CVE-2026-89320Published
HmacShaCryptor.Hash never hashes its input — returns constant HMAC_K("") for all inputs, voiding CBC-HMAC JWE integrity
Explicit identifiers and source references
These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.
CVE-2026-89320 · Microsoft / collected KEV context
cve-program · CVE-2026-89320
Related operational evidence
Explicit CVE identifiers- HmacShaCryptor.Hash never hashes its input — returns constant HMAC_K("") for all inputs, voiding CBC-HMAC JWE integrity · Newly collected advisory · 23 Oct 2026