CVE-2026-20239

Description

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.

CVSS v3.1 Score

7.5

HIGH

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

EPSS — Exploit Prediction

0.0049

Probability of exploitation

0.38%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-532 CWE-532

Affected Products

Vendor	Product	Versions
splunk	splunk	10.0.0 — 10.0.5
splunk	splunk	10.2.0 — 10.2.2
splunk	splunk_cloud_platform	10.0.2503 — 10.0.2503.13
splunk	splunk_cloud_platform	10.1.2507 — 10.1.2507.21
splunk	splunk_cloud_platform	10.2.2510 — 10.2.2510.11
splunk	splunk_cloud_platform	10.3.2512 — 10.3.2512.8

References

Advisories & Patches

https://advisory.splunk.com/advisories/SVD-2026-0503

Frequently Asked Questions

What is CVE-2026-20239? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-20239? +

CVE-2026-20239 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0049, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-20239? +

CVE-2026-20239 affects products from splunk, specifically: splunk, splunk_cloud_platform. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-20239? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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