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Microsoft 365 device-code phishing in French-speaking Switzerland (November 2026)

campaign · campaign:m365-device-code-phishing-romandie-2026-11 single-source

Device-code phishing campaign against Microsoft 365 accounts that the canton of Vaud warned of on 2026-11-04 as running in French-speaking Switzerland with several organisations already affected: mail posing as a company or known contact leads to a workers.dev page and a code entry on a genuine Microsoft sign-in page; the notice names no actor, kit or count.

Aliases: Vaud Microsoft 365 device-code phishing warning

Coverage
1
first 2026-11-05 → last 2026-11-05
Latest activity
2026-11-05
Vaud: device-code phishing against Microsoft 365 is running in Romandie; several organisations already…
Peak priority
high
1 high
Targets
·
regions: switzerland
Sources cited
4
3 hosts

Action items (1)

Do-now tasks recorded on the entries about Microsoft 365 device-code phishing in French-speaking Switzerland (November 2026), newest first. Check the date before acting on an older one.

  • In every Microsoft 365 tenant your organisation runs or administers, audit device code sign-ins with the authentication protocol filter of the sign-in logs and, where no documented device needs the flow, create a Conditional Access policy with the Authentication flows condition set to Device code flow and Block access, starting in report-only mode and excluding emergency-access accounts and, where devices register through it, the Device Registration Service.
    2026-11-05Vaud: device-code phishing against Microsoft 365 is…

Defender insights

What each entry about Microsoft 365 device-code phishing in French-speaking Switzerland (November 2026) tells a defender to do, newest first.

2026-11-05HIGHVaud: device-code phishing against Microsoft 365 is running in Romandie; several organisations already affected

Exposure · triage · detection

Relationships explore in graph

Typed, source-stated connections from the entity registry; each edge cites the entry whose reporting establishes it.

affects

Story timeline

  1. 2026-11-05Canton Vaud warns of a device-code phishing campaign against Microsoft 365 accounts running in French-speaking Switzerland, with several organisations already affected
    active-threatsVaud: device-code phishing against Microsoft 365 is running in Romandie; several organisations already affected

Hunting pivots

ATT&CK techniques (3 across 5 tactics)

3 techniques observed across 1 entry about this entity, derived from entry metadata and body evidence, never asserted without a published entry behind it · pinned to MITRE ATT&CK v20.0 · compare on the matrix · Navigator layer (JSON)

  • Initial AccessValid Accounts: Cloud Accounts · Phishing: Spearphishing Link
  • PersistenceValid Accounts: Cloud Accounts
  • Privilege EscalationValid Accounts: Cloud Accounts
  • StealthValid Accounts: Cloud Accounts
  • Credential AccessSteal Application Access Token

Initial Access TA0001

T1078.004Valid Accounts: Cloud Accounts×1

Valid accounts in cloud environments may allow adversaries to perform actions to achieve Initial Access, Persistence, Privilege Escalation, or Defense Evasion. Cloud accounts are those created and configured by an organization for use by users, remote support, services, or for administration of resources within a cloud service provider or SaaS application. Cloud Accounts can exist solely in the cloud; alternatively, they may be hybrid-joined between on-premises systems and the cloud through syncing or federation with other identity sources such as Windows Active Directory.

Evidence: 2026-11-05/vaud-m365-device-code-phishing-campaign-romandie · ATT&CK page ↗

T1566.002Phishing: Spearphishing Link×1

Adversaries may send spearphishing emails with a malicious link in an attempt to gain access to victim systems. Spearphishing with a link is a specific variant of spearphishing. It is different from other forms of spearphishing in that it employs the use of links to download malware contained in email, instead of attaching malicious files to the email itself, to avoid defenses that may inspect email attachments. Spearphishing may also involve social engineering techniques, such as posing as a trusted source.

Evidence: 2026-11-05/vaud-m365-device-code-phishing-campaign-romandie · ATT&CK page ↗

Persistence TA0003

T1078.004Valid Accounts: Cloud Accounts×1

Valid accounts in cloud environments may allow adversaries to perform actions to achieve Initial Access, Persistence, Privilege Escalation, or Defense Evasion. Cloud accounts are those created and configured by an organization for use by users, remote support, services, or for administration of resources within a cloud service provider or SaaS application. Cloud Accounts can exist solely in the cloud; alternatively, they may be hybrid-joined between on-premises systems and the cloud through syncing or federation with other identity sources such as Windows Active Directory.

Evidence: 2026-11-05/vaud-m365-device-code-phishing-campaign-romandie · ATT&CK page ↗

Privilege Escalation TA0004

T1078.004Valid Accounts: Cloud Accounts×1

Valid accounts in cloud environments may allow adversaries to perform actions to achieve Initial Access, Persistence, Privilege Escalation, or Defense Evasion. Cloud accounts are those created and configured by an organization for use by users, remote support, services, or for administration of resources within a cloud service provider or SaaS application. Cloud Accounts can exist solely in the cloud; alternatively, they may be hybrid-joined between on-premises systems and the cloud through syncing or federation with other identity sources such as Windows Active Directory.

Evidence: 2026-11-05/vaud-m365-device-code-phishing-campaign-romandie · ATT&CK page ↗

Stealth TA0005

T1078.004Valid Accounts: Cloud Accounts×1

Valid accounts in cloud environments may allow adversaries to perform actions to achieve Initial Access, Persistence, Privilege Escalation, or Defense Evasion. Cloud accounts are those created and configured by an organization for use by users, remote support, services, or for administration of resources within a cloud service provider or SaaS application. Cloud Accounts can exist solely in the cloud; alternatively, they may be hybrid-joined between on-premises systems and the cloud through syncing or federation with other identity sources such as Windows Active Directory.

Evidence: 2026-11-05/vaud-m365-device-code-phishing-campaign-romandie · ATT&CK page ↗

Credential Access TA0006

T1528Steal Application Access Token×1

Adversaries can steal application access tokens as a means of acquiring credentials to access remote systems and resources.

Evidence: 2026-11-05/vaud-m365-device-code-phishing-campaign-romandie · ATT&CK page ↗

Entries about Microsoft 365 device-code phishing in French-speaking Switzerland (November 2026) (1)

2026-11-05 · view entry permalink →

HIGHNATOA2

Canton Vaud warns of a device-code phishing campaign against Microsoft 365 accounts running in French-speaking Switzerland, with several organisations already affected

The canton of Vaud said on 2026-11-04 that a phishing campaign is currently running in French-speaking Switzerland and that several organisations have already been affected (translated from French) (Canton of Vaud, 2026-11-04). The messages can appear to come from a company or a known contact and invite the reader to view an invoice, open a document or verify information through a link; the campaign uses device-code phishing, which gets the victim to type a code on a genuine Microsoft authentication page and so gives the attackers fraudulent access to the Microsoft 365 account (Canton of Vaud, 2026-11-04). The links printed in the notice combine a company-style name and a portal word on a workers.dev subdomain whose second label starts with a cloud-storage word and an identifier, and the canton says other addresses can be used too (Canton of Vaud, 2026-11-04); workers.dev is the route assigned to every Cloudflare Worker (Cloudflare Docs, 2026-09-22). The notice names no actor, kit, count of organisations, sector or start date.

Triage: Microsoft documents device code sign-in for shared devices and signage; a device-code sign-in by a user who has no such device, soon after that user received a mailed link, falls outside that use (Microsoft Learn, 2026-03-24).

A phishing campaign is currently running in French-speaking Switzerland. Several organisations have already been affected.

This campaign uses a technique called Device Code Phishing. It consists of getting you to enter a code on a legitimate Microsoft authentication page.

Canton of Vaud

Builds on: FBI PSA260521, Kali365 OAuth device-code PhaaS bypasses M365 MFA without credential capture · Huntress: stolen post-MFA M365 tokens replayed within minutes; a password reset leaves planted…

threat05 Nov 03:56Zsingle-sourceOpen finding →

Co-occurring entities

Derived: referenced by the same focused operational entries (weekly summaries and report roundups don't count); ×N counts the shared entries.

Where this entity is cited

  • Threats1

Source distribution

  • learn.microsoft.com2 (50%)
  • developers.cloudflare.com1 (25%)
  • vd.ch1 (25%)