ET WEB_SPECIFIC_APPS Splunk Enterprise Authentication REST API Authenticated Client-Side DoS (CVE-2026-20139)

SID: 2069968Rev: 111 views

Fileemerging-web_specific_apps.rules

CreatedJune 16, 2026

UpdatedJune 16, 2026

Classificationattempted-dos

alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET WEB_SPECIFIC_APPS Splunk Enterprise Authentication REST API Authenticated Client-Side DoS (CVE-2026-20139)"; flow:established,to_server; http.uri; content:"/splunkd/__raw/services/authentication/users/username"; fast_pattern; pcre:"/^.*?(?:realname|tz|email)\x3d[^&]{64,}/R"; reference:url,advisory.splunk.com/advisories/SVD-2026-0204; classtype:attempted-dos; sid:2069968; rev:1; metadata:affected_product Splunk, attack_target Server, tls_state TLSDecrypt, created_at 2026_06_16, cve CVE_2026_20139, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_06_16, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)

References

url	advisory.splunk.com/advisories/SVD-2026-0204

Metadata

affected productSplunk

attack targetServer

tls stateTLSDecrypt

created at2026_06_16

cve

CVE-2026-20139

deploymentSSLDecrypt

confidenceHigh

signature severityMajor

tagExploit

updated at2026_06_16

mitre tactic idTA0001

mitre tactic nameInitial_Access

mitre technique idT1190

mitre technique nameExploit_Public_Facing_Application

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