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

Quick assessment

Affected
getgrav grav-plugin-login-oauth
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Grav Login OAuth 插件（grav-plugin-login-oauth）在 1.4.3 版本之前，会将通过 OAuth 登录的账户作为普通的 Grav 用户处理，使用确定的 格式的用户名，以及基于提供者标识符的无盐 MD5 哈希值作为密码，同时未禁用密码登录功能。未认证的远程攻击者如果获悉或猜出某个提供者的标识符，就可以重现这些凭据并成功登录，从而获得特权账户的管理控制权。

CVSS 9.1 · Critical EPSS 0.40% · P33

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav-plugin-login-oauth 1.0.0-beta.1< 1.4.3 affected
1.4.3 unaffected
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I. Basic Information for CVE-2026-109321

Vulnerability Information
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Vulnerability Title
Grav Login OAuth Plugin before 1.4.3 Predictable Local Credentials Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1391
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
getgrav grav-plugin-login-oauth 1.0.0-beta.1 ~ 1.4.3 -

II. Public POCs for CVE-2026-109321

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III. Intelligence Information for CVE-2026-109321

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Vendor Advisories for CVE-2026-109321 (2)

Same Patch Batch · getgrav · 2026-10-12 · 14 CVEs total

CVE-2026-109313 8.1 HIGH Grav Login Plugin 2.7.0 before 3.9.9 2FA Bypass via Remember-Me Cookie
CVE-2026-109312 8.1 HIGH Grav Login Plugin 2.7.0 before 3.9.9 2FA Bypass via Profile Update Form
CVE-2026-109325 7.5 HIGH Grav from 2.0.22 before 2.1.7 Clockwork Profiler Authentication Bypass via Proxy
CVE-2026-109326 7.5 HIGH Grav before 2.1.7 Information Disclosure via Nested .git Directories
CVE-2026-109314 7.3 HIGH Grav Login Plugin 1.2.0 before 3.9.9 Password Reset Token Disclosure via Reset Page
CVE-2026-109317 7.2 HIGH Grav API Plugin before 1.0.36 Privilege Escalation via Scalar Access Grants
CVE-2026-109315 6.5 MEDIUM Grav 2.0.22 before 2.1.7 Clockwork Debugger Token Disclosure via Twig Sandbox
CVE-2026-109324 6.5 MEDIUM Grav before 2.1.7 Memory Exhaustion via Oversized Image Transforms
CVE-2026-109316 6.5 MEDIUM Grav Data Manager 1.4.0 through 1.4.5 Unauthenticated File Deletion via Admin
CVE-2026-109322 6.1 MEDIUM Grav Guestbook before 0.5.2 Stored XSS via AJAX Pagination and Admin Views
CVE-2026-109320 5.4 MEDIUM Grav API Plugin before 1.0.36 Disabled Account Session Access Bypass
CVE-2026-109323 5.3 MEDIUM Grav Star Ratings 2.0.1 through 2.0.3 Missing Server-Side vote_access Authorization
CVE-2026-109319 4.3 MEDIUM Grav Guestbook Plugin 0.5.0 and 0.5.1 Missing Authorization and CSRF in Moderation

IV. Related Vulnerabilities

Same vendor: getgrav
Same weakness: CWE-1391

V. Comments for CVE-2026-109321

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