CVE-2026-4920Network attack vector

Stored XSS via unescaped default shortcode output

Published May 12, 2026 · Updated May 12, 2026

Stored XSS in Next Date 1.0 and earlier allows remote authenticated users to inject scripts through the default shortcode attribute. The shortcode processing path accepts the user-supplied default attribute without sanitizing it and emits it without HTML output escaping. Contributor-level access is required to save the payload, which executes in the browser of anyone who opens the affected page.

CVSS severity6.4
Medium
EPSS probability0.19%
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 Next Date 1.0 and earlier allows remote authenticated users to inject scripts through the default shortcode attribute. The shortcode processing path accepts the user-supplied default attribute without sanitizing it and emits it without HTML output escaping. Contributor-level access is required to save the payload, which executes in the browser of anyone who opens the affected page.

The record

CVE
CVE-2026-4920
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Jeremy B. Shapiro
Product
Next Date
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 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 <=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jeremy B. Shapiro · Next Dateversion=0 <=1.0

Published CVSS scores

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.

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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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

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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