CVE-2026-77167: Nextcloud server vulnerability
Nextcloud · server
Affected: Nextcloud server · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 30% of scored CVEs
DescriptionCVE.org
Abusing the federated share endpoint, an attacker can write arbitrary rows into the oc_share_external database table. These rows persist indefinitely — there is no automatic cleanup mechanism. Three distinct denial-of-service conditions follow from this write primitive, all triggered from the same unauthenticated source and all self-renewing on a 24-hour cycle for as long as the injected rows remain in the database.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Nextcloud · serverfrom 22.0.0 up to and including 34.0.0
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Nextcloud
- Published
- October 2026
- Bounty reports
- 1 disclosed on HackerOne
Disclosed bug bounty reports about CVE-2026-77167
The reports on HackerOne that name this CVE, with HackerOne's own outcome. Titles and metadata only.
- Unauthenticated Persistent Denial-of-Service via Federated Share InjectionNextcloud · 2026 · high severityValid
CoverageNo articles yet
No CyberSIXT article names CVE-2026-77167 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.