CVE-2026-78426Network attack vectorHinoki check available

Logout bypass via noncanonical JWT signature encoding

Published Sep 17, 2026 · Updated Sep 28, 2026

Logout bypass in SUSE NeuVector 5.6.1 allows remote authenticated users to reuse logged-out JWTs through network requests. The JWT verifier accepts distinct, noncanonical Base64URL encodings of the same RSA signature instead of requiring a unique compact token serialization. Exploitation requires possession of a valid JWT before logout; access retains that user's privileges only until the token expires.

CVSS severity3.7
Low
EPSS probability0.19%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Logout bypass in SUSE NeuVector 5.6.1 allows remote authenticated users to reuse logged-out JWTs through network requests. The JWT verifier accepts distinct, noncanonical Base64URL encodings of the same RSA signature instead of requiring a unique compact token serialization. Exploitation requires possession of a valid JWT before logout; access retains that user's privileges only until the token expires.

The record

CVE
CVE-2026-78426
Published
Sep 17, 2026
Updated
Sep 28, 2026
Vendor
SUSE
Product
NeuVector
Classifications
CWE-863, T1550.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=v5.6.1 changes=[{"at":"5.6.2","status":"unaffected"},{"at":"5.5.4","status":"unaffected"},{"at":"5.4.11","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SUSE · NeuVectorversion=0 <=v5.6.1 changes=[{"at":"5.6.2","status":"unaffected"},{"at":"5.5.4","status":"unaffected"},{"at":"5.4.11","status":"unaffected"}]

Published CVSS scores

3.7SUSECVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1550.001Use Alternate Authentication Material: Application Access Token

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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