How severe is CVE-2021-25963?

CVE-2021-25963 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-25963 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25963?

CVE-2021-25963 affects Shuup. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25963?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-25963 published?

CVE-2021-25963 was published on 2021-09-30 and last updated on 2026-06-17.

CVE-2021-25963

CVE-2021-25963 is a medium-severity vulnerability in Shuup with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Shuup
Published: 2021-09-30
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-25963?: 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 severe is CVE-2021-25963?: CVE-2021-25963 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-25963 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25963?: CVE-2021-25963 affects Shuup. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25963?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-25963 published?: CVE-2021-25963 was published on 2021-09-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:shuup:shuup:*:*:*:*:*:*:*:*

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