CVE-2026-117470
WebAuthn assertion replay permits second-factor bypass in Psono Server
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.
INFO
Published Date :
Oct. 27, 2026, 6:17 a.m.
Last Modified :
Oct. 27, 2026, 6:17 a.m.
Remotely Exploit :
Yes !
Source :
fdf66990-8419-4c8c-8848-ec15d75773b4
Affected Products
The following products are affected by CVE-2026-117470
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | fdf66990-8419-4c8c-8848-ec15d75773b4 | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update Psono Server to version 7.2.4 or later.
- Verify WebAuthn challenge consumption after login.
- Implement stricter WebAuthn assertion validation.
- Monitor for suspicious login attempts.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-117470.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-117470 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-117470
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-117470 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-117470 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by fdf66990-8419-4c8c-8848-ec15d75773b4
Oct. 27, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N Added CWE CWE-294 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/117xxx/CVE-2026-117470.json">CVE-2026-117470</a> Added Reference https://gitlab.com/esaqa/esaqa/security-advisories/-/blob/master/advisories/CVE-2026-117470.md Added Reference https://gitlab.com/esaqa/psono/psono-server Added Reference https://gitlab.com/esaqa/psono/psono-server/-/blob/v7.2.3/psono/restapi/serializers/webauthn_verify.py Added Reference https://gitlab.com/esaqa/psono/psono-server/-/commit/9c9a7f1701535df63370340dcc80210737dc495d Added Reference https://gitlab.com/esaqa/psono/psono-server/-/releases/v7.2.4