In Splunk Enterprise versions below 10.2.2 and 10.0.5, and Splunk Cloud Platform versions below 10.3.2512.8, 10.2.2510.11, 10.1.2507.21, and 10.0.2503.13, a user with a role that has access to the _internal index could view session cookies and response bodies that contain sensitive data.
CVE-2026-20239
HIGHNVD 7.57.5—
EchelonGraph scoreHIGH confidence
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-20. NVD baseline CVSS 7.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, nvd
7.5
- CVSS v3
- 7.5
- EG Score
- 7.5(high)
- EPSS
- 3.0%
- KEV
- Not listed
Published
May 20, 2026
Last Modified
May 21, 2026
References (1)
Frequently asked(5)
What is CVE-2026-20239?
CVE-2026-20239 is a high vulnerability published on May 20, 2026. In Splunk Enterprise versions below 10.2.2 and 10.0.5, and Splunk Cloud Platform versions below 10.3.2512.8, 10.2.2510.11, 10.1.2507.21, and 10.0.2503.13, a user with a role that has access to the _internal index could view session cookies and response bodies that contain sensitive data.
When was CVE-2026-20239 disclosed?
CVE-2026-20239 was first published in the National Vulnerability Database on May 20, 2026, with the most recent update on May 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20239 actively exploited?
CVE-2026-20239 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-20239?
CVE-2026-20239 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-20239?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20239, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-20239
Is Your Infrastructure Affected by CVE-2026-20239?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.