CVE-2026-20253
Actively exploited. CVE-2026-20253 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-18) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2026-20253 is indexed in GitHub PoC and Nuclei. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
Serial number: AV26-586 Date: June 10, 2026 Update: June 18, 2026 On June 10, 2026, Splunk published security advisories to address vulnerabilities in the following products: Splunk SOAR – versions prior to 8.5.0 Splunk Enterprise – multiple versions and platforms Splunk Cloud Platform – multiple versions and platforms Update 1 On June 18, 2026, Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2026-20253 to their Known Exploited Vulnerabilities (KEV) Database. The Cyber Centre encourages users and administrators to review the provided web link and apply the necessary updates. Splunk Security Advisories CISA KEV: CVE-2026-20253
CSIRTS triage
- What
- This advisory addresses vulnerabilities in Splunk products.
- Who is affected
- Users of Splunk SOAR, Splunk Enterprise, and Splunk Cloud Platform are affected.
- Urgency
- Remediation is important as exploitation is known and vulnerabilities are present.
- Action
- Update to Splunk SOAR version 8.5.0 or later.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 100% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2026-20253 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
- NucleiA nuclei-templates detection/PoC template exists for this CVE.look it up ↗
Advisory coverage (3)
- unknownexploitedNCSC-2026-0198 [1.01] [M/H] Vulnerabilities fixed in Splunk Enterprise and Splunk Cloud Platformncsc-nl · 2026-06-19
- unknownexploitedSplunk security advisory (AV26-586) – Update 1cccs · 2026-06-18
- criticalexploitedCVE-2026-20253: Splunk Enterprise Missing Authentication for Critical Function Vulnerabilitycisa-kev · 2026-06-18
External references
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[](https://www.csirts.com/cve/CVE-2026-20253)