CVE-2023-45660

Require strict cookies for image proxy requests in Nextcloud Mail

MEDIUM
4.3
CVSS Score
Published: October 16, 2023 at 06:32 PM UTC
Updated: June 17, 2026 at 06:29 AM UTC
1 product affected across 1 vendorMail

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mail· Nextcloudnextcloud-app
95%
2.2.0 ≤ v < 2.2.83.0.0 ≤ v < 3.3.0
Affected range stops below 2.2.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.3.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-918

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