CVE-2026-20253
criticalpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.969 · 100 %ileexploit · PoCDEEUNLUSadded 2026-06-18remediate by 2026-06-21
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.
EPSS · scored 2026-10-24
Splunk Enterprise Missing Authentication for Critical Function Vulnerability
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
exploits (7)
Public proof-of-concept and weaponised exploit code.
- 0xBlackash/CVE-2026-20253CVE-2026-20253PoC · poc_in_github
- HORKimhab/CVE-2026-20253CVE-2026-20253 - Splunk EnterprisePoC · poc_in_github
- Het-Kalariya/CVE-2026-20253Het-Kalariya/CVE-2026-20253PoC · poc_in_github
- ivanesk315/CVE-2026-20253ivanesk315/CVE-2026-20253PoC · poc_in_github
- pssec-io/CVE-2026-20253POC for CVE-2026-20253PoC · poc_in_github
affected products (16)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- NCSC-2026-0198Kwetsbaarheden verholpen in Splunk Enterprise en Splunk Cloud PlatformNL2026-06-15csaf · ncsc_nlNL
Splunk heeft meerdere kwetsbaarheden verholpen in Splunk Enterprise en Splunk Cloud Platform.
- WID-SEC-W-2026-1877Splunk Enterprise: Mehrere SchwachstellenDeutsch2026-06-10csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Splunk Enterprise ausnutzen, um beliebigen Code auszuführen, Cross-Site-Scripting-Angriffe durchzuführen, Daten zu manipulieren, Sicherheitsmaßnahmen zu umgehen oder vertrauliche Informationen offenzulegen.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (6)
External citations — patches, advisories, analysis.
- https://advisory.splunk.com/advisories/SVD-2026-0603Patchcnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2026-20253cnnvd
- https://advisory.splunk.com/advisories/SVD-2026-0603enisa_euvd
- https://advisory.splunk.com/advisories/SVD-2026-0603MitigationVendor Advisorynvd
- https://labs.watchtowr.com/why-use-app-level-auth-when-every-database-has-auth-splunk-enterprise-cve-2026-20253-pre-auth-rce/ExploitThird Party Advisorynvd
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20253US Government Resourcenvd
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