CVE-2021-25963: In Shuup, versions 1.6.0 through 2.10.8 are vulnerable to reflected Cross-Site Scripting (XSS) that allows exe

Routine

MEDIUM 6.1UPGRADE

CVE-2021-25963 is a medium-severity flaw (CVSS 6.1) affecting shuup. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Shuup, versions 1.6.0 through 2.10.8 are vulnerable to reflected Cross-Site Scripting (XSS) that allows execution of arbitrary javascript code on a victim browser. This vulnerability exists due to the error page contents not escaped.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.0% (top 39%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-09-30
Last modified	2026-06-17

Publisher (CNA): Mend · Vendor: shuup

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

Am I affected?

Timeline

2021-09-30 08:15 UTCPublished CVE record published
2026-06-17 03:42 UTCUpdated Record last modified

shuup shuup UPGRADE

Affected: >= 1.6.0 and <= 2.10.8

Fixed in: newer than 2.10.8

Safe to downgrade to: a release before 1.6.0

1. Check installed version

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

2. UPGRADE to newer than 2.10.8 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade shuup

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 1.6.0 (Debian / Ubuntu)

apt-cache madison shuup sudo apt install shuup=<VERSION_BEFORE_1.6.0> sudo apt-mark hold shuup

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

dnf --showduplicates list shuup sudo dnf downgrade shuup-<VERSION_BEFORE_1.6.0> sudo dnf versionlock add shuup

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-2021-25963?

shuup: upgrade to newer than 2.10.8. Exact commands for each OS are on this page.

Is CVE-2021-25963 being exploited?

CVE-2021-25963 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-2021-25963 affect?

CVE-2021-25963 affects shuup. Severity is medium (CVSS 6.1). In Shuup, versions 1.6.0 through 2.10.8 are vulnerable to reflected Cross-Site Scripting (XSS) that allows execution of arbitrary javascript code on a victim browser. This vulnerability exists due to the error page contents not escaped.

How urgent is CVE-2021-25963?

Priority 37/100. No elevated risk signals yet.

Related CVEs

CVE-2021-25962 HIGH 8.0 UPGRADE “Shuup” application in versions 0.4.2 to 2.10.8 is affected by the “Formula Injection” vulnerability

References

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