CVE-2026-78426 json
Logout bypass via alternate JWT spelling
published last mo. modified last mo. also EUVD-2026-81414 , GHSA-wcx5-mq6c-c54j
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository neuvector/neuvector. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- 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
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- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- last mo.
Exploit prediction
0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-11).
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, advisory
-
bugzilla.suse.com
/show_bug.cgi?id=CVE-2026-78426
issue-tracking
Sources
- CVE List CVE-2026-78426
- NVD CVE-2026-78426
- Maintainer advisory GHSA-wcx5-mq6c-c54j
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of neuvector/neuvector published their own advisory on GitHub. Reviewed sources take precedence over it.