CVE-2026-126276

NocoDB before 2026.08.1 Client Authentication Bypass via OAuth Token Exchange

Published Nov 13, 2026 CVSS 4.0 · 8.2 High EPSS n/a KEV · Not listed

Description

NocoDB before 2026.08.1 contains an authentication bypass vulnerability in oauth-token.service.ts that treats PKCE as a substitute for confidential client authentication, skipping client secret verification when omitted. Attackers holding a captured authorization code and PKCE verifier can mint access tokens and 60-day refresh tokens for a confidential client without knowing its secret.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

nocodb

unaffected

Version	Status	Constraints
`0`	affected	< 2026.08.1
`2026.08.1`	unaffected	—

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://github.com/nocodb/nocodb/security/advisories/GHSA-4cx5-q9xx-5pgj
https://www.vulncheck.com/advisories/nocodb-before-2026.08.1-client-authentication-bypass-via-oauth-token-exchange

History

Nov 13, 2026 9:45 AM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		NocoDB before 2026.08.1 contains an authentication bypass vulnerability in oauth-token.service.ts that treats PKCE as a substitute for confidential client authentication, skipping client secret verification when omitted. Attackers holding a captured authorization code and PKCE verifier can mint access tokens and 60-day refresh tokens for a confidential client without knowing its secret.
Title		NocoDB before 2026.08.1 Client Authentication Bypass via OAuth Token Exchange
First Time appeared		Nocodb Nocodb nocodb
Weaknesses		CWE-287
CPEs		cpe:2.3:a:nocodb:nocodb::::::::
Vendors & Products		Nocodb Nocodb nocodb
References		https://github.com/nocodb/nocodb/security/advisories/GHSA-4cx5-q9xx-5pgj https://www.vulncheck.com/advisories/nocodb-before-2026.08.1-client-authentication-bypass-via-oauth-token-exchange
Metrics		cvssV3_1 `{'score': 6.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N'}` cvssV4_0 `{'score': 8.2, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N'}`