BIT-nextcloud-2026-77164
Circles' remote-instance signature verification fetches the attacker-supplied keyId URL before trust in the remote instance is established, and explicitly allows local/private addresses for this request, bypassing Nextcloud's core SSRF protections. The public, unauthenticated endpoints POST /apps/circles/event/ and POST /apps/circles/incoming/ reach this code path, allowing any unauthenticated user to force the server to issue a GET request to an internal address. The response body of the internal request is never returned to the requester, so this is blind SSRF: an attacker can determine whether an internal service is reachable, but cannot read its response contents through this endpoint alone.
BIT-nextcloud-2026-77164
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:BIT-nextcloud-2026-77164
nextcloud
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 34.0.1
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "31.0.0"
},
{
"fixed": "34.0.1"
}
]
}
],
"package": {
"name": "nextcloud",
"purl": "pkg:bitnami/nextcloud",
"ecosystem": "Bitnami"
},
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
}
],
"database_specific": {
"source": "https://github.com/bitnami/vulndb/tree/main/data/nextcloud/BIT-nextcloud-2026-77164.json"
}
}
]- Related CVEs
- CVE-2026-77164
Source reference:
/aliases
Publisher severity
medium
Source reference: /database_specific/severity
- Event
- #15221 · Revision 1
- Added to Heist Feed
- Publisher date