CVE-2026-75908Network attack vector

Author-level mass mailing via forged role selection

Published Aug 25, 2026 · Updated Aug 25, 2026

Authorization bypass in Tribulant Software Newsletters 4.17 and earlier allows remote authenticated users to send arbitrary newsletters. The post-save handler passes the attacker-controlled newsletters_mailinglistsroles POST value directly to get_users() without verifying the sender's authority. Author-level access is sufficient to target any WordPress role, enabling mass mailing and phishing through the site's outbound email channel.

CVSS severity4.3
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Tribulant Software Newsletters 4.17 and earlier allows remote authenticated users to send arbitrary newsletters. The post-save handler passes the attacker-controlled newsletters_mailinglistsroles POST value directly to get_users() without verifying the sender's authority. Author-level access is sufficient to target any WordPress role, enabling mass mailing and phishing through the site's outbound email channel.

The record

CVE
CVE-2026-75908
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
Tribulant Software
Product
Newsletters
Classifications
CWE-862, T1566
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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 <=4.17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Tribulant Software · Newslettersversion=0 <=4.17

Published CVSS scores

4.3WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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-862Missing Authorization
T1566Phishing

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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