CVE-2026-117470 WebAuthn assertion replay permits second-factor bypass in Psono Server
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-117470?
CVE-2026-117470 is a medium-severity vulnerability in esaqa GmbH Psono, published on 27 Oct 2026.
Official description
Psono Server CE & EE versions 3.1.0 through 7.2.3 did not consume a stored WebAuthn challenge after assertion verification. An unauthenticated remote attacker who possessed the user's password and one captured valid WebAuthn assertion could replay that assertion with separate login tokens while the stored challenge remained unchanged, bypassing the WebAuthn second factor. The attack required capture of a valid assertion and did not itself disclose plaintext secrets.
Weakness: CWE-294
Which versions are affected by CVE-2026-117470?
How do I fix CVE-2026-117470?
No fix has been published for CVE-2026-117470 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-117470 being exploited?
There is no known exploitation of CVE-2026-117470 in the wild and no public exploit code.
Sources
Also known as GHSA-3gq2-hx4p-69qc.