Critical severity · published Oct 12, 2026
CVE-2026-109321
Grav Login OAuth Plugin before 1.4.3 Predictable Local Credentials Authentication Bypass
9.1
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 34% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
grav-plugin-login-oauth · getgrav
1.0.0-beta.1 before 1.4.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-109321
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-109321
vendor-advisory
https://github.com/getgrav/grav/security/advisories/GHSA-mj8v-hvf6-73gm
third-party-advisory
https://www.vulncheck.com/advisories/grav-login-oauth-plugin-before-1.4.3-predictable-local-credentials-authentication-bypass