CVE-2025-66550

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Source
https://cve.org/CVERecord?id=CVE-2025-66550
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-66550.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-66550
Aliases
  • GHSA-f29c-ppmv-8mcv
Published
2025-12-05T16:56:44Z
Modified
2026-08-12T03:51:22Z
Severity
  • 5.7 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N CVSS Calculator
Summary
Nextcloud Calendar attachments of local files are offered to downloaded
Details

Nextcloud Calendar is a calendar app for Nextcloud. Prior to 4.7.17 and 5.2.4, when a malicious user creates a calendar event with a crafted attachment that links to a download link of a file on the same Nextcloud server, the file would be downloaded without the user confirming the action. This vulnerability is fixed in 4.7.17 and 5.2.4.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-241"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66550.json"
}
References

Affected packages

Git / github.com/nextcloud/calendar

Affected ranges

Type
GIT
Repo
https://github.com/nextcloud/calendar
Events
Introduced
d840d46412d121c9ae2697efed7f1ce6dd414fc2
Fixed
44423c0b8f0d903102f2bbf7a12808b8ac3da64d
Introduced
31203fddf125223d25f3b8b0d520f567a998e8af
Fixed
f823d93dd3ac0b759c24c769832277bf94e3081d
Fixed
63a6c398db01391eb9fd5297a0d4c3d6e614f769
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "4.0.0"
        },
        {
            "fixed": "4.7.17"
        },
        {
            "introduced": "5.0.0"
        },
        {
            "fixed": "5.2.4"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-66550.json"