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CVE-2026-100671— Grav before 2.0.25 Session Cookie Theft via Twig Sandbox

Quick assessment

Affected
getgrav grav
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 是一个基于文件的 CMS（内容管理系统）。在版本 2.0.19 至 2.0.24 中，以及在版本 2.0.0 至 2.0.18 和 1.7.x 中（仅限于明确启用了内容 Twig 模板处理功能的情况），由仅拥有“页面写入”权限的用户撰写的页面内容，会通过一个 Twig 沙箱进行渲染。该沙箱允许调用 函数，该函数会返回随当前请求发送的任何 Cookie，包括访问者的会话 Cookie。由于该读取操作是通过服务器端的 执行的，因此 HttpOnly、Secure 和 SameSite 等 Cookie 属性无

CVSS 8.0 · High EPSS 0.29% · P19
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I. Basic Information for CVE-2026-100671

Vulnerability Information
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Vulnerability Title
Grav before 2.0.25 Session Cookie Theft via Twig Sandbox
Source: CVE Program / CVE List V5
Vulnerability Description
Grav is a flat-file CMS. In versions 2.0.19 through 2.0.24 — and in 2.0.0 through 2.0.18 and 1.7.x only where content Twig has been explicitly enabled — page content authored by a user holding only page-write permission is rendered through a Twig sandbox that allowlists get_cookie(), which returns any cookie sent with the current request, including the visitor's session cookie. Because the read occurs server-side via filter_input(INPUT_COOKIE, ...), the HttpOnly, Secure and SameSite attributes offer no protection. Grav then stores the finished post-Twig output in a page-content cache keyed only on page identity and the configuration checksum, with no session, user or request dimension and no bypass for authenticated visitors. A page published by a page-write user can therefore capture the session identifier of the next administrator who views it, after which the cached output serves that identifier to unauthenticated visitors, who can replay the cookie to authenticate as that administrator. Since 2.0.19, security.twig_content.process_enabled defaults to true and Security::applyTwigContentDefault() derives each page's process.twig flag from that gate, so content Twig runs on every page with no frontmatter or operator action. Fixed in 2.0.25; 1.7.x is outside the backport scope.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
getgrav grav 0 ~ 2.0.25 -

II. Public POCs for CVE-2026-100671

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III. Intelligence Information for CVE-2026-100671

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Vendor Advisories for CVE-2026-100671 (1)

Other References for CVE-2026-100671 (1)

Same Patch Batch · getgrav · 2026-09-26 · 7 CVEs total

CVE-2026-100670 8.8 HIGH Grav CMS 2.0.14 through 2.0.24 Privilege Escalation via Blueprint Guard Bypass
CVE-2026-100673 8.2 HIGH Grav Data Manager before 1.4.5 Stored XSS via item-detail view
CVE-2026-100669 7.5 HIGH Grav before 2.0.25 Sensitive File Disclosure via Case-Variation Bypass
CVE-2026-100672 7.5 HIGH grav-plugin-comments before 1.2.11 Unauthenticated Information Disclosure
CVE-2026-100668 6.5 MEDIUM Grav before 2.0.25 Sandbox Escape via array Filter
CVE-2026-100667 5.3 MEDIUM grav-plugin-login 3.8.7 through 3.9.6 Two-Factor Authentication Bypass

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-200

V. Comments for CVE-2026-100671

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