordijk (hordalex) |
| containers > | cna > providerMetadata > orgId | d1c1063e-7a18-46af-9102-31f8928bc633 |
| containers > | cna > providerMetadata > shortName | cisco |
| containers > | cna > providerMetadata > dateUpdated | 2026-06-15T20:33:56.243Z |
| containers > | adp > 0 > references > 0 > url | https://labs.watchtowr.com/why-use-app-level-auth-when-every-database-has-auth-splunk-enterprise-cve-2026-20253-pre-auth-rce/ |
| containers > | adp > 0 > references > 0 > tags > 0 | exploit |
| containers > | adp > 0 > references > 1 > url | https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20253 |
| containers > | adp > 0 > references > 1 > tags > 0 | government-resource |
| containers > | adp > 0 > metrics > 0 > other > type | ssvc |
| containers > | adp > 0 > metrics > 0 > other > content > timestamp | 2026-06-18T16:55:05.297800Z |
| containers > | adp > 0 > metrics > 0 > other > content > id | CVE-2026-20253 |
| containers > | adp > 0 > metrics > 0 > other > content > options > 0 > Exploitation | active |
| containers > | adp > 0 > metrics > 0 > other > content > options > 1 > Automatable | yes |
| containers > | adp > 0 > metrics > 0 > other > content > options > 2 > Technical Impact | total |
| containers > | adp > 0 > metrics > 0 > other > content > role | CISA Coordinator |
| containers > | adp > 0 > metrics > 0 > other > content > version | 2.0.3 |
| containers > | adp > 0 > title | CISA ADP Vulnrichment |
| containers > | adp > 0 > providerMetadata > orgId | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
| containers > | adp > 0 > providerMetadata > shortName | CISA-ADP |
| containers > | adp > 0 > providerMetadata > dateUpdated | 2026-06-18T16:56:00.789Z |