Auth bypass in Microsoft 365 Apps
CVE-2023-21715
Microsoft Publisher Security Feature Bypass Vulnerability
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.120 (96.1th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.120 · newest: 0.120 · change: 0.000
Affected products
- Microsoft 365 Apps
- Microsoft 365 Apps For Enterprise — versions 16.0.1
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Public proof-of-concept exploits
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21715 (vendor-advisory, Patch, patch, Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2023-21715?
- CVE-2023-21715 is a high-severity vulnerability in Microsoft 365 Apps, classified under Incorrect Authorization. CVSS score: 7.3/10. Published 2023-02-14.
- How severe is CVE-2023-21715?
- High severity. CVSS v3 base score is 7.3 out of 10.
- Is CVE-2023-21715 known to be exploited?
- Yes. CVE-2023-21715 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-02-14), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.