CVE-2023-5337Network attack vector

Stored XSS via unescaped shortcode attributes

Published Oct 20, 2023 · Updated Apr 8, 2026

Stored XSS in FormForAll Contact form plugin 1.2 and earlier allows remote authenticated users to inject scripts via shortcode attributes. The formforall shortcode handler accepts user-supplied attributes without sufficient input sanitization and emits them without sufficient output escaping. Contributor-level access is sufficient, and the stored script executes whenever a visitor opens the injected page.

CVSS severity6.4
Medium
EPSS probability0.34%
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 FormForAll Contact form plugin 1.2 and earlier allows remote authenticated users to inject scripts via shortcode attributes. The formforall shortcode handler accepts user-supplied attributes without sufficient input sanitization and emits them without sufficient output escaping. Contributor-level access is sufficient, and the stored script executes whenever a visitor opens the injected page.

The record

CVE
CVE-2023-5337
Published
Oct 20, 2023
Updated
Apr 8, 2026
Vendor
FormForAll
Product
Contact form Form For All – Easy to use, fast, 37 languages.
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record 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 <=1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FormForAll · Contact form Form For All – Easy to use, fast, 37 languages.version=0 <=1.2

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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 exploitUnconfirmed

Weakness, pattern, technique

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

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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