CVE-2023-2017: Server-side Template Injection (SSTI) in Shopware 6 (<= v6.4.20.0, v6.5.0.0-rc1 <= v6.5.0.0-rc4), affecting bo

Q: How urgent is CVE-2023-2017?

Priority 56/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2023-2017 is a high-severity flaw (CVSS 8.8) affecting shopware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Server-side Template Injection (SSTI) in Shopware 6 (<= v6.4.20.0, v6.5.0.0-rc1 <= v6.5.0.0-rc4), affecting both shopware/core and shopware/platform GitHub repositories, allows remote attackers with access to a Twig environment without the Sandbox extension to bypass the validation checks in `Shopware\Core\Framework\Adapter\Twig\SecurityExtension` and call any arbitrary PHP function and thus execute arbitrary code/commands via usage of fully-qual

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.1% (top 19%)
CISA exploited list	No
Weakness	CWE-184, CWE-1336, CWE-94
Published	2023-04-17
Last modified	2026-10-24

Publisher (CNA): STAR Labs SG Pte. Ltd. · Vendor: shopware

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-04-17 11:15 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

shopware shopware UPGRADE

Affected: >= 6.1.0 and <= 6.4.20.0 · 6.5.0.0 rc1 · 6.5.0.0 rc2 · 6.5.0.0 rc3

Fixed in: newer than 6.4.20.0

Safe to downgrade to: a release before 6.1.0

1. Check installed version

apt-cache policy shopware || rpm -q shopware || shopware --version

2. UPGRADE to newer than 6.4.20.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade shopware

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade shopware

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.1.0 (Debian / Ubuntu)

apt-cache madison shopware sudo apt install shopware=<VERSION_BEFORE_6.1.0> sudo apt-mark hold shopware

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list shopware sudo dnf downgrade shopware-<VERSION_BEFORE_6.1.0> sudo dnf versionlock add shopware

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Composer (PHP) · shopware/platform · FIXED · 6.4.20.1 · vulnerable: <= 6.4.20.0 · source

composer require "shopware/platform:>=6.4.20.1"

Composer (PHP) · shopware/core · FIXED · 6.4.20.1 · vulnerable: <= 6.4.20.0 · source

composer require "shopware/core:>=6.4.20.1"

Fedora 46 · gnome-shell-extension-tiling-assistant · FIXED · 56-1.fc46 · FEDORA-2026-ebf66a5321 · source

sudo dnf upgrade --advisory=FEDORA-2026-ebf66a5321

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: starlabs.sg/advisories/23/23-2017/

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-2017?

shopware: upgrade to newer than 6.4.20.0. Exact commands for each OS are on this page.

Is CVE-2023-2017 being exploited?

CVE-2023-2017 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-2017 affect?

CVE-2023-2017 affects shopware. Severity is high (CVSS 8.8). Server-side Template Injection (SSTI) in Shopware 6 (<= v6.4.20.0, v6.5.0.0-rc1 <= v6.5.0.0-rc4), affecting both shopware/core and shopware/platform GitHub repositories, allows remote attackers with access to a Twig environment without the

How urgent is CVE-2023-2017?

Priority 56/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities · GitHub vulnerabilities

References

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