CVE-2026-20255: Splunk Enterprise · The product does not validate or incorrectly validates input that can affect the control flow or data flow of a program.
Affects Splunk EnterpriseSource CVE Database V5
Not known to be exploited · CVSS 5.7 Medium · fixed in 10.2.4 : update Splunk Enterprise when convenient.
Data as of 30 Oct 2026, 11:52 UTC
- EPSS
- 0.3% chance of exploitation in 30 days – higher than 28% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 10.2.4, 10.0.7, 9.4.12 +5
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:NExploitation evidence
Disclosed: evidence found.
CVE published 10 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade Splunk to 10.2.4, 10.0.7, 9.4.12 or 9.3.13 (Enterprise); 10.3.2512.13, 10.2.2510.15, 10.1.2507.23 or 9.3.2411.132 (Cloud Platform).
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| SplunkSplunk Enterprise | Affected
| Fixed in
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| SplunkSplunk Enterprise | Affected
| Fixed in
|
| SplunkSplunk Enterprise | Affected
| Fixed in
|
| SplunkSplunk Enterprise | Affected
| Fixed in
|
| SplunkSplunk Cloud Platform | Affected
| Fixed in
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| SplunkSplunk Cloud Platform | Affected
| Fixed in
|
AI-suggested
If you cannot patch yet, restrict dashboard creation permissions to trusted users and monitor for unusual dashboard activity involving external content dialogs.
Description
In Splunk Enterprise versions below 10.2.4, 10.0.7, 9.4.12, and 9.3.13, and Splunk Cloud Platform versions below 10.3.2512.13, 10.2.2510.15, 10.1.2507.23, and 9.3.2411.132, a low-privileged user that does not hold the "admin" or "power" Splunk roles could craft a malicious classic dashboard that exfiltrates sensitive data to an external server. The vulnerability exists because URL validation on the external content dialog is incomplete, which can allow for requests to untrusted domains when a user interacts with a crafted dashboard.