CVE-2023-0431Public exploitNetwork attack vector

Contributor-level stored XSS via unescaped class attribute

Published Jun 12, 2023 · Updated Jan 3, 2025

Stored XSS in the File Away shortcode through 3.9.9.0.1 allows remote authenticated users to execute scripts in visitors' browsers. The fileup shortcode emits its class attribute without validation or output escaping, allowing a quote to terminate the value and inject an event handler. Contributor access is sufficient to store the payload in a post, but script execution requires a visitor to render the affected shortcode.

CVSS severity5.4
Medium
EPSS probability0.37%
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 File Away shortcode through 3.9.9.0.1 allows remote authenticated users to execute scripts in visitors' browsers. The fileup shortcode emits its class attribute without validation or output escaping, allowing a quote to terminate the value and inject an event handler. Contributor access is sufficient to store the payload in a post, but script execution requires a visitor to render the affected shortcode.

The record

CVE
CVE-2023-0431
Published
Jun 12, 2023
Updated
Jan 3, 2025
Vendor
Thom Stark
Product
File Away
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 3, 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 <=3.9.9.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Thom Stark · File Awayversion=0 <=3.9.9.0.1

Published CVSS scores

5.4NIST NVDCVSS: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 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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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