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TI-2023-24461 Aliases CVE-2023-45660

Require strict cookies for image proxy requests in Nextcloud Mail

Priority LOW 21CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00759 55th percentileScored 2026-11-07
Fix Fixed security-advisories (nextcloud): 2.2.8, 3.3.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nextcloudsecurity-advisories2.0.0 to before 2.2.8; 3.0.0 to before 3.3.02.2.8, 3.3.0Patch availableCNA
  • security-advisories Vendornextcloud Affected 2.0.0 to before 2.2.8; 3.0.0 to before 3.3.0 Fixed in 2.2.8, 3.3.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nextcloud:mail:*:*:*:*:*:*:*:*2.2.0 to before 2.2.8; 3.0.0 to before 3.3.0Vulnerablenextcloud
  • cpe:2.3:a:nextcloud:mail:*:*:*:*:*:*:*:* Versions 2.2.0 to before 2.2.8; 3.0.0 to before 3.3.0 Vulnerable ·nextcloud

Remediation

  • Fix · CNA security-advisories (nextcloud) Fixed in 2.2.8, 3.3.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-45660
  2. 2026-10-18 EPSS moved to the 50th–90th percentile

References

Patch 1

Advisory 2

  • TI-2023-09741 Blind SSRF via server URL input in the Nextcloud Mail app CVSS 3.1MEDIUM 5.0
  • TI-2022-13176 Unauthenticated SSRF in 3rd party module "cerdic/csstidy" CVSS 3.1CRITICAL 9.8
  • TI-2023-26170 Nextcloud Mail app vulnerable to Server-Side Request Forgery CVSS 3.1CRITICAL 9.8
  • TI-2021-12320 Missing permission check on email metadata retrieval CVSS 3.1HIGH 8.8
  • TI-2024-35179 Nextcloud Mail auto configurator can be tricked into sending account information to wrong servers CVSS 3.1HIGH 8.2
  • TI-2020-06574 A missing verification of the TLS host in Nextcloud Mail 1.1.3 allowed a man in the middle attack. CVSS 3.1HIGH 7.0
See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences