CVE-2026-89320 — Vulnerability intelligence
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Published:
- CVSS
- 8.8
- CISA KEV
- Not listed; not proof of no exploitation
Original source text (not a translation)
`HmacShaCryptor.Hash` never hashed its input. For any input it returned `HMAC_K("")` — the MAC of the empty message under the key. Every AES-CBC-HMAC JWE produced or verified by gose therefore carried an authentication tag that is constant per key and independent of the message, removing ciphertext integrity entirely.