CVE-2022-4544Public exploitNetwork attack vector

Stored script execution via unescaped shortcode size

Published Jan 16, 2023 · Updated Apr 4, 2025

Stored XSS in the MashShare WordPress plugin before 3.8.7 allows remote authenticated users to run scripts in administrators' browsers. The mashshare shortcode emits its size attribute into page markup without validating or escaping embedded event-handler syntax. Contributor-level access is sufficient to store a crafted shortcode, and execution requires a higher-privileged user to view the affected page.

CVSS severity5.4
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the MashShare WordPress plugin before 3.8.7 allows remote authenticated users to run scripts in administrators' browsers. The mashshare shortcode emits its size attribute into page markup without validating or escaping embedded event-handler syntax. Contributor-level access is sufficient to store a crafted shortcode, and execution requires a higher-privileged user to view the affected page.

The record

CVE
CVE-2022-4544
Published
Jan 16, 2023
Updated
Apr 4, 2025
Vendor
René Hermenau
Product
MashShare
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 4, 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=0 <3.8.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

René Hermenau · MashShareversion=0 <3.8.7

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Cross-Site Scripting (XSS)
T1203Exploitation for Client Execution

Public exploit references

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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