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CVE-2026-20253

Splunk Enterprise Missing Authentication for Critical Function

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 96.9%
  1. Published10 Jun 2026
  2. Added to CISA KEV18 Jun 2026
  3. Remediation due21 Jun 2026
Actively exploited (CISA KEV)

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.

Added to KEV: 18 Jun 2026Federal remediation due: 21 Jun 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Splunk≥ 10.0.0 < 10.0.7 · ≥ 10.2.0 < 10.2.4

Remediation

Fixed in
Splunk≥ 10.0.7

References

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Frequently asked

Is CVE-2026-20253 being actively exploited?

Yes. CVE-2026-20253 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 18 Jun 2026.

How severe is CVE-2026-20253?

CVE-2026-20253 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 96.9% probability of exploitation.

Which products are affected by CVE-2026-20253?

Affected products include Splunk.

How do I fix CVE-2026-20253?

Upgrade affected software to a fixed version, for example Splunk 10.0.7 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-20253 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.