In CISA KEV9.8 CriticalCWE-306
CVE-2026-20253
Splunk Enterprise Missing Authentication for Critical Function Vulnerability
SplunkEnterprise
Status
- Exploited in the wild
- In CISA KEV since 18 Jun
- Vendor fix available
Federal deadlineSun 21 Jun, 23:59 UTC
Passed 125 days ago
CISA KEV · added 18 Jun
Exploit probabilityEPSSchecked 25 Oct
97%probability of exploitation in the next 30 days
Higher than 100% of scored CVEs
SeverityCVSS
9.8Critical
Description NVD
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.
CISA required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Coverage 8 articles · 5 outlets
See the full timelineShow as table
| Published (UTC) | Outlet | Headline |
|---|---|---|
| Thu 11 Jun · 04:21 UTC | SecurityOnline | Check Point VPN under attack as Splunk issues urgent patches |
| Thu 11 Jun · 11:10 UTC | SecurityWeek | Palo Alto fixes Cortex flaw: Splunk patches Enterprise bug |
| Thu 18 Jun · 19:00 UTC | SecurityOnline | Splunk CVE-2026-20253: CVSS 9.8 RCE Exploited in the Wild |
| Thu 18 Jun · 22:30 UTC | CISA | CISA flags critical Splunk flaw enabling unauthenticated file edits |
| Thu 18 Jun · 23:52 UTC | CISA | CISA Adds Splunk Auth Bypass Flaw to KEV Catalog, Urging Patches |
| Fri 19 Jun · 04:40 UTC | SecurityWeek | Splunk Enterprise Vulnerability Exploited in Attacks Days After Disclosure |
| Fri 19 Jun · 11:10 UTC | Security Affairs | CISA adds Splunk flaw CVE-2026-20253, urges patch by June 21 |
| Fri 19 Jun · 15:40 UTC | SOCRadar | CVE-2026-20253 Splunk bug lets hackers run code remotely |
- CVE-2026-20253 Splunk bug lets hackers run code remotelySOCRadar
- CISA adds Splunk flaw CVE-2026-20253, urges patch by June 21Security Affairs
- Splunk Enterprise Vulnerability Exploited in Attacks Days After DisclosureSecurityWeek
- CISA Adds Splunk Auth Bypass Flaw to KEV Catalog, Urging PatchesCISA · official notice
- CISA flags critical Splunk flaw enabling unauthenticated file editsCISA · official notice
- Splunk CVE-2026-20253: CVSS 9.8 RCE Exploited in the WildSecurityOnline
- Palo Alto fixes Cortex flaw: Splunk patches Enterprise bugSecurityWeek · mentions it in passing
- Check Point VPN under attack as Splunk issues urgent patchesSecurityOnline · first in our coverage · mentions it in passing