[NEW] [high] Microsoft Office 365 (Moodle Plugin): Vulnerability allows bypassing of security measures

highCVE-2026-54733

A remote, anonymous attacker can exploit a vulnerability in Microsoft Office 365 (Moodle Plugin) to bypass security measures, impersonate users, and thereby gain elevated permissions, including administrator access.

CSIRTS triage

vendor: Microsoft product: Office 365 (Moodle Plugin)Authentication bypass

What: A vulnerability allows a remote, anonymous attacker to bypass security measures and impersonate users.
Who is affected: Deployments of Microsoft Office 365 with the Moodle Plugin.
Urgency: Remediation is urgent due to the high severity and potential for elevated permissions, including administrator access.
Action: Apply the latest security updates to the Moodle Plugin.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-07-17
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2400

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-547330.92% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 57% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-54733	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownCVE-2026-54733: The Microsoft 365 and Microsoft Entra ID Plugins for Moodle provide Office 365 and Azure Activ…nvd

Recent advisories for Microsoft Office

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

critical[NEW] [critical] Microsoft Office products: Multiple vulnerabilitiescert-bund · 2026-07-23
unknownexploitedNCSC-2026-0237 [1.02] [H/H] Vulnerabilities Fixed in Microsoft Officencsc-nl · 2026-07-21
unknownexploitedNCSC-2026-0237 [1.01] [H/H] Vulnerabilities fixed in Microsoft Officencsc-nl · 2026-07-17
mediumCVE-2026-62826: Improper neutralization of input during web page generation ('cross-site scripting') in Micros…nvd · 2026-07-16
unknownCVE-2026-54733: The Microsoft 365 and Microsoft Entra ID Plugins for Moodle provide Office 365 and Azure Activ…nvd · 2026-07-16
unknownMultiple vulnerabilities in Microsoft Office (July 15, 2026)cert-fr-avis · 2026-07-15