[LukeTowers]

The Twig security policy decides what a template may call by name, and is never handed the arguments of a call — so a method that is harmless in itself but runs a callable it is given cannot be judged by name alone. That is the shape behind most of what follows.

The policy now follows __call forwarding for Halcyon models and for components, the way it already did for the Eloquent family, so a name refused on the receiver stays refused when it is reached through a forwarder. CmsCompoundObject's passthru dispatch goes through the proxy layer rather than onto a raw collection, and stripCallables() tests the callable form of composite values as well as scalars.

Upgrade notes:

• tap(), pipe(), when() and unless() are refused on every object a template holds, including Laravel's proxy form {{ posts.when(cond).sortBy('x') }}, which a template expresses with {% if %} instead. The Stringable when*() family goes too.
• A wildcard markup helper refuses an argument that is, or contains at any depth, a PHP callable that is not a plain string, and refuses a string in a position the resolved method declares as callable/Closure. A list of exactly two strings is the one exception, because that is how a template writes an ordinary short list and PHP reads any such list as callable when its first value names a class that can dispatch the second — so {{ html_ul(post.tags) }} and {{ array_only(map, keys) }} keep working whatever their values spell. The callback positions this closes belong to array_map, array_first, array_last, array_where and array_build: a template that named a function there needs a Twig filter or a component method instead. This applies in every Twig environment the helpers are registered in — mail templates and .htm views included — because the guard travels with the helper rather than with the sandbox. A variadic target keeps its own classification for the arguments its signature folds into one parameter, so array_cross_join(listA, listB) accepts ordinary lists in every position.
• Attachment fromPost, fromFile, fromStorage, fromData, fromUrl, setDataAttribute, deleteThumbs and getDisk are refused. Reading an attachment is unaffected.
• this.session.put, forget and pull are refused for keys beginning _, admin_auth, winter_auth, login_, password_hash_ or widget., including the array forms and a key passed as a named argument. widget itself is refused too, since the store resolves keys with Arr::get() and a value written to the container is read back under the dotted key. The _ prefix is wider than the framework's own keys, so a theme that used underscore-prefixed names as its own convention has to rename them.
• Query builder and Eloquent builder: the join/union family, selectSub, fromQuery, searchWhere, withCasts, setQuery, the aggregate and index-hint methods, and macroCall on any object. Ordinary reads on the model's own table are unaffected.
• Halcyon write methods and from() are refused through a page, layout or partial; the read API is unaffected. A component that defines its own run, runPage, renderPage, renderPartial, renderContent, getLoader or combineAssets and calls it from a template is now refused.
• Paginators: render() and links() accept no view name, a pagination:: view, or a view under any registered namespace's own pagination directory — system::pagination.simple-default, or acme.plugin::pagination.custom for a plugin or theme shipping its own. Any other name is refused, as is any name containing .. or either path separator. defaultView, defaultSimpleView, viewFactory, the use*() presets, mapInto() and pipeInto() are refused on a paginator.
• Fixed by the shared guard: this.page.lists('url'), this.page.where('url', ...), this.theme.listPages().where('url', ...) and withComponent('session') return correct values again — the proxy had been nulling those names because a global url() or session() helper makes them look callable. A multi-sort specification (sortBy([['date', 'desc'], ['title', 'asc']])) also survives, since sortByMany() reads each pair with data_get() and never invokes it, while a callable nested inside a pair is still stripped. A multi-level groupBy() whose first two keys happen to name an aliased facade and a method on it is refused rather than grouped; that shape did not group before this change either, because Collection::groupBy() treats a callable array as the grouping callback instead of a list of keys.

Summary by CodeRabbit

• Security
  • Tightened safeguards for CMS templates, blocking file writes, access beyond the active theme, unsafe query operations, callback execution, and prohibited macro calls.
  • Protected reserved session values from template changes and restricted unsafe attachment and pagination-view operations.
• Bug Fixes
  • Preserved supported read-only queries, pagination, and normal page, query, and partial rendering.
  • Improved validation of wildcard template functions and filters, including calls with variadic callback parameters.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 8edeff6 and 3e1bbaa.

📒 Files selected for processing: 3

• modules/system/classes/MarkupManager.php
• modules/system/tests/classes/MarkupManagerTest.php
• modules/system/tests/twig/SecurityPolicyTest.php

🚧 Files skipped from review as they are similar to previous changes: 1

• modules/system/classes/MarkupManager.php

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Walkthrough

The change expands Twig sandbox checks for method calls, callback arguments, database queries, sessions, attachments, and paginator views. It adds shared forwarding proxies and updates safe-object casting for CMS and session objects. New tests cover blocked calls and confirm that selected read-only CMS rendering and model queries still work.

Priority: ⬆️ High

Estimated code review effort: 4 (Complex) | ~60 minutes

Severity of issue fixed: High

Merge Risk: ⚪ Minimal · up to 3e1bb

No outstanding actionable issue is established for these sandbox changes; merge after normal checks.

Security architecture risk: 🔵 Low · up to 8edef

The change substantially tightens template permissions. One low-severity issue remains in callable-argument enforcement, but the available comparison does not show that this PR introduced or worsened its exposure.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The independently attackable surface is template execution with access to the registered wildcard helpers or supplied objects, not a demonstrated cross-tenant or cross-service privilege. Registration across every non-CMS Twig environment was not established.

Security Findings and Attack Paths

• observed — A retained low-severity finding concerns enforcement of reflected callable argument positions: the check reads the numeric argument at each reflected position. The supplied finding leaves exploit reachability unknown. The pre-PR dispatcher had no argument check, so the available base/head comparison does not establish an introduced or worsened exposure.

Trust Boundaries and Controls

• observed — The wildcard dispatcher rejects macro registration and callable-shaped values before invoking a helper. Tests cover callback arguments, deferred callable setters, macro registration, and ordinary data arguments.
• observed — Session key checks and paginator view checks run before their proxies forward calls. Named key and view arguments are resolved rather than assumed to occupy numeric position zero.

Hardening Proposals

• proposed — Exercise nullable, variadic, and named callable arguments against the actual registered wildcard helpers to establish the retained finding’s reachability and guard behavior.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 64.88% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 168 functions across 14 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: restricting CMS template calls within the Twig sandbox.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.

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Actionable comments posted: 2

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
In `@modules/system/classes/MarkupManager.php`:
- Around line 430-438: Update the callable-argument validation loop so every
supplied argument is checked against its declared parameter, mapping trailing
arguments to the variadic parameter when applicable. Reject non-null values
mapped to nullable variadic callable parameters, including values after a
leading null, while preserving the existing error behavior.

In `@modules/system/tests/twig/SecurityPolicyTest.php`:
- Line 1834: Replace Event::flush with Event::forget for the
cms.theme.getActiveTheme event in the test setup, so registered listeners are
removed before the fixture is rendered.

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ℹ️ Review info

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between 4ab9e5a and 8edeff6.

📒 Files selected for processing (13)

• modules/cms/classes/CmsCompoundObject.php
• modules/cms/tests/classes/ControllerSandboxTest.php
• modules/system/classes/MarkupManager.php
• modules/system/tests/fixtures/twig/SandboxCanary.php
• modules/system/tests/twig/SecurityPolicyDatabaseTest.php
• modules/system/tests/twig/SecurityPolicyTest.php
• modules/system/twig/SecurityPolicy.php
• modules/system/twig/node/GetAttrNode.php
• modules/system/twig/securitypolicy/ResolvesNamedArguments.php
• modules/system/twig/securitypolicy/SafeCollection.php
• modules/system/twig/securitypolicy/SafePaginator.php
• modules/system/twig/securitypolicy/SafeProxy.php
• modules/system/twig/securitypolicy/SafeSession.php

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