01 Record
CVE-2026-73420
NextAuth.js: Email normalizer validates the address before Unicode normalization, allowing a homoglyph @ bypass
CriticalPUBLISHEDCNA: GitHub_M
CNA base score9.1 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
02 Description
NextAuth.js: Email normalizer validates the address before Unicode normalization, allowing a homoglyph @ bypass
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 0.72% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 53.6% of scored records. A rank, not a probability.
- NVD base score
- 9.1 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/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
- NVD analysis status
- Awaiting Analysis. NVD last modified this record on 2026-09-18.
- 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.
04 Metadata
- Published
- 2026-08-13 22:04Z2 MO AGO
- Last updated
- 2026-08-14 15:06Z2 MO AGO
- Reserved
- 2026-08-12
- Assigning CNA
- GitHub_M
- Record state
- PUBLISHED
- Severity
- Critical (CVSS 9.1)
- CNA CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- Weaknesses
- CWE-180Incorrect Behavior Order: Validate Before CanonicalizeVariant
- Data version
- 5.2
- Document digest
- ab35c78c8b097e36b322a64b14716f4da0a4b5b1fdf0d35ad9fb449859854ac8
05 Affected products
06 References
- github.comhttps://github.com/nextauthjs/next-auth/security/advisories/GHSA-7rqj-j65f-68wh
- github.comhttps://github.com/nextauthjs/next-auth/commit/19d2feb24359fa8c79418907fc68d9ec8152ca94
- github.comhttps://github.com/nextauthjs/next-auth/commit/a63eee12a1a20cb35209e44195b097868517b9a0
- github.comhttps://github.com/nextauthjs/next-auth/releases/tag/@auth/core@0.41.3
- github.comhttps://github.com/nextauthjs/next-auth/releases/tag/next-auth@4.24.15
- github.comhttps://github.com/nextauthjs/next-auth/releases/tag/next-auth@5.0.0-beta.32