CVE-2026-20139 (GCVE-0-2026-20139)

Vulnerability from cvelistv5 – Published: 2026-02-18 16:45 – Updated: 2026-02-19 19:28
VLAI?
Title
Client-Side Denial of Service (DoS) through ''/splunkd/__raw/services/authentication/users/username'' REST API endpoint in Splunk Enterprise
Summary
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.
Severity ?
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CWE
  • CWE-400 - The software does not properly control the allocation and maintenance of a limited resource thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
Assigner
References
Impacted products
Vendor Product Version
Splunk Splunk Enterprise Affected: 10.0 , < 10.0.2 (custom)
Affected: 9.4 , < 9.4.8 (custom)
Affected: 9.3 , < 9.3.9 (custom)
Affected: 9.2 , < 9.2.12 (custom)
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    Splunk Splunk Cloud Platform Affected: 10.2.2510 , < 10.2.2510.3 (custom)
Affected: 10.1.2507 , < 10.1.2507.8 (custom)
Affected: 10.0.2503 , < 10.0.2503.9 (custom)
Affected: 9.3.2411 , < 9.3.2411.121 (custom)
Create a notification for this product.
Credits
STÖK / Fredrik Alexandersson
Show details on NVD website
To clipboard 

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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