Vulnerability details
CVE-2026-20253
Actively exploited
Splunk Enterprise
Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise
CVSS 3.1
9.8Critical
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (cisco) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Splunk | Splunk Enterprise | 10.0 ≤ v < 10.0.7 | CVEProject cvelistV5 (CNA) |
| Splunk | Splunk Enterprise | 10.2 ≤ v < 10.2.4 | CVEProject cvelistV5 (CNA) |
References and advisories
3
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Details
- Published
- 2026-06-10
- Last updated
- 2026-06-19
- State
- Published
- Assigner (CNA)
- cisco
- Kolun priority
- 90 · Critical
CISA KEV catalog
- Date added
- 2026-06-18
- Due date
- 2026-06-21
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
96.93%
Probability of exploitation in 30 days
99.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-306The software does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.