Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, webauthn tokens were not deleted after a user has been deleted. If a victim reused an earlier used username, the previous user could gain access to their account. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.
CVE-2021-32726
HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 7.1 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 32% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 7.1Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.1
- EG Score
- 7.1(medium)
- EPSS
- 75.6%
- KEV
- Not listed
Published
July 12, 2021
Last Modified
November 21, 2024
References (8)
- security-advisories@githubhttps://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg
- security-advisories@githubhttps://github.com/nextcloud/server/pull/27532
- security-advisories@githubhttps://hackerone.com/reports/1202590
- security-advisories@githubhttps://security.gentoo.org/glsa/202208-17
- af854a3a-2127-422b-91ae-364da2661108https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg
- af854a3a-2127-422b-91ae-364da2661108https://github.com/nextcloud/server/pull/27532
- af854a3a-2127-422b-91ae-364da2661108https://hackerone.com/reports/1202590
- af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202208-17
Frequently asked(5)
What is CVE-2021-32726?
CVE-2021-32726 is a high vulnerability published on July 12, 2021. Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, webauthn tokens were not deleted after a user has been deleted. If a victim reused an earlier used username, the previous user could gain access to their account. The issue was fixed…
When was CVE-2021-32726 disclosed?
CVE-2021-32726 was first published in the National Vulnerability Database on July 12, 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-2021-32726 actively exploited?
CVE-2021-32726 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 75.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-32726?
CVE-2021-32726 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2021-32726?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-32726, 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
Explore the affected products and dependency analysis for CVE-2021-32726
Is Your Infrastructure Affected by CVE-2021-32726?
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