CVE-2026-20253 KEV
9.8
CRITICAL · CVSS 3.1 · EPSS 96.9% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2026-06-21.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 96.94% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-306 |
| On CISA KEV | yes — remediate by 2026-06-21 |
| Public exploit | none known |
| Published | 2026-06-10 |
| Last modified | 2026-07-23 |
CISA KEV
| Name | Splunk Enterprise Missing Authentication for Critical Function Vulnerability |
|---|---|
| Added | 2026-06-18 |
| Due | 2026-06-21 |
| Vendor / product | Splunk / Enterprise |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| splunk | splunk |
References
→ the Explorer · watch your stack · NVD