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CVE-2026-20833 is an information disclosure vulnerability in Windows Kerberos caused by continued use of weak or legacy cryptographic algorithms for Kerberos service ticket issuance, particularly RC4, for accounts that do not have explicit Active Directory encryption type settings. In affected environments, a domain controller may issue service tickets using weaker encryption types instead of stronger AES-based defaults. An authorized attacker can obtain such a weakly encrypted service ticket and perform offline cryptanalytic or password-recovery attacks against the ticket material to recover the associated service account password. Microsoft’s hardening guidance ties the issue to Kerberos Key Distribution Center behavior and changes the default DefaultDomainSupportedEncTypes handling so that accounts lacking an explicit msds-SupportedEncryptionTypes definition default to AES-SHA1 rather than permitting RC4-based issuance.
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No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability associated with the Kerberos protocol in Windows Server 2025 that is addressed by changing the default DefaultDomainSupportedEncTypes value to AES-SHA1 for accounts without explicit Active Directory encryption type definitions.
A vulnerability related to Kerberos KDC usage of RC4 for service account ticket issuance, addressed by changing default encryption behavior to leverage AES-SHA1 when explicit encryption types are not defined.
Kerberos認証に関する脆弱性。Microsoftは段階的にRC4を廃止することで影響低減/対処を進めるとしている（KBガイダンスあり）。
Windows Active Directory ドメイン コントローラーの Kerberos において、RC4 などのレガシ暗号で発行されたサービスチケットを攻撃者が入手できると、オフライン解析によりサービスアカウントのパスワード回復につながり得る情報漏えい/弱暗号起因の脆弱性。更新により既定の暗号スイートを AES-SHA1 のみに寄せ、段階的に強制(ブロック)へ移行する。
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.