CVE-2023-33184

Blind SSRF in the Nextcloud Mail app on avatar endpoint

MEDIUM

5.3

CVSS Score

Published: May 27, 2023 at 04:36 AM UTC

Updated: June 17, 2026 at 06:01 AM UTC

1 product affected across 1 vendorMail

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Severity

MEDIUM5.3

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

Description

Nextcloud Mail is a mail app in Nextcloud. A blind SSRF attack allowed to send GET requests to services running in the same web server. It is recommended that the Mail app is update to version 3.02, 2.2.5 or 1.15.3.

Affected

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

Mail · Nextcloudnextcloud-app

95%

1.13.0 ≤ v < 1.15.32.2.0 ≤ v < 2.2.52.3.0 ≤ v < 3.0.2

Affected range stops below 1.15.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.2.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.0.2, 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:

Patch and advisory references

References (3)

x_refsource_MISCPatch

Source: [email protected]

https://github.com/nextcloud/mail/pull/8275

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8gph-9895-w564

x_refsource_MISCIssue Tracking

Source: [email protected]

https://hackerone.com/reports/1913095

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

5.3MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-918

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