Logout bypass via alternate JWT spelling

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-78426
StatePUBLISHED
Assignersuse
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 10:17:03 UTC
Updated2026-09-28 13:17:22 UTC
DescriptionThe NeuVector JWT verifier accepts noncanonical Base64URL encodings of the same RSA signature field. An attacker holding a valid JWT that has not expired, but was logged out of NeuVector, can continue using the non-expired token with equivalent spelling of the RSA signature field until the token validity expires.

Risk And Classification

Primary CVSS: v4.0 2 LOW from [email protected]

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.001160000 probability, percentile 0.018480000 (date 2026-09-21)

Problem Types: CWE-863 | CWE-863 CWE-863 Incorrect Authorization

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary2LOWCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS2LOWCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
Low
User Interaction
Active
Confidentiality
Low
Integrity
Low
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA SUSE Neuvector affected v5.6.1 custom Not specified

References

ReferenceSourceLinkTags
github.com/neuvector/neuvector/security/advisories/GHSA-wcx5-mq6c-c54j [email protected] github.com
bugzilla.suse.com/show_bug.cgi [email protected] bugzilla.suse.com
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