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Response snapshot Oct 27, 2026, 03:41 UTC

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VulnerabilityCVE-2026-20253Known exploitation

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.

At a glance

Exploited
Yes: on CISA's Known Exploited list
Severity
9.8 Critical (CVSS 3.1)
Chance of exploitation
96.9% in the next 30 days
CISA federal deadline
Jun 21, 2026: passed
Sources
2 independent sources

What to do

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.

Read CISA KEV entry CVE-2026-20253 (opens a new tab)

CISA federal deadline

Federal due date passed

Applies to covered US federal agencies; it is not your organization's deadline.

Added to the catalog Known ransomware use: Unknown
CISA catalog (opens a new tab)

Scores and how they were measured

CVSS base severity

9.8

Version 3.1As of

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

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

96.9%

Scored Percentile 99.9%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    CISA KEV entry CVE-2026-20253 (opens a new tab)

    The CVE-2026-20253 catalog entry establishes known exploitation, date added, required action, and the federal due date; not zero-day status.

    Published Checked

  2. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-20253, scored 2026-10-26. This is a model estimate, not proof of exposure.

    Published Checked

  3. Primary source

    CVE Program CNA cisco (opens a new tab)

    The published CVE-2026-20253 document's CNA supplies this CVSS 3.1 base score, vector, and authoritative source update date.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, June 18). Splunk Enterprise Missing Authentication for Critical Function Vulnerability (CVE-2026-20253). https://kevwire.com/record/CVE-2026-20253

MLA

"Splunk Enterprise Missing Authentication for Critical Function Vulnerability (CVE-2026-20253)." KEVWire, 18 June 2026, kevwire.com/record/CVE-2026-20253.

Chicago

KEVWire. "Splunk Enterprise Missing Authentication for Critical Function Vulnerability (CVE-2026-20253)." Last modified June 18, 2026. https://kevwire.com/record/CVE-2026-20253.

Evidence summary (plain text)

Splunk Enterprise Missing Authentication for Critical Function Vulnerability (Jun 18, 2026).
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.
CVSS 9.8 (version 3.1; evidence as of Jun 15, 2026; https://cveawg.mitre.org/api/cve/CVE-2026-20253).
EPSS 96.9% for the following 30 days, scored Oct 26, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-20253&date=2026-10-26).
Sources:
CISA KEV entry CVE-2026-20253: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-20253&date=2026-10-26
CVE Program CNA cisco: https://cveawg.mitre.org/api/cve/CVE-2026-20253
Record ID: CVE-2026-20253.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Documented by a cited source.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
CISA federal due date: Jun 21, 2026. This is a deadline for covered US federal agencies, not the reader's SLA.
About this data

This record was ingested from a data source. Retrieved: Oct 27, 2026, 01:40 UTC. Ingestion is not an independent editorial investigation.

CISA added this entry on 2026-06-18. This record's publication date is the catalog addition date, not necessarily the initial vulnerability disclosure. KEV means known exploitation, not necessarily a zero-day. CISA due dates apply to covered US federal agencies, not your organizational SLA.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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