After a few weeks of testing, Skype is rolling out a higher participant limit for calls to everyone.
What you need to know
Skype 8.66 is now available.
The update brings support for up to 100 people in Skype calls.
The update also includes several fixes.
Skype 8.66 is now generally available. The latest update to Skype brings support for up to 100 participants within calls. It also includes several bug fixes and stability improvements.
Here is the complete changelog for the update, as found on a Microsoft Answers post:
It's a big room: Now you can have those big conversations, because Skype calls now support up to 100 participants. Learn more about making a Skype call.
Bug fixes and stability improvements. We've moved some bugs to a nice farm upstate and made some improvements.
The Microsoft Answers post lists different OS versions in two separate groups, but the changes for all versions of Skype are the same. Support for up to 100 participants in calls an...
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Skype update brings support for 100 participants in calls
After a few weeks of testing, Skype is rolling out a higher participant limit for calls to everyone. What you need to know Skype 8.66 is now available. The update brings support for up to 100 people in Skype calls. The update also…
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Syntax validiert (0 Fehler)
title: Detect Exploitation - Skype update brings support for 100 participants in calls
id: 22d78e3d-0221-407f-bc5d-e04043398ada
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
- https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-25
logsource:
category: network_connection
product: any
detection:
selection:
CommandLine|contains:
- 'exploit'
condition: selection
falsepositives:
- Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
- attack.initial_accessSyntax validiert (0 Fehler)
rule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-25"
description = "YARA Signature for "
strings:
$str = "Skype update brings support fo" ascii wide
condition:
any of them
}Syntax validiert (0 Fehler)
index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("Skype update brings support for 100 part")
| stats count earliest(_time) as first_seen latest(_time) as last_seen by src_ip, dest_ip, dest_host, signature
| eval first_seen=strftime(first_seen, "%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen, "%Y-%m-%d %H:%M:%S")
| sort - countSyntax validiert (0 Fehler)
message: "*Skype update brings support for 100 part*"Syntax validiert (0 Fehler)
CommonSecurityLog
| where Message has "Skype update brings support for 100 part"
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desc2. Cyber Threat Intelligence & Forensik
CTI Threat Relationship Graph2 Knoten / 1 Relationen
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Resource Development
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Initial Access
Execution
Persistence
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Privilege Escalation
Defense Evasion
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Discovery
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Collection
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Command and Control
Exfiltration
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Impact
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Fokus-Vektor:
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich Skype update brings support for 100 part.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
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