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CVE-2026-20253

Missing Authentication for Critical Function — is CVE-2026-20253real, exploitable, or a false positive? Here's the community ground truth.

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Critical · CVSS 9.8EPSS 10.0%CISA KEVCWE-306 · Missing Authentication for Critical Function

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

References

NVD MITRE CVE.org CISA KEV

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Community ground truth

Community verdict

3 verdicts
Not a real issue

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Community real-world severity: Critical (Critical 3) — CVSS base score 9.8

In line with its CVSS base score.

Field notes & remediation

Verdicts are the quick signal — notes are the evidence and fixes behind them.

  • 0
    Field note · Mara OkonkwoCurated

    Splunk Enterprise Missing Authentication for Critical Function Vulnerability — 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. Listed in the CISA KEV catalog (added 2026-06-18) — confirmed exploited in the wild, not theoretical. FIRST EPSS puts the chance of exploitation in the next 30 days at ~10%. Treat it as real and prioritize remediation over triage.

  • 0
    Remediation · Yuki TanakaCurated

    Required action for Splunk Enterprise: 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. CISA set a federal remediation due date of 2026-06-21. After patching, verify the vulnerable path is no longer reachable before closing the finding.

Related CVEs

Same weakness — CWE-306 · Missing Authentication for Critical Function.