CVE-2022-24888Network attack vector

Deceptive filenames via validation after trimming

Published Apr 27, 2022 · Updated Apr 23, 2025

Input validation in Nextcloud Server allows remote authenticated users to create names with leading or trailing control characters. The verifyPosixPath method trimmed each filename before scanForInvalidCharacters examined it, removing edge characters from the validation input. Affected branches are 20.x before 20.0.14.4, 21.x before 21.0.8, 22.x before 22.2.4, and 23.x before 23.0.1; published evidence demonstrates deceptive file or folder creation, not downstream code execution.

CVSS severity4.3
Medium
EPSS probability1.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Input validation in Nextcloud Server allows remote authenticated users to create names with leading or trailing control characters. The verifyPosixPath method trimmed each filename before scanForInvalidCharacters examined it, removing edge characters from the validation input. Affected branches are 20.x before 20.0.14.4, 21.x before 21.0.8, 22.x before 22.2.4, and 23.x before 23.0.1; published evidence demonstrates deceptive file or folder creation, not downstream code execution.

The record

CVE
CVE-2022-24888
Published
Apr 27, 2022
Updated
Apr 23, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-74, CWE-93, T1565
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 27, 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

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=< 20.0.14.4
  2. Affected versionversion=< 21.0.8
  3. Affected versionversion=< 22.2.4
  4. Affected versionversion=< 23.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=< 20.0.14.4; version=< 21.0.8; version=< 22.2.4; version=< 23.0.1

Published CVSS scores

4.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/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-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')
T1565Data Manipulation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo