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CVE-2026-62669— Grav Login Plugin: 2FA Bypass via 'login.regenerate2FASecret' - Secret Rotation During Pending Challenge

Quick assessment

Affected
getgrav grav
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Grav是Grav组织开源的一款基于文件的扁平化内容管理系统。 Grav 2.0.4之前版本和Grav Login Plugin 3.8.11之前版本存在授权问题漏洞，该漏洞源于login.regenerate2FASecret任务仅检查待处理会话用户存在而未要求用户授权，可能导致攻击者在提交受害者正确密码后，在TOTP挑战期间覆盖twofa_secret并完成身份验证。

CVSS 7.4 · High EPSS 0.39% · P31

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav < 2.0.4 affected
getgrav grav-plugin-login < 3.8.11 affected
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I. Basic Information for CVE-2026-62669

Vulnerability Information
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Vulnerability Title
Grav Login Plugin: 2FA Bypass via 'login.regenerate2FASecret' - Secret Rotation During Pending Challenge
Source: CVE Program / CVE List V5
Vulnerability Description
Grav Login Plugin adds login, basic ACL, and session wide messages to Grav. Prior to 3.8.11, the Grav Login plugin login.regenerate2FASecret task checks only that the pending-session user exists rather than requiring $user->authorized. After submitting a victim's correct password, an attacker can invoke taskRegenerate2FASecret() during the pending TOTP challenge, overwrite twofa_secret, read the replacement secret from the response, calculate a valid code, and complete authentication without the victim's second factor. This issue is fixed in version 3.8.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Grav 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav是Grav组织开源的一款基于文件的扁平化内容管理系统。 Grav 2.0.4之前版本和Grav Login Plugin 3.8.11之前版本存在授权问题漏洞，该漏洞源于login.regenerate2FASecret任务仅检查待处理会话用户存在而未要求用户授权，可能导致攻击者在提交受害者正确密码后，在TOTP挑战期间覆盖twofa_secret并完成身份验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
getgrav grav < 2.0.4 -
getgrav grav-plugin-login < 3.8.11 -

II. Public POCs for CVE-2026-62669

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Qwen3.6-35B-A3B · 10121 chars
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III. Intelligence Information for CVE-2026-62669

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Patches & Fixes for CVE-2026-62669 (1)

Vendor Advisories for CVE-2026-62669 (1)

Vendor Pages for CVE-2026-62669 (1)

Same Patch Batch · getgrav · 2026-08-19 · 17 CVEs total

CVE-2026-62668 9.4 CRITICAL Grav API Plugin: Webhook SSRF via Unrestricted cURL Protocols
CVE-2026-62666 8.8 HIGH Grav API Plugin: non-super api.users.write manager -> super-admin via createApiKey (incomp
CVE-2026-64850 8.7 HIGH Grav: Remote code execution via unrestricted callable in Blueprint::dynamicData()
CVE-2026-64852 8.7 HIGH Grav API Plugin: Missing authorization on API-key generate/revoke lets any admin.login use
CVE-2026-64851 8.5 HIGH Grav Shortcode Core Plugin: Stored XSS in shortcode-core attribute handlers
CVE-2026-62673 8.2 HIGH Grav: .htaccess file extension rules bypass via case variation on case-insensitive filesys
CVE-2026-63407 8.2 HIGH Grav API Plugin: CORS 'Access-Control-Allow-Origin: *' on Authenticated API Responses
CVE-2026-62667 8.1 HIGH Grav API Plugin : API Key 'scopes' Never Enforced - Delegated Least-Privilege Keys Carry F
CVE-2026-63408 7.5 HIGH Grav API Plugin: JWT Access Token Accepted via `?token=` URL Query Parameter
CVE-2026-61690 6.5 MEDIUM Grav: Decompression Bomb via ZipArchiver - Missing Extraction Limits
CVE-2026-61842 6.5 MEDIUM Grav: Twig sandbox config exfiltration via grav.offsetGet + dump filter (CVE-2026-44738 by
CVE-2026-62670 6.3 MEDIUM Fail-open authorization in grav-plugin-flex-objects admin-next API: api.access user gets f
CVE-2026-62672 6.0 MEDIUM Grav: Authenticated ReDoS via regex_replace in Twig Sandbox
CVE-2026-62671 5.4 MEDIUM CSRF in grav-plugin-login: anonymous attacker rotates a logged-in user's 2FA (TOTP) secret
CVE-2026-53654 5.3 MEDIUM Grav: Unauthenticated open redirect via login twofa_cancel _redirect
CVE-2026-61607 4.6 MEDIUM Grav API Plugin: Stored XSS via SVG Upload - API Media Pipeline Bypasses Sanitizer

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-287

V. Comments for CVE-2026-62669

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