CVE-2026-71206 shiori - JWT CheckToken Never Re-Validates Account State, Allowing Stale-Privilege Access After Deletion or Demotion
Attackers retain access using stale JWTs after account deletion or demotion because Shiori fails to re-validate account state against the database.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-71206?
CVE-2026-71206 is a high-severity authentication bypass vulnerability in go-shiori shiori, published on 5 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Shiori's CheckToken function (internal/domains/auth.go) validates only the JWT's HMAC signature and returns the embedded claims.Account object unmodified, never re-fetching the account from the database. No session store or token-revocation mechanism exists in the codebase.
Weakness: CWE-613
Which versions are affected by CVE-2026-71206?
How do I fix CVE-2026-71206?
No fix has been published for CVE-2026-71206 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-71206 being exploited?
There is no known exploitation of CVE-2026-71206 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-m8xp-ww9g-3j6j.