CVE-2021-25963

MEDIUMNVD 6.16.1—Elevated

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.

CVSS v3: 6.1
EG Score: 6.1(medium)
EPSS: 60.7%
KEV: Not listed

Published

September 30, 2021

Last Modified

November 21, 2024

References (4)

vulnerabilitylab@mendhttps://github.com/shuup/shuup/commit/75714c37e32796eb7cbb0d977af5bcaa26573588
vulnerabilitylab@mendhttps://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25963
af854a3a-2127-422b-91ae-364da2661108https://github.com/shuup/shuup/commit/75714c37e32796eb7cbb0d977af5bcaa26573588
af854a3a-2127-422b-91ae-364da2661108https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25963

Affected Packages

(1 across 1 ecosystem)

PyPI(1)

Package	Vulnerable range	Fixed in	Dependents
shuup	1.10.0 ... 2.9.2 (134 versions)	2.11.0	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-79Cross-site Scripting (XSS)

Data Freshness Timeline

(refreshed 11× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 09:41 UTCEG score recompute
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-25963?

CVE-2021-25963 is a medium vulnerability published on September 30, 2021. 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.

When was CVE-2021-25963 disclosed?

CVE-2021-25963 was first published in the National Vulnerability Database on September 30, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-25963 actively exploited?

CVE-2021-25963 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 60.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-25963?

CVE-2021-25963 has a CVSS v3 base score of 6.1 (NVD).

How do I remediate CVE-2021-25963?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-25963, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-25963

📅 Published

🔄 Last Modified

🔗 References (4)

Affected Packages

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-25963?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)