CVE-2026-78426 json
Logout bypass via alternate JWT spelling
published 2026-09-17 52 d ago modified 2026-09-28 41 d ago also EUVD-2026-81414
- cvss
- 2.0
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 8%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- SUSE neuvector 5.4.11, 5.5.4, 5.6.2
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 52 d ago
Exploit prediction
0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 2.0 | 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 |
| CNA | 4.0 | 2.0 | 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 |
Affected products
- SUSE neuvector
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
github.com
/neuvector/neuvector/security/advisories/GHSA-wcx5-mq6c-c54j
vendor-advisory
-
bugzilla.suse.com
/show_bug.cgi?id=CVE-2026-78426
issue-tracking
Sources
- CVE List CVE-2026-78426
- NVD CVE-2026-78426
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