# CVE-2026-103849: Adobe Commerce | Improper Neutralization of Special Elements Used in a Template Engine (CWE-1336)

> Adobe Commerce allows arbitrary code execution via template injection, enabling attackers to gain elevated access or control over user accounts without interaction.

- **Severity:** Critical 10.0 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 13 Oct 2026
- **Updated:** 20 Oct 2026
- **Also known as:** GHSA-r2jr-3wj5-6696, ROOT-APP-COMPOSER-CVE-2026-103849

## What is CVE-2026-103849?

CVE-2026-103849 is a critical code injection vulnerability in Adobe Commerce, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Adobe Commerce is affected by an Improper Neutralization of Special Elements Used in a Template Engine vulnerability that could result in arbitrary code execution in the context of the current user, potentially gaining elevated access or control over the victim's account or session. Exploitation of this issue does not require user interaction. Scope is changed.

Weakness: CWE-1336 (Improper Neutralization of Special Elements Used in a Template Engine)

## Which versions are affected by CVE-2026-103849?


## How do I fix CVE-2026-103849?

Apply the vendor's patch.

## Is CVE-2026-103849 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103849 exists.

Public exploit code:

- CVE-2026-103849 (BlockStrap) reproduction lab: unauthenticated {{block}} injection on Magento 2.4.9 via guest GraphQL, A/B vs APSB26-153; command execution only through a labeled synthetic gadget, not stock classes. (github_poc): https://github.com/dinosn/cve-2026-103849-blockstrap-lab

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-103849 and fix it if it is affected.

What it is: CVE-2026-103849 is a critical code injection vulnerability in Adobe Commerce, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103849 exists.

Affected product: Adobe Commerce. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-103849/ (Markdown: https://insights.sbomify.com/CVE-2026-103849/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-103849
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-103849
- OSV: https://osv.dev/vulnerability/CVE-2026-103849

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-103849/
Summaries are generated and may contain mistakes; the official description above is the record.