CVE-2022-39339Network attack vector

Credential disclosure via unencrypted OIDC login flow

Published Nov 25, 2022 · Updated Apr 23, 2025

Cleartext transmission in Nextcloud user_oidc before 1.2.1 allows context-dependent attackers to capture OIDC credentials and tokens. The LoginController login and code endpoints accepted HTTP requests, allowing the OIDC flow to send client credentials and tokens without TLS. Exploitation requires access to monitor traffic between a user and an HTTP-served Nextcloud instance, exposing account credentials without directly interrupting service.

CVSS severity4.3
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext transmission in Nextcloud user_oidc before 1.2.1 allows context-dependent attackers to capture OIDC credentials and tokens. The LoginController login and code endpoints accepted HTTP requests, allowing the OIDC flow to send client credentials and tokens without TLS. Exploitation requires access to monitor traffic between a user and an HTTP-served Nextcloud instance, exposing account credentials without directly interrupting service.

The record

CVE
CVE-2022-39339
Published
Nov 25, 2022
Updated
Apr 23, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-319, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=< 1.2.1

Published CVSS scores

3.5NextcloudCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
4.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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