Medium severity · published Oct 16, 2023
CVE-2023-45660
Require strict cookies for image proxy requests in Nextcloud Mail
4.3
CVSS
0.8%
EPSS
No
On KEV
Description
Nextcloud mail is an email app for the Nextcloud home server platform. In affected versions a missing check of origin, target and cookies allows for an attacker to abuse the proxy endpoint to denial of service a third server. It is recommended that the Nextcloud Mail is upgraded to 2.2.8 or 3.3.0. There are no known workarounds for this vulnerability.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 55% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
security-advisories · nextcloud
>= 2.0.0, < 2.2.8; >= 3.0.0, < 3.3.0 · source: vendor
MA
Mail · Nextcloud
2.2.0 before 2.2.8; 3.0.0 before 3.3.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-45660
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-45660
Issue Tracking
https://github.com/nextcloud/mail/pull/8459
Vendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8j9x-fmww-qr37
Third Party Advisory
https://hackerone.com/reports/1895874
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