CVE-2026-109321

Critical

Description

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.

SeverityCritical

CVSS9.1

Exploit probability—

ProductGetgrav Grav-plugin-login-oauth

PublishedOct 12, 2026

First seenOct 12, 2026

Weakness typeCWE-1391CWE-1391

How to fix

Update

getgrav grav-plugin-login-oauth1.4.3 or later

Vendor advisories

github.com/getgrav/grav/security/advisories/GHSA-mj8v-hvf6-73gm

Affected products

Product	Affected versions	Fixed in
getgrav grav-plugin-login-oauth	1.0.0-beta.1 ≤ v < 1.4.3	1.4.3

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