alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Atlassian Confluence Server-Side Request Forgery (CVE-2021-26072)"; flow:established,to_server; http.uri; content:"/rest/sharelinks/1.0/link|3f|"; fast_pattern; content:"url|3d|"; pcre:"/^[a-z]+(?:\x3a|\x253[aA])(?:\x2f{2}|(?:\x252[fF]){2})/R"; reference:url,github.com/assetnote/blind-ssrf-chains#confluence; reference:cve,2021-26072; classtype:web-application-attack; sid:2065569; rev:1; metadata:affected_product Atlassian_Confluence, attack_target Server, tls_state TLSDecrypt, created_at 2025_10_30, cve CVE_2021_26072, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_30, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)