CVE-2021-42548Network attack vector

Reflected XSS via unvalidated search input

Published Dec 13, 2021 · Updated Aug 4, 2024

Reflected XSS in Share-one-Drive before 1.15.3 allows remote attackers to inject script through the WordPress plugin search function. Public records identify insufficient input validation in the search function but do not disclose the affected parameter or missing output-encoding operation. A victim must open the crafted search request; the reflected script then executes in the WordPress site context and can perform attacker-chosen page actions.

CVSS severity4.7
Medium
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Share-one-Drive before 1.15.3 allows remote attackers to inject script through the WordPress plugin search function. Public records identify insufficient input validation in the search function but do not disclose the affected parameter or missing output-encoding operation. A victim must open the crafted search request; the reflected script then executes in the WordPress site context and can perform attacker-chosen page actions.

The record

CVE
CVE-2021-42548
Published
Dec 13, 2021
Updated
Aug 4, 2024
Vendor
WP Cloud Plugins
Product
Share-one-Drive
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=unspecified <1.15.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WP Cloud Plugins · Share-one-Driveversion=unspecified <1.15.3

Published CVSS scores

4.7Switzerland Government Common Vulnerability ProgramCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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