04 Affected products
PAIRS: —
01 RecordSTATE: PUBLISHED
02 Description
CNA: GitHub_MBrowser Server WebSocket origin validation bypass via unanchored regex (patch bypass of CVE-2026-40289 / GHSA-8x8f-54wf-vv92)
03 Exploitation and scoring
SRC: CISA, FIRST, NVD, RED HAT- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- Not scored by EPSS
- EPSS percentile
- Not scored by EPSS
- NVD base score
- The NVD has published no score for this record
- NVD CVSS vector
- No NVD score to derive
- NVD analysis status
- Not recorded
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
SCHEMA: 5.2
- Published
- 2026-08-25 15:21Z42 MIN AGO
- Last updated
- 2026-08-25 15:21Z42 MIN AGO
- Reserved
- 2026-06-16
- Assigning CNA
- GitHub_M
- Record state
- PUBLISHED
- Severity
- Critical (CVSS 9.1)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weaknesses
- CWE-284Improper Access ControlPillar
- CWE-625Permissive Regular ExpressionBase
- Data version
- 5.2
- Document digest
- 7e709840b4eb9efc26aaac3502237174fcd13f01d7b8aa935b4dcf812c2b12b3
05 Affected products
PAIRS: 1VendorProductVersionsPlatforms