Scriban: Template Writes to Arbitrary CLR Properties via TypedObjectAccessor (Mass Assignment + private / init / internal Setter Bypass)

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

7.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P · score source

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

<!-- obsidian --<h2 data-heading="Description"Description</h2 <pWhen a host pushes a CLR object into a Scriban <codeTemplateContext</code via the standard, documented pattern —</p <pre<code class="language-csharp"var so = new ScriptObject(); so["user"] = currentUser; // direct CLR reference context.PushGlobal(so); </code</pre <p— <codeTypedObjectAccessor</code exposes every public-getter property for <strongboth reading and writing</strong, and writes land on the live host object and <strongpersist after <codeRender()</code returns</strong. The write path performs no <codeCanWrite</code and no setter-visibility check, producing two related but distinct weaknesses:</p <p<strong(A) Mass assignment of public setters — CWE-915 (originally F-002).</strong Any <code{ get; set; }</code property is writable from template code (<code{{ user.isadmin = true }}</code, <code{{ order.totalprice = 0 }}</code). This is "surprising but technically consistent with the setter being public" — and…

Published by the source

6 Jul 2026, 17:30 UTC

Last modified by the source

6 Jul 2026, 17:30 UTC

Source last checked

26 Oct 2026, 17:05 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-7jvp-hj45-2f2m

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# Patch Next advisory brief: GHSA-7jvp-hj45-2f2m

Advisory: Scriban: Template Writes to Arbitrary CLR Properties via `TypedObjectAccessor` (Mass Assignment + `private` / `init` / `internal` Setter Bypass)
IDs: GHSA-7jvp-hj45-2f2m
Record: https://patchnext.com/advisories/ghsa-7jvp-hj45-2f2m (revision 1, source checked 26 Oct 2026, 17:05 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: scriban 7.2.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet scriban: affected <= 7.2.1; fixed in 7.2.2

## Suggested inspection (read-only)
- NuGet scriban: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on scriban.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-7jvp-hj45-2f2m (GitHub-reviewed advisory GHSA-7jvp-hj45-2f2m lists affected ranges: NuGet scriban >=0 <=7.2.1)

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