CVE-2026-78426

Logout bypass via alternate JWT spelling

LOW
3.7
CVSS Score
Published: September 17, 2026 at 09:28 AM UTC
Updated: September 28, 2026 at 01:17 PM UTC
2 products affected across 2 vendorsNeuvectorNeuVector

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Severity
LOW3.7
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

The 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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
v ≤ v5.6.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

2LOWsuse
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-863

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