ET WEB_SPECIFIC_APPS Microsoft SharePoint Authentication Bypass and Privilege Escalation (CVE-2023-29357)

7.0.35.0SID: 2071421Rev: 1Enabled4 views
Sourceet/open
Fileemerging-web_specific_apps.rules
CreatedAugust 7, 2026
UpdatedAugust 7, 2026
Classificationweb-application-attack
alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET WEB_SPECIFIC_APPS Microsoft SharePoint Authentication Bypass and Privilege Escalation (CVE-2023-29357)"; flow:established,to_server; http.uri; content:"/_api/web/siteusers"; fast_pattern; http.header; content:"X-PROOF_TOKEN|3a 20|"; base64_decode:relative; base64_data; content:"|22|alg|22 3a 22|none|22|"; reference:url,sec.vnpt.vn/2023/08/phan-tich-cve-2023-29357-microsoft-sharepoint-validatetokenissuer-authentication-bypass-vulnerability; reference:cve,2023-29357; classtype:web-application-attack; sid:2071421; rev:1; metadata:affected_product Microsoft_Sharepoint, attack_target Server, tls_state TLSDecrypt, created_at 2026_08_07, cve CVE_2023_29357, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_08_07, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)

References

urlsec.vnpt.vn/2023/08/phan-tich-cve-2023-29357-microsoft-sharepoint-validatetokenissuer-authentication-bypass-vulnerability
cve2023-29357

Metadata

affected productMicrosoft_Sharepoint
attack targetServer
tls stateTLSDecrypt
created at2026_08_07
deploymentSSLDecrypt
confidenceHigh
signature severityMajor
tagExploit
updated at2026_08_07
mitre tactic idTA0001
mitre tactic nameInitial_Access
mitre technique idT1190
mitre technique nameExploit_Public_Facing_Application

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