CVE-2023-5660Network attack vector

Stored XSS via unsanitized shortcode attributes

Published Nov 7, 2023 · Updated Apr 8, 2026

Stored cross-site scripting in SendPress Newsletters through 1.22.3.31 lets remote authenticated contributors inject scripts via shortcode attributes. Shortcode attribute values are accepted without sufficient sanitization and are emitted without adequate output escaping, so injected JavaScript is stored in pages and runs when a visitor opens them. Contributor-level or higher WordPress access is required; the impact is script execution in a visitor's browser with confidentiality and integrity effects but no reported service interruption.

CVSS severity6.4
Medium
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored cross-site scripting in SendPress Newsletters through 1.22.3.31 lets remote authenticated contributors inject scripts via shortcode attributes. Shortcode attribute values are accepted without sufficient sanitization and are emitted without adequate output escaping, so injected JavaScript is stored in pages and runs when a visitor opens them. Contributor-level or higher WordPress access is required; the impact is script execution in a visitor's browser with confidentiality and integrity effects but no reported service interruption.

The record

CVE
CVE-2023-5660
Published
Nov 7, 2023
Updated
Apr 8, 2026
Vendor
SendPress
Product
SendPress Newsletters
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 7, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.22.3.31

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SendPress · SendPress Newslettersversion=0 <=1.22.3.31

Published CVSS scores

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

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo