CVE-2021-3841: sylius/sylius versions prior to 1.9.10, 1.10.11, and 1.11.2 are vulnerable to stored cross-site scripting (XSS

Routine

MEDIUM 5.4UPGRADE

CVE-2021-3841 is a medium-severity flaw (CVSS 5.4) affecting sylius. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

sylius/sylius versions prior to 1.9.10, 1.10.11, and 1.11.2 are vulnerable to stored cross-site scripting (XSS) through SVG files. This vulnerability allows attackers to inject malicious scripts that can be executed in the context of the user's browser.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-11-15
Last modified	2026-06-17

Publisher (CNA): huntr.dev · Vendor: sylius

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-11-15 11:15 UTCPublished CVE record published
2026-06-17 04:05 UTCUpdated Record last modified

sylius sylius UPGRADE

Affected: < 1.9.10 · >= 1.10.0 and < 1.10.11 · >= 1.11.0 and < 1.11.2

Fixed in: 1.9.10, 1.10.11, 1.11.2

Safe to downgrade to: a release before 1.10.0

1. Check installed version

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

2. UPGRADE to 1.9.10 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sylius

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 1.10.0 (Debian / Ubuntu)

apt-cache madison sylius sudo apt install sylius=<VERSION_BEFORE_1.10.0> sudo apt-mark hold sylius

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

dnf --showduplicates list sylius sudo dnf downgrade sylius-<VERSION_BEFORE_1.10.0> sudo dnf versionlock add sylius

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.

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-2021-3841?

sylius: upgrade to 1.9.10, 1.10.11, 1.11.2. Exact commands for each OS are on this page.

Is CVE-2021-3841 being exploited?

CVE-2021-3841 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-2021-3841 affect?

CVE-2021-3841 affects sylius. Severity is medium (CVSS 5.4). sylius/sylius versions prior to 1.9.10, 1.10.11, and 1.11.2 are vulnerable to stored cross-site scripting (XSS) through SVG files. This vulnerability allows attackers to inject malicious scripts that can be executed in the context of the us

How urgent is CVE-2021-3841?

Priority 23/100. No elevated risk signals yet.

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References

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