Is there a public exploit for CVE-2026-89320?

No public exploit for CVE-2026-89320 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-89320?

CVE-2026-89320 scores CVSS 8.8 (v4.0), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.17%.

What does CVE-2026-89320 affect?

CVE-2026-89320 affects Eclipse Foundation Eclipse KeyPont - GOSE.

8.8 High

HmacShaCryptor.Hash never hashed its input.

CVE-2026-89320

HmacShaCryptor.Hash never hashed its input. For any input it returned HMACK("") — 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.

Assessment

CVSS: 8.8 (v4.0)
Severity: High
EPSS: 0.17% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 23 October 2026
Last updated: 2 November 2026
Affected: Eclipse Foundation · Eclipse KeyPont - GOSE
Assigner: eclipse

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

https://github.com/eclipse-keypont/gose/security/advisories/GHSA-h6w5-722x-2h3m

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