In the era of hybrid work and cloud-first strategies, Microsoft 365 (M365) has become more than just a productivity suite — it’s the nerve centre of operations. In the Asia-Pacific (APAC) region, 68% of organisations rely on M365 as their primary SaaS environment, ahead of Google Workspace and Salesforce. That makes it a critical crown jewel — and a prime target.
However, dominance breeds danger. According to the Asia-Pacific’s State of Cloud Security 2025, 35% of organisations suffered a breach in the past six months, and a startling 72% admit their tools leave blind spots. Only around one in three security leaders feel “very confident” in their cloud security posture.
Let’s explore why M365 has become the frontline in SaaS attacks — and what every organisation must do now to defend it.
SaaS Adoption: M365 Leads the Pack
Microsoft 365 touches everything: Outlook, Teams, SharePoint, OneDrive, calendar data, document collaboration. It’s woven into the business fabric. But that also makes it an attractive attack surface.
Unlike on-premises systems, SaaS platforms operate beyond the immediate control of your data centre. Files, emails, identities all roam the cloud. That mobility is convenient — but it also magnifies risk.
With M365 so deeply embedded, attackers view it as a lucrative point of entry. The more dependent your organisation is on M365, the greater the potential fallout from even a single compromised account.
The Top Threats Facing M365
The APAC report identifies several SaaS risks — but in M365, these are especially acute.
1. Hijacked Accounts (72%)
Credential-based attacks are the easiest route inside. Through phishing, credential stuffing, or brute-force attacks, adversaries compromise accounts and gain lateral access. Once inside, they can impersonate executives, send malicious emails, or exfiltrate data.
- Microsoft reports that over 99% of identity attacks involve compromised credentials, and the company blocks an average of 7,000 password attacks per second.
- A survey across 27 million M365 users found 71.4% suffer at least one compromised account per month.
These numbers reflect the extreme pressure on the need for active protection.
2. Misconfigurations (66%)
Security often fails not because of hackers, but because of human oversight. The report reveals that only 9% of organisations perform continuous configuration checks, while 65% do so monthly or less. Misconfigured sharing settings, open SharePoint sites, or permissive admin roles create vulnerabilities that attackers can easily exploit.
3. Accidental Data Leaks (62%)
Employees remain a major weak link. Many unintentionally expose confidential data by sharing files externally or connecting unauthorised third-party apps. The combination of convenience features and limited user awareness leads to unintentional exposure of sensitive documents, contact lists, or credentials.
Shared Responsibility Confusion
One of the most misunderstood aspects of SaaS security is the shared responsibility model. The report notes that many organisations wrongly assume that because Microsoft hosts the infrastructure, it also secures everything within the environment.
That’s a dangerous misconception.
Here’s the truth:
- Microsoft secures the platform itself — the physical servers, network, and uptime.
- You, the customer, are responsible for your data, users, and configurations.
If an attacker steals a password or an employee shares a confidential document publicly, Microsoft isn’t liable — your organisation is. This misunderstanding leads to dangerous blind spots where threats go unnoticed until it’s too late.
Building resilience means recognising this shared model and actively securing the parts that you control: identity management, configurations, and user activity.
Real-World Attack Trends That Hit Home
The UK’s National Cyber Security Centre (NCSC) recently issued a warning about Russian state-linked actors (Fancy Bear / APT28) targeting M365 accounts via Auth token phishing and fake login prompts.
Globally, Microsoft customers face more than 600 million cyber attacks daily, including identity, ransomware, phishing, and supply chain methods.
Sophisticated insider abuse and misconfigured admin privileges remain a chronic risk. A survey cited in a whitepaper showed instances where IT administrators abused privileges— highlighting why continuous monitoring of privileged accounts is essential to detect unusual or suspicious behaviour early.
These are not edge cases: they are very much part of the shifting threat landscape.
The path forward is to simplify security operations:
The Cost of a SaaS Breach
A single M365 breach can have devastating consequences.
- Data theft: Sensitive data like contracts, emails, and intellectual property are prime targets.
- Operational disruption: Hijacked accounts can lock out legitimate users or spread phishing campaigns internally.
- Regulatory penalties: Exposure of personal or customer data may trigger fines under privacy laws such as GDPR or regional frameworks.
- Reputational damage: Clients and partners lose trust quickly after a cloud-based data leak.
The report reveals that 35% of organisations in APAC experienced a data breach within the last six months — a staggering figure that underscores the growing urgency to secure M365 environments.
These breaches aren’t isolated incidents; they’re symptoms of a growing threat landscape that exploits poor visibility and mismanagement of SaaS applications.
How to Secure Microsoft 365 Effectively
The good news is that Microsoft 365 offers a rich security foundation — but it needs to be actively managed, monitored, and enhanced. Based on the findings of the report, organisations should focus on the following key areas:
1. Monitor User and Data Activity
- Continuously track file sharing and collaboration patterns in OneDrive and SharePoint.
- Set alerts for unusual behaviour such as large file downloads, external sharing spikes, or logins from unfamiliar locations.
- Leverage User and Entity Behaviour Analytics (UEBA) to detect compromised or malicious insiders.
2. Automate Misconfiguration Detection
The report found that 29% of organisations resolve configuration issues within a day, but 6% take over a month. Delays of that length give attackers ample opportunity to exploit vulnerabilities.
Regularly audit:
- SharePoint and OneDrive permissions.
- Admin role assignments.
- Third-party app access requests.
Automate detection and remediation wherever possible to reduce manual workload and response times.
3. Empower Employees with Security Awareness
Human error accounts for a significant portion of SaaS security incidents. Regularly train employees on:
- Recognising phishing attempts and suspicious login prompts.
- Safe sharing practices within M365 tools.
- The risks of connecting unauthorised applications or browser plugins.
An aware workforce is one of the most powerful defences against SaaS breaches.
Investing in SaaS Security
The APAC region is responding to these challenges with increased investment. The report notes that 41% of organisations plan to expand their budgets for SaaS cybersecurity over the next few years..
This investment is focused on improving:
- Account protection and identity management.
- Real-time threat monitoring and automation.
- Misconfiguration detection and policy enforcement.
For many, this shift represents a recognition that SaaS isn’t “set and forget” — it’s an evolving environment that requires continuous attention and smart tooling.
From Exposure to Resilience
Microsoft 365 has redefined how organisations in APAC collaborate, communicate, and store data. But it has also redefined the threat surface. Account hijacks, misconfigurations, and accidental leaks are no longer edge cases — they are daily realities.
Resilience begins with visibility and vigilance. Organisations must own their part of the shared responsibility model, proactively monitor SaaS activity, and automate wherever possible.
By doing so, they can ensure that the same platforms driving business productivity don’t become the source of the next data breach headline.
Your SaaS apps are the front door to your business. It’s time to make sure that door is locked, monitored, and always under your control.
Download the Full Report
This blog only scratches the surface of the insight within the Asia-Pacific’s State of Cloud Security 2025. For deeper analysis, benchmarks, and a full set of recommendations to harden your cloud security, download the full report now.
