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CVE-2023-31999

24
FAUCET Score

CVE-2023-31999 affects all versions of @fastify/oauth2, stemming from the use of a statically generated OAuth2 state parameter across all requests and users, which fails to prevent Cross-Site Request Forgery (CSRF) attacks as intended. This vulnerability carries a high severity CVSS score of 8.8, indicating it can be exploited remotely with low attack complexity, potentially leading to high impact on confidentiality, integrity, and availability if a user interacts with a malicious link. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 7.2.0CPE matchmatch criteria
cpe:2.3:a:fastify:oauth2:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.70%
Probability of exploitation in next 30 days
EPSS Percentile
49.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0070 is in the 51st percentile among its peer group of 14,855 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: @fastify/oauth2Fixed in: 7.2.0
redhatno patchvia redhat_api
Product: Red Hat OpenShift Dev SpacesFixed in: devspaces/dashboard-rhel8

Vendor Advisories (2)

npmGHSA-g8x5-p9qc-cf95high

@fastify/oauth2 vulnerable to Cross Site Request Forgery due to reused Oauth2 state

Jul 5, 2023
redhatCVE-2023-31999Moderate

fastify-oauth2: CSRF due to reused Oauth2 state

Jul 4, 2023

References

auth0.com / docs/secure/attack-protection/state-parameters
Exploit
github.com / fastify/fastify-oauth2/releases/tag/v7.2.0
Release Notes
hackerone.com / reports/2020418
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