CVE-2024-22400Network attack vector

Open redirect via unvalidated SAML RelayState

Published Jan 18, 2024 · Updated Jun 17, 2025

Open redirect in Nextcloud User Saml 5.0.0 through 5.1.4, 5.2.0 through 5.2.4, and 6.0.0 allows remote attackers to redirect users via RelayState. The assertion consumer uses a RelayState value as the post-authentication HTTP redirect target without restricting it to a trusted Nextcloud URL. Exploitation requires a victim to follow an attacker-supplied link and complete the SAML flow, after which the browser reaches an attacker-controlled site.

CVSS severity3.1
Low
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Nextcloud User Saml 5.0.0 through 5.1.4, 5.2.0 through 5.2.4, and 6.0.0 allows remote attackers to redirect users via RelayState. The assertion consumer uses a RelayState value as the post-authentication HTTP redirect target without restricting it to a trusted Nextcloud URL. Exploitation requires a victim to follow an attacker-supplied link and complete the SAML flow, after which the browser reaches an attacker-controlled site.

The record

CVE
CVE-2024-22400
Published
Jan 18, 2024
Updated
Jun 17, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 5.0.0, < 5.1.5
  2. Affected versionversion=>= 5.2.0, < 5.2.5
  3. Affected versionversion=>= 6.0.0, < 6.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=>= 5.0.0, < 5.1.5; version=>= 5.2.0, < 5.2.5; version=>= 6.0.0, < 6.0.1

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/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-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001Malicious Link

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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