CVE-2018-3761

HIGHNVD 8.18.1—

8.1

Nextcloud Server before 12.0.8 and 13.0.3 suffer from improper authentication on the OAuth2 token endpoint. Missing checks potentially allowed handing out new tokens in case the OAuth2 client was partly compromised.

CVSS v3: 8.1
EG Score: 8.1(medium)
EPSS: 69.7%
KEV: Not listed

Published

July 5, 2018

Last Modified

November 21, 2024

References (4)

support@hackeronehttps://hackerone.com/reports/343111
support@hackeronehttps://nextcloud.com/security/advisory/?id=nc-sa-2018-003
af854a3a-2127-422b-91ae-364da2661108https://hackerone.com/reports/343111
af854a3a-2127-422b-91ae-364da2661108https://nextcloud.com/security/advisory/?id=nc-sa-2018-003

Weakness Classification(1)

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

CWE-287Improper Authentication

Data Freshness Timeline

(refreshed 11× 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.

2026-06-05 06:08 UTCepss_batch
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2026-06-04 13:10 UTCepss_batch
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2026-05-31 22:29 UTCepss_batch
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2026-05-29 13:41 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
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2026-05-28 05:56 UTCEG score recompute
2026-05-28 05:56 UTCGHSA enrichment
2026-05-27 13:38 UTCepss_batch
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2026-05-26 13:42 UTCepss_batch
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2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2018-3761?

CVE-2018-3761 is a high vulnerability published on July 5, 2018. Nextcloud Server before 12.0.8 and 13.0.3 suffer from improper authentication on the OAuth2 token endpoint. Missing checks potentially allowed handing out new tokens in case the OAuth2 client was partly compromised.

When was CVE-2018-3761 disclosed?

CVE-2018-3761 was first published in the National Vulnerability Database on July 5, 2018, 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-2018-3761 actively exploited?

CVE-2018-3761 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 69.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-3761?

CVE-2018-3761 has a CVSS v3 base score of 8.1 (NVD).

How do I remediate CVE-2018-3761?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-3761, 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-2018-3761

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-3761?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)