WebAuthn assertion replay permits second-factor bypass in Psono Server

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-117470
StatePUBLISHED
Assigneresaqa
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-27 06:17:24 UTC
Updated2026-10-27 06:17:24 UTC
DescriptionPsono 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from fdf66990-8419-4c8c-8848-ec15d75773b4

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

Problem Types: CWE-294 | CWE-294 CWE-294 Authentication Bypass by Capture-replay

VersionSourceTypeScoreSeverityVector
3.1fdf66990-8419-4c8c-8848-ec15d75773b4Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
3.1CNACVSS6.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Esaqa GmbH Psono affected 3.1.0 7.2.4 semver Not specified

References

ReferenceSourceLinkTags
gitlab.com/esaqa/esaqa/security-advisories/-/blob/master/advisories/CVE-... fdf66990-8419-4c8c-8848-ec15d75773b4 gitlab.com
gitlab.com/esaqa/psono/psono-server/-/commit/9c9a7f1701535df63370340dcc8... fdf66990-8419-4c8c-8848-ec15d75773b4 gitlab.com
gitlab.com/esaqa/psono/psono-server/-/blob/v7.2.3/psono/restapi/serializ... fdf66990-8419-4c8c-8848-ec15d75773b4 gitlab.com
gitlab.com/esaqa/psono/psono-server fdf66990-8419-4c8c-8848-ec15d75773b4 gitlab.com
gitlab.com/esaqa/psono/psono-server/-/releases/v7.2.4 fdf66990-8419-4c8c-8848-ec15d75773b4 gitlab.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Ryan Chaplin (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-07-29T16:10:00.000ZVulnerability reported to vendor
CNA2026-07-30T07:49:00.000ZVendor fix implemented
CNA2026-07-30T13:16:00.000ZPsono Server CE & EE 7.2.4 released

Solutions

CNA: Upgrade to Psono Server 7.2.4 or later.

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