CVE-2023-45149Network attack vector

Conversation-password disclosure via uncounted validation attempts

Published Oct 16, 2023 · Updated Sep 16, 2024

Improper brute-force protection in affected Nextcloud Talk releases allows remote authenticated users to discover public-conversation passwords. The page index controller exposes a password-validation path that checks a public conversation password without registering failed attempts with the brute-force limiter. A low-privilege account and a password-protected public conversation are required; repeated guesses can expose that conversation's protected contents.

CVSS severity4.3
Medium
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper brute-force protection in affected Nextcloud Talk releases allows remote authenticated users to discover public-conversation passwords. The page index controller exposes a password-validation path that checks a public conversation password without registering failed attempts with the brute-force limiter. A low-privilege account and a password-protected public conversation are required; repeated guesses can expose that conversation's protected contents.

The record

CVE
CVE-2023-45149
Published
Oct 16, 2023
Updated
Sep 16, 2024
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-307, T1110
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=>= 15.0.0, < 15.0.8
  2. Affected versionversion=>= 16.0.0, < 16.0.6
  3. Affected versionversion=>= 17.0.0, < 17.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=>= 15.0.0, < 15.0.8; version=>= 16.0.0, < 16.0.6; version=>= 17.0.0, < 17.1.1

Published CVSS scores

4.3GitHub, Inc.CVSS: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.

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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-307Improper Restriction of Excessive Authentication Attempts
T1110Brute Force

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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