CVE-2026-20253 (GCVE-0-2026-20253)

Vulnerability from cvelistv5 – Published: 2026-06-10 17:16 – Updated: 2026-06-19 03:55
VLAI CISA Shadowserver Previdian
Title
Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-10 00:00 UTC
CWE
  • CWE-306 - The software does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
Assigner
References
Impacted products
Vendor Product Version CPE status
Splunk Splunk Enterprise Affected: 10.2 , < 10.2.4 (custom)
Affected: 10.0 , < 10.0.7 (custom)
guessed Create a notification for this product.
Date Public
2026-06-10 00:00
Credits
Alex Hordijk (hordalex)
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 446994d6-48cf-44d8-a047-a583e57e9625

Vulnerability ID: CVE-2026-20253

Status: Confirmed

Status Updated: 2026-06-18 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-18
Asserted: 2026-06-18
Scope
Notes: KEV entry: Splunk Enterprise Missing Authentication for Critical Function Vulnerability | Affected: Splunk / Enterprise | Description: 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. | Required action: 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. | Due date: 2026-06-21 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://advisory.splunk.com/advisories/SVD-2026-0603 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-20253
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-306
Feed CISA Known Exploited Vulnerabilities Catalog
Product Enterprise
Due Date 2026-06-21
Date Added 2026-06-18
Vendorproject Splunk
Vulnerabilityname Splunk Enterprise Missing Authentication for Critical Function Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-06-18 17:00 UTC | Updated: 2026-06-18 17:00 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f7c27c22-c307-4af0-b813-e6bbe2df7f54

Vulnerability ID: CVE-2026-20253

Status: Confirmed

Status Updated: 2026-09-07 00:00 UTC

Exploited: Yes

Characteristics
Severity: 98.0
Timestamps
First Seen: 2026-07-09
Asserted: 2026-07-09
Last Seen: 2026-09-07
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Splunk / Splunk | Class: database | Severity: Critical (CVSS 9.8) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-09-07: 37
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 2
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class database
7D Avg 2
Vendor Splunk
30D Avg 2
90D Avg 0
Product Splunk
Cisa Kev yes
Connections 37
Observation Date 2026-09-07
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity Critical
References
Created: 2026-07-11 01:00 UTC | Updated: 2026-09-09 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 217450ae-1eff-41d7-a95c-6e4b5272e4e4

Vulnerability ID: CVE-2026-20253

Status: Confirmed

Status Updated: 2026-06-18 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-18
Asserted: 2026-06-18
Scope
Notes: KEVIntel entry: Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise | Affected: Splunk / Splunk Enterprise | CVSS: 9.8 (CRITICAL) | EPSS: 0.10035 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise
Vendor Splunk
Product Splunk Enterprise
Added Date 2026-06-18T00:00:00.000Z
Cvss Score 9.8
Epss Score 0.10035
Cvss Severity CRITICAL
Epss Percentile 0.95018
Used In Malware unknown
Ahead Of Cisa Kev 
{
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  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:02 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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        "assignerShortName": "cisco",
        "cveId": "CVE-2026-20253",
        "datePublished": "2026-06-10T17:16:21.242Z",
        "dateReserved": "2025-10-08T11:59:15.401Z",
        "dateUpdated": "2026-06-19T03:55:19.206Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.