CVE-2026-21631

MEDIUMNVD 5.45.4—

5.4

Lack of output escaping leads to a XSS vector in the multilingual associations component.

CVSS v3: 5.4
EG Score: 5.4(medium)
EPSS: 0.0%
KEV: Not listed

Published

April 1, 2026

Last Modified

April 9, 2026

References (2)

Weakness Classification(1)

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

CWE-79Cross-site Scripting (XSS)

Data Freshness Timeline

(refreshed 12× in last 7d / 16× 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.

2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-22 21:16 UTCepss_batch
2026-05-20 19:39 UTCEG score recompute
2026-05-20 19:39 UTCGHSA enrichment
2026-05-18 21:31 UTCepss_batch

Frequently asked(5)

What is CVE-2026-21631?

CVE-2026-21631 is a medium vulnerability published on April 1, 2026. Lack of output escaping leads to a XSS vector in the multilingual associations component.

When was CVE-2026-21631 disclosed?

CVE-2026-21631 was first published in the National Vulnerability Database on April 1, 2026, with the most recent update on April 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-21631 actively exploited?

CVE-2026-21631 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-21631?

CVE-2026-21631 has a CVSS v3 base score of 5.4 (NVD).

How do I remediate CVE-2026-21631?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21631, 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-2026-21631

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-21631?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)