What’s Vulnerable › Vulnerabilities

CVE-2026-109321: Grav Login OAuth Plugin before 1.4.3 Predictable Local Credentials Authentication Bypass

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-12 · updated 2026-10-18
• Weakness: CWE-1391

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.

Affected products

• getgrav grav-plugin-login-oauth: from 1.0.0-beta.1 before 1.4.3 — fixed in 1.4.3

How to fix

Upgrade to a fixed version: getgrav grav-plugin-login-oauth 1.4.3. Check the vendor advisory for mitigations.

References

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

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