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CVE-2026-20139

MEDIUMCVSS 4.3/10EPSS 5.15%

Last modified

CVE-2026-20139 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. In Splunk Enterprise versions below 10.2.0, 10.0.2, 9.4.8, 9.3.9, and 9.2.12, and Splunk Cloud Platform versions below 10.2.2510.3, 10.1.2507.8, 10.0.2503.9, and 9.3.2411.121, a low-privileged user that does not hold the "admin" or "power" Splunk roles could craft a malicious payload into the `realname`, `tz`, or `email` parameters of the `/splunkd/__raw/services/authentication/users/username` REST API endpoint when they change a password. This could potentially lead to a client‑side denial‑of‑service (DoS). EPSS estimates a 5.15% chance of exploitation in the next 30 days.

Description

In Splunk Enterprise versions below 10.2.0, 10.0.2, 9.4.8, 9.3.9, and 9.2.12, and Splunk Cloud Platform versions below 10.2.2510.3, 10.1.2507.8, 10.0.2503.9, and 9.3.2411.121, a low-privileged user that does not hold the "admin" or "power" Splunk roles could craft a malicious payload into the `realname`, `tz`, or `email` parameters of the `/splunkd/__raw/services/authentication/users/username` REST API endpoint when they change a password. This could potentially lead to a client‑side denial‑of‑service (DoS). The malicious payload might significantly slow page load times or render Splunk Web temporarily unresponsive.

Metrics

CVSS 3.1
4.3/10

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

EPSS Probability
5.15%

91.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
SplunkSplunk>= 9.2.0, < 9.2.12
SplunkSplunk>= 9.3.0, < 9.3.9
SplunkSplunk>= 9.4.0, < 9.4.8
SplunkSplunk>= 10.0.0, < 10.0.2
SplunkSplunk Cloud Platform>= 9.3.2411, < 9.3.2411.121
SplunkSplunk Cloud Platform>= 10.0.2503, < 10.0.2503.9
SplunkSplunk Cloud Platform>= 10.1.2507, < 10.1.2507.8
SplunkSplunk Cloud Platform>= 10.2.2510, < 10.2.2510.3

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-20139?
In Splunk Enterprise versions below 10.2.0, 10.0.2, 9.4.8, 9.3.9, and 9.2.12, and Splunk Cloud Platform versions below 10.2.2510.3, 10.1.2507.8, 10.0.2503.9, and 9.3.2411.121, a low-privileged user that does not hold the "admin" or "power" Splunk roles could craft a malicious payload into the `realname`, `tz`, or `email` parameters of the `/splunkd/__raw/services/authentication/users/username` REST API endpoint when they change a password. This could potentially lead to a client‑side denial‑of‑service (DoS). The malicious payload might significantly slow page load times or render Splunk Web temporarily unresponsive.
How severe is CVE-2026-20139?
CVE-2026-20139 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 5.15% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20139?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-20139?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST