Josh M. Bryant retweeted
I was talking to @ZackKorman about this, and I think part of the disconnect is that people are picturing two different types of companies traditional enterprises and modern, cloud native startups.
Traditional enterprises often put workloads behind DMZs, internal networks, or segmented cloud environments, limiting what’s directly reachable. In that setup, phishing and credential spraying can be especially valuable ways in.
Compare that with a startup built around internet-facing apps, APIs, and SaaS integrations. There can be a much broader surface to attack directly.
Both can run on AWS or GCP. The distinction is what’s exposed and how access is controlled. That changes which attack paths are useful.
That also matters when people talk about attacker “swarms.” An EDR can isolate a workstation or kill the processes supporting an attacker’s access. If that workstation was their only foothold, adding more agents doesn’t magically restore access to that network segment.
Detection is only part of the picture. Companies can also restrict outbound communications through egress filtering, enforced proxies, or always on VPN and secure web gateway configurations. Those controls can block or disrupt the communications an attacker needs to maintain access.
Even stealing NTDS.dit doesn’t guarantee a path back in. Depending on the access path, the attacker may still have to contend with MFA, conditional access, segmentation, and other controls. More agents can accelerate attempts, but they still need a viable route in.
nitter.cf/HackingLZ/status/21191…
The cage analogy falls apart when defenders built the cage and control the doors, lights, and layout. Segmentation, IAM, least privilege, and monitoring all matter. More attackers increase the pressure they don’t erase the defender’s control of the environment.
nitter.cf/MTSlive/status/2118864…
Josh M. Bryant retweeted
Here’s the thing about agentic attacks - the current incarnation won’t score on you with some l33t zero day…but they will check every possible “door handle” to see which one you forgot to lock
How many red team assessments has your organization gotten where they searched some internal knowledge repository/file share…etc and found reams of creds/secrets/tokens…and your organizational response was a collective shrug 🤷♂️ and nothing got fixed/improved to prevent it from happening again?
Agentic attack often target the security tech debt of every organization that has always been there - but just hasn’t been abused by an external attacker yet
Josh M. Bryant retweeted
TIL: Microsoft Copilot keeps conversation history and personalization memory, stored in the user’s Exchange mailbox, so retention and eDiscovery apply.
Prompt history, data artifacts, and memory data are stored in hidden folders in the user's Exchange online mailbox, similar to Teams messages.
This means that an attacker with full access to mailboxes can pull this information.
techcommunity.microsoft.com/…
Josh M. Bryant retweeted
ICYMI, VulnCheck’s PHP2Shell exploit bypasses ASLR to achieve RCE on x86-64 systems with PHP’s recommended production configuration.
Jessica Lyons at The Register covers our research and why patching remains urgent: theregister.com/security/202…
Josh M. Bryant retweeted
Microsoft: October Windows Server updates break Exchange sign-in, mail flow
bleepingcomputer.com/news/mi…
bleepingcomputer.com/news/mi…
Josh M. Bryant retweeted
Exchange servers may become unstable after installation of October 2026 Windows updates techcommunity.microsoft.com/…
Josh M. Bryant retweeted
EWS Deprecation Is Here – What This Means To You techcommunity.microsoft.com/…
Josh M. Bryant retweeted
AI vs Security Basics? Alien vs Predator? medium.com/anton-on-security…
Josh M. Bryant retweeted
Link to blogpost with more tricks : intigriti.com/researchers/bl…
Josh M. Bryant retweeted
Released: August 2026 Exchange Server Security Update (SU)
techcommunity.microsoft.com/…
As expected, this SU disables OWA Light.
#MSExchange #Security
✈️ blog to kick off BH/DC week: Borrowing Windows Hello keys for authentication and persistence. dirkjanm.io/borrowing-window…
Josh M. Bryant retweeted
Russian threat actor Midnight Blizzard is conducting widespread traffic manipulation attacks at hotels worldwide. Result: delivering malware or redirecting auth flows at their discretion, globally.
Since early May 2026, we saw this subcluster manipulate DNS and HTTP traffic from networks served by captive portals to redirect user traffic through actor-controlled infrastructure. We’re calling the campaign CaptiveCrunch.
“We have observed notable commonalities in the equipment and management systems used across multiple affected networks.”
We break down the malware & techniques, but the most important part is how dynamic all of it is: Midnight Blizzard is using AI to support a significant portion of these operations. They are moving and changing quickly.
Feedback welcome on the suggested mitigations: microsoft.com/en-us/security…
Help spread the word to VIPs in governments, diplomatic entities, non-governmental organizations (NGOs) in the US and Europe (probably also those traveling to Black Hat)
Josh M. Bryant retweeted
Exchange Web Services (EWS) is approaching end of service in Exchange Online and will be disabled starting in October 2026, with a complete shutdown in mid-2027. This is Exchange Online only--no changes to EWS in Exchange Server.
#EWS #ExchangeOnline
techcommunity.microsoft.com/…
Josh M. Bryant retweeted
Just published a deep dive on the "Identity Onion"... the nesting doll of permissions required to make an AI Agent work (User Context vs. Machine Context, Body vs. Brain vs. Hands).
Read the full article here: graphnai.com/blog/ai-identit…
Josh M. Bryant retweeted
ICYMI: Timeline for SMTP AUTH w/Basic Authentication retirement updated:
✅ End of Dec2026: Disabled existing tenants, w/option to enable.
✅ Jan2027: Unavailable for new tenants.
✅ Mid2027: Final EOL date announcement
See techcommunity.microsoft.com/…
Josh M. Bryant retweeted
PSA: To avoid mail flow disruption between your organization and Exchange Online, organizations must ensure that their servers and clients trust the DigiCert Global Root G2 Certificate Authority and its subordinate CAs before April 30, 2026.
techcommunity.microsoft.com/…
#MSExchange
Josh M. Bryant retweeted
Update: Based on customer feedback, Microsoft has moved the date for this change to the end of June 2026.
Starting March 1, 2026, Microsoft will block EWS access to Exchange Online mailboxes that don't have license rights for EWS, namely, Exchange Online Kiosk, Microsoft 365/Office 365 F1, and Microsoft 365/Office 365 F3.
techcommunity.microsoft.com/…
#MSExchange #EWS #Licensing
Josh M. Bryant retweeted
Good article from Bleeping Computer about the Exchange hybrid tradecraft I dropped at Black Hat yesterday, with some of my comments on the techniques: bleepingcomputer.com/news/se…
Josh M. Bryant retweeted
CRITICAL: Microsoft Releases Guidance on High-Severity Vulnerability (CVE-2025-53786) in Exchange Hybrid Deployments!
The Cybersecurity and Infrastructure Security Agency (CISA) issues an Emergency Directive (ED 25-02), as exploitation could lead to complete identity takeover across an organization's cloud and on-premises environments.
Attackers can use this vulnerability to escalate privileges in the Exchange Online cloud environment. This risk arises because Exchange Server and Exchange Online share the same service principal in hybrid configurations. This could allow an attacker with administrative access to an on-premises server to gain undetected access to the cloud environment.
While Microsoft says no exploit has been observed in the wild, CISA warns that the impact could be significant. Failure to address this vulnerability could compromise the identity integrity of an organization's Exchange Online (Microsoft 365) service.
CVE-2025-53786 (Microsoft):
msrc.microsoft.com/update-gu…
CISA:
cisa.gov/news-events/alerts/…
CISA Emergency Directive (ED 25-02):
cisa.gov/news-events/directi…
#ExchangeServer #ExchangeOnline #CISA #Cybersecurity #Microsoft365 #PowerShell
Josh M. Bryant retweeted
Breaking News! Announcing Exchange 2016 / 2019 Extended Security Update (ESU) program!
Note this is not extended support; it's extended security updates for 6 months.
techcommunity.microsoft.com/…
#MSExchange #ESU #Announcement



















