CVE-2019-15611Network attack vector

Credential disclosure via cross-service request leakage

Published Feb 4, 2020 · Updated Aug 5, 2024

Credential disclosure in Nextcloud iOS Client 2.23.0 allows remote attackers operating a contacted service to read login data and tokens. During federated-user searches and push registration, the client sends account credentials to other Nextcloud services instead of limiting them to the configured server. An account must be configured and one of those network features invoked, after which the receiving service obtains the exposed login and token.

CVSS severity4.9
Medium
EPSS probability1.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential disclosure in Nextcloud iOS Client 2.23.0 allows remote attackers operating a contacted service to read login data and tokens. During federated-user searches and push registration, the client sends account credentials to other Nextcloud services instead of limiting them to the configured server. An account must be configured and one of those network features invoked, after which the receiving service obtains the exposed login and token.

The record

CVE
CVE-2019-15611
Published
Feb 4, 2020
Updated
Aug 5, 2024
Vendor
Nextcloud GmbH
Product
Nextcloud iOS Client
Classifications
CWE-657, T1635
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 4, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record 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=2.23.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Nextcloud iOS Clientversion=2.23.0

Published CVSS scores

4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:P/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-657Violation of Secure Design Principles
T1635Steal Application Access Token

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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