CVE-2026-12938Network attack vector

Stored XSS via unescaped shortcode target

Published Jul 29, 2026 · Updated Jul 29, 2026

Stored XSS in Tribulant Software Newsletters 4.15 and earlier allows remote authenticated users to inject scripts via a shortcode. The posts_single() function copies the attacker-controlled target attribute into $wpml_target, and shortcode_posts() inserts it into a post-thumbnail target attribute without esc_attr(). Contributor-level access is sufficient to store script that executes when a visitor opens the affected page.

CVSS severity6.4
Medium
EPSS probability0.21%
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 Tribulant Software Newsletters 4.15 and earlier allows remote authenticated users to inject scripts via a shortcode. The posts_single() function copies the attacker-controlled target attribute into $wpml_target, and shortcode_posts() inserts it into a post-thumbnail target attribute without esc_attr(). Contributor-level access is sufficient to store script that executes when a visitor opens the affected page.

The record

CVE
CVE-2026-12938
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
Tribulant Software
Product
Newsletters
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 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 <=4.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Tribulant Software · Newslettersversion=0 <=4.15

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.

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 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.

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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