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CVE-2023-27490

26
FAUCET Score

CVE-2023-27490 describes an authentication vulnerability in NextAuth.js versions prior to 4.20.1, affecting applications using OAuth providers. An attacker could intercept and manipulate the authorization URL to log in as a victim, bypassing CSRF protection, due to a partial failure in OAuth session code generation. This vulnerability carries a high CVSS score of 8.8, indicating a network-based attack with low complexity, requiring user interaction, and leading to high confidentiality, integrity, and availability impacts. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.20.1CPE matchmatch criteria
cpe:2.3:a:nextauth.js:next-auth:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.54%
Probability of exploitation in next 30 days
EPSS Percentile
42.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0054 is in the 44th percentile among its peer group of 14,848 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

npmpatch availablevia ghsa
Product: next-authFixed in: 4.20.1
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

npmGHSA-7r7x-4c4q-c4qfhigh

Missing proper state, nonce and PKCE checks for OAuth authentication

Mar 13, 2023

References

authjs.dev / reference/core/providers
Product
danielfett.de / 2020/05/16/pkce-vs-nonce-equivalent-or-not
Not Applicable
github.com / nextauthjs/next-auth/security/advisories/GHSA-7r7x-4c4q-c4qf
ExploitVendor Advisory
next-auth.js.org / configuration/initialization
Product
next-auth.js.org / configuration/providers/oauth
Product
security.netapp.com / advisory/ntap-20230420-0006
rfc-editor.org / rfc/rfc6749
Not Applicable