ET EXPLOIT Microsoft Exchange Server MRSProxy Trigger File Write via PSTSession.Open() (CVE-2026-62911)

7.0.3 5.0SID: 2071834Rev: 1Enabled2 views

Fileemerging-exploit.rules

CreatedAugust 28, 2026

UpdatedAugust 28, 2026

Classificationattempted-user

alert http any any -> $HOME_NET any (msg:"ET EXPLOIT Microsoft Exchange Server MRSProxy Trigger File Write via PSTSession.Open() (CVE-2026-62911)"; flow:established,to_server; flowbits:isset,ET.MSExchange.CVE-2026-62911.WCF; http.uri; content:"/Microsoft.Exchange.MailboxReplicationService.ProxyService"; fast_pattern; http.header; to_lowercase; content:"/imailboxreplicationproxyservice/imailbox_connect"; http.method; content:"POST"; reference:url,github.com/hypnguyen1209/cve-2026-62911; reference:cve,2026-62911; classtype:attempted-user; sid:2071834; rev:1; metadata:affected_product Microsoft_Exchange, attack_target Server, tls_state TLSDecrypt, created_at 2026_08_28, cve CVE_2026_62911, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, updated_at 2026_08_28, 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	github.com/hypnguyen1209/cve-2026-62911
cve	2026-62911

Metadata

affected productMicrosoft_Exchange

attack targetServer

tls stateTLSDecrypt

created at2026_08_28

cve

CVE-2026-62911

deploymentInternal

confidenceMedium

signature severityMajor

tagExploit

updated at2026_08_28

mitre tactic idTA0001

mitre tactic nameInitial_Access

mitre technique idT1190

mitre technique nameExploit_Public_Facing_Application

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