CVE-2024-22403Network attack vector

Authentication bypass via nonexpiring OAuth authorization codes

Published Jan 18, 2024 · Updated Jun 17, 2025

OAuth code expiration failure in Nextcloud Server 26.0.0 through 26.0.10 and 27.0.0 through 27.1.5 allows attackers to authenticate with OAuth codes. The OAuth2 token endpoint accepted authorization codes stored in oauth2_access_tokens without checking their creation time or an expiration window. Exploitation requires interception of a user's code, after which that code remains redeemable indefinitely for access associated with the authorization grant.

CVSS severity3.0
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

OAuth code expiration failure in Nextcloud Server 26.0.0 through 26.0.10 and 27.0.0 through 27.1.5 allows attackers to authenticate with OAuth codes. The OAuth2 token endpoint accepted authorization codes stored in oauth2_access_tokens without checking their creation time or an expiration window. Exploitation requires interception of a user's code, after which that code remains redeemable indefinitely for access associated with the authorization grant.

The record

CVE
CVE-2024-22403
Published
Jan 18, 2024
Updated
Jun 17, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-613, T1078
Attack vector
network
Privileges
authenticated

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

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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=< 28.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=< 28.0.0

Published CVSS scores

3.7NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
3.0GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/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-613Insufficient Session Expiration
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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