CVE-2026-83645
HighCVSS 7.5Exploitation Probability (EPSS)
Elevated risk69th percentile - higher than 69% of all known CVEs
Summary
Allocation of resources without limits or throttling in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.
Risk Assessment
Risk of resource exhaustion leading to unavailability of federation services and authentication systems.
Recommendation
Install the latest security updates for AD FS and configure resource limits and monitoring.
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-2026-83511High
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.
- CVE-2026-72978Medium
Allocation of resources without limits or throttling in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.
Original NVD description (English source)
Allocation of resources without limits or throttling 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