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CVE-2026-20253

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 authenticat…

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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 9.8 (CRITICAL) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
9.0/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 9.8: +1.47
  • Fresh EPSS: 96.94%: +0.48

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 18 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

https://tech-insider.org/
Press · 24 Jul 2026, 07:00 · Splunk Zero-Day CVE-2026-20253: CVSS 9.8, CISA KEV [2026] - https://tech-insider.org/
Recorded Future
Press · 10 Jul 2026, 07:00 · June 2026 CVE Landscape - Recorded Future
Rescana
Press · 21 Jun 2026, 07:00 · Active Exploitation of Critical CVE-2026-20253 in Splunk Enterprise: Unauthenticated RCE via PostgreSQL Sidecar Service - Rescana
Security Affairs
Press · 19 Jun 2026, 07:00 · U.S. CISA adds Splunk Enterprise flaw to its Known Exploited Vulnerabilities catalog and urges agencies to... - Security Affairs
SOCRadar
Press · 19 Jun 2026, 07:00 · CVE-2026-20253: CISA Warns of Actively Exploited Splunk Enterprise RCE - SOCRadar
See all 18 source documents
CyberSecurityNews
Press · 19 Jun 2026, 07:00 · CISA Warns of Splunk Enterprise Critical Function Vulnerability Actively Exploited in Attacks - CyberSecurityNews
Help Net Security
Press · 19 Jun 2026, 07:00 · Unauthenticated RCE in Splunk Enterprise under active attack (CVE-2026-20253) - Help Net Security
SecurityWeek
Press · 19 Jun 2026, 07:00 · Splunk Enterprise Vulnerability Exploited in Attacks Days After Disclosure - SecurityWeek
BleepingComputer
Press · 19 Jun 2026, 07:00 · CISA: Splunk Enterprise flaw actively exploited, patch by Sunday - BleepingComputer
Resecurity
Press · 16 Jun 2026, 07:00 · CVE-2026-20253: Splunk Enterprise Pre-Authentication Remote Code Execution - Resecurity
The Hacker News
Press · 13 Jun 2026, 07:00 · Critical Splunk Enterprise Flaw Lets Attackers Run Code Without Authentication - The Hacker News
CyberSecurityNews
Press · 13 Jun 2026, 07:00 · Splunk Enterprise Pre-Auth RCE Chain Exposes Database With Zero Authentication - CyberSecurityNews
watchTowr Labs
Press · 12 Jun 2026, 20:35 · Why Use App-Level Auth When Every Database Has Auth? (Splunk Enterprise CVE-2026-20253 Pre-Auth RCE)
watchTowr Labs
Press · 12 Jun 2026, 20:35 · Why Use App-Level Auth When Every Database Has Auth? (Splunk Enterprise CVE-2026-20253 Pre-Auth RCE)
watchTowr Labs
Press · 12 Jun 2026, 07:00 · Why Use App-Level Auth When Every Database Has Auth? (Splunk Enterprise CVE-2026-20253 Pre-Auth RCE) - watchTowr Labs
Hong Kong Computer Emergency Response Team Coordination Centre
Press · 12 Jun 2026, 07:00 · Splunk Products Multiple Vulnerabilities - Hong Kong Computer Emergency Response Team Coordination Centre
CyberSecurityNews
Press · 11 Jun 2026, 07:00 · Multiple Splunk Enterprise Vulnerabilities Allow Attackers to Execute Malicious Script - CyberSecurityNews
SecurityWeek
Press · 11 Jun 2026, 07:00 · Splunk, Palo Alto Networks Patch Severe Vulnerabilities - SecurityWeek

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 9.0 (2026-11-02 15:14). The curve appears once the score changes.

Public exploit evidence

2

Public exploit entries / repo candidates

See 2 repos with metrics
RepositoryStarsForksLanguageUpdated
fevar54/CVE-2026-20253-Splunk-Enterprise-Pre-Auth-RCE-00Python26 Jun 2026, 18:31
pssec-io/CVE-2026-2025300Dockerfile29 Jun 2026, 08:01
Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 9.8; EPSS 96.9%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, no user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 14:00:00.097835+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
10 Jun 2026, 17:16
First press mention
11 Jun 2026, 07:00
Added to the CISA KEV catalog
18 Jun 2026, 00:00
Latest press mention
24 Jul 2026, 07:00
Score calculated
05 Nov 2026, 14:00
PoCs on GitHub
2 repositories
Source: CVE List V5 · CISA KEV · FIRST EPSS · GitHub · RSSVulnRadar