CVE-2026-77167 Abusing the federated share endpoint, an attacker can write arbitrary rows into the oc_share_external database table.
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-77167?
CVE-2026-77167 is a high-severity vulnerability in Nextcloud server, published on 27 Oct 2026.
Official description
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.
Weakness: CWE-400
Which versions are affected by CVE-2026-77167?
How do I fix CVE-2026-77167?
No fix has been published for CVE-2026-77167 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-77167 being exploited?
There is no known exploitation of CVE-2026-77167 in the wild and no public exploit code.