CVE-2023-37303

CRITICALNVD 9.89.8—Elevated

9.8

An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to block a user fails after a temporary browser hang and a DBQueryDisconnectedError error message.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 47.7%
KEV: Not listed

Published

June 30, 2023

Last Modified

November 27, 2024

References (4)

cve@mitrehttps://gerrit.wikimedia.org/r/q/I10a9273c542576b3f7bb38de68dcd2aa41cfb1b0
cve@mitrehttps://phabricator.wikimedia.org/T338276
af854a3a-2127-422b-91ae-364da2661108https://gerrit.wikimedia.org/r/q/I10a9273c542576b3f7bb38de68dcd2aa41cfb1b0
af854a3a-2127-422b-91ae-364da2661108https://phabricator.wikimedia.org/T338276

Weakness Classification(1)

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

CWE-754

Data Freshness Timeline

(refreshed 14× in last 7d / 20× 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.

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Frequently asked(5)

What is CVE-2023-37303?

CVE-2023-37303 is a critical vulnerability published on June 30, 2023. An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to block a user fails after a temporary browser hang and a DBQueryDisconnectedError error message.

When was CVE-2023-37303 disclosed?

CVE-2023-37303 was first published in the National Vulnerability Database on June 30, 2023, with the most recent update on November 27, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-37303 actively exploited?

CVE-2023-37303 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 47.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-37303?

CVE-2023-37303 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2023-37303?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-37303, 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-2023-37303

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-37303?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (4)

Frequently asked(5)

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