CVE-2026-1051Network attack vector

Forced subscriber unsubscription via missing nonce validation

Published Jan 20, 2026 · Updated Jan 20, 2026

Cross-site request forgery in Newsletter 9.1.0 and earlier allows remote attackers to unsubscribe subscribers through a forged request. The hook_newsletter_action() function processes the newsletter action without correctly validating a nonce before changing subscription state. Exploitation requires a logged-in user to follow an attacker-controlled link, and the demonstrated consequence is newsletter unsubscription.

CVSS severity4.3
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in Newsletter 9.1.0 and earlier allows remote attackers to unsubscribe subscribers through a forged request. The hook_newsletter_action() function processes the newsletter action without correctly validating a nonce before changing subscription state. Exploitation requires a logged-in user to follow an attacker-controlled link, and the demonstrated consequence is newsletter unsubscription.

The record

CVE
CVE-2026-1051
Published
Jan 20, 2026
Updated
Jan 20, 2026
Vendor
Stefano Lissa
Product
Newsletter
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 20, 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=* <=9.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Stefano Lissa · Newsletterversion=* <=9.1.0

Published CVSS scores

4.3WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001Malicious Link

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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