CVE-2026-21629

HIGHNVD 7.37.3—

7.3

The ajax component was excluded from the default logged-in-user check in the administrative area. This behavior was potentially unexpected by 3rd party developers.

CVSS v3: 7.3
EG Score: 7.3(medium)
EPSS: 0.0%
KEV: Not listed

Published

April 1, 2026

Last Modified

April 9, 2026

References (1)

security@joomlahttps://developer.joomla.org/security-centre/1027-20260301-core-acl-hardening-in-com-ajax.html

Weakness Classification(1)

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

CWE-284Improper Access Control

Data Freshness Timeline

(refreshed 5× in last 7d / 8× 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.

2026-05-27 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
2026-05-20 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-2026-21629?

CVE-2026-21629 is a high vulnerability published on April 1, 2026. The ajax component was excluded from the default logged-in-user check in the administrative area. This behavior was potentially unexpected by 3rd party developers.

When was CVE-2026-21629 disclosed?

CVE-2026-21629 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-2026-21629 actively exploited?

CVE-2026-21629 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-2026-21629?

CVE-2026-21629 has a CVSS v3 base score of 7.3 (NVD).

How do I remediate CVE-2026-21629?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21629, 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-2026-21629

📅 Published

🔄 Last Modified

🔗 References (1)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-21629?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (1)

Frequently asked(5)

Related CVEs(same CWE)