CVE-2026-54983
HighCVSS 7.5Exploitation Probability (EPSS)
Elevated risk52th percentile - higher than 52% of all known CVEs
Summary
A stack-based buffer overflow vulnerability in Active Directory Federation Services (AD FS) allows an unauthorized attacker to remotely execute code or cause a denial of service (DoS) by sending a specially crafted network request.
Risk Assessment
An attacker can remotely crash the AD FS service, preventing authentication and authorization across the organization, leading to service outages for applications and resources.
Recommendation
Apply the security update provided by the vendor for AD FS immediately and restrict network access to the service to trusted hosts only.
Other vulnerabilities in Active Directory Federation Services
See all- CVE-2026-56155HighActively exploited
Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.
- CVE-2026-97788High
Observable discrepancy in Active Directory Federation Services (AD FS) allows an unauthorized attacker to disclose information over a network.
- CVE-2026-96222High
A vulnerability in Active Directory Federation Services (AD FS) related to improper certificate validation allows an unauthorized attacker to perform spoofing over a network.
- CVE-2026-83674High
Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
- CVE-2026-83645High
Allocation of resources without limits or throttling in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.
- CVE-2026-83511High
Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
- CVE-2026-70005Medium
Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to bypass a security feature over a network.
- CVE-2026-69982Medium
Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to bypass a security feature over a network.
- CVE-2026-108131High
A vulnerability in Active Directory Federation Services (AD FS) with no CWE assigned allows an unauthorized attacker to perform spoofing over a network.
- CVE-2026-103576Medium
URL redirection to untrusted site ('open redirect') in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network. An attacker can lure a user to a malicious address.
Original NVD description (English source)
Stack-based buffer overflow in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS