Vulnerability · Published Aug 13, 2026 · Assigned by GitHub_M

CVE-2026-73302Budibase: OIDC SSO account takeover: incoming identity linked by email without checking email_verified

Critical 9.0

In plain English

A critical-severity improper authentication in budibase from Budibase. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).

Severity (CVSS 4.0)9.0Critical

Exploit odds (30 days)0.4%top 62.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Budibase is an open-source low-code platform. Prior to 3.39.30, the OIDC flow in packages/backend-core/src/middleware/passport/sso/oidc.ts resolved an email without getEmailVerified or an email_verified requirement, and packages/backend-core/src/middleware/passport/sso/sso.ts then used users.getGlobalUserByEmail as a fallback account-linking key. An attacker who can authenticate through a configured identity provider that asserts a victim email as unverified can have a fresh provider identity merged into the victim Budibase account and inherit the victim roles. This issue is fixed in version 3.39.30.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@budibase/server	no fix listed	GHSA-hp6v-6jw7-gv2f

Affected products (as reported)

Vendor	Product	Versions
Budibase	budibase	< 3.39.30

Weakness: CWE-287 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

References

https://github.com/Budibase/budibase/security/advisories/GHSA-hp6v-6jw7-gv2f x_refsource_CONFIRM
https://github.com/Budibase/budibase/pull/19173 x_refsource_MISC
https://github.com/Budibase/budibase/commit/9ecd0048d9c3ae0ee9bd0e6204c621794dd1a4d3 x_refsource_MISC
https://github.com/Budibase/budibase/releases/tag/3.39.30 x_refsource_MISC