CVE-2026-109321

CRITICAL 9.1

Grav Login OAuth Plugin before 1.4.3 Predictable Local Credentials Authentication Bypass

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

0th

Grav Login OAuth plugin (grav-plugin-login-oauth) before 1.4.3 provisions OAuth accounts as ordinary Grav users with a deterministic <provider>.<id> username and an unsalted MD5 hash of the provider identifier as the password, without disabling password login. Unauthenticated remote attackers who learn or guess a provider identifier can reproduce these credentials and log in, gaining administrative control of privileged accounts.

CWE	CWE-1391
Vendor	getgrav
Product	grav-plugin-login-oauth
Published	Oct 12, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

getgrav / grav-plugin-login-oauth

1.0.0-beta.1 < 1.4.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/getgrav/grav/security/advisories/GHSA-mj8v-hvf6-73gm vulncheck.com: https://www.vulncheck.com/advisories/grav-login-oauth-plugin-before-1.4.3-predictable-local-credentials-authentication-bypass

Credits

🔍 AlpetGexha