Newsletters < 4.17 — Insufficient Authorization
CVE-2026-17520Published · Updated Action summary
Affected: <4.17Update to 4.17 or newer
All remediation steps- Severity
- Medium5.3
- CVSS
- 5.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Newsletters newsletters-lite
- Affected< 4.17
- Patched in4.17
Update to 4.17 or newer.
You are affected if you run < 4.17. Version 4.17 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Newsletters.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 4.17, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Newsletters to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Erwan LR.
The Newsletters plugin for WordPress is vulnerable to unauthorized access due to insufficient randomization of API keys in all versions up to 4.17 (exclusive). This makes it possible for unauthenticated attackers to access API routes through brute force.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Newsletters
All 46| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.5 | Authenticated (Subscriber+) SQL Injection via 'user_email' User Meta ≤4.18.2Update to 4.18.3 | CVE-2026-122063 | |
| Medium5.3 | Authenticated (Subscriber+) SQL Injection via 'id' Parameter ≤4.18.1Update to 4.18.2 | CVE-2026-101325 | |
| Medium4.3 | Cross-Site Request Forgery ≤4.18.2No patch available | CVE-2026-116863 | |
| High8.1 | Unauthenticated PHP Object Injection ≤4.18.1Update to 4.18.2 | CVE-2026-94075 | |
| High7.5 | Unauthenticated SQL Injection ≤4.18.1Update to 4.18.2 | CVE-2026-111402 |
- Medium6.5Authenticated (Subscriber+) SQL Injection via 'user_email' User Meta
≤4.18.2Update to 4.18.3
- Medium5.3Authenticated (Subscriber+) SQL Injection via 'id' Parameter
≤4.18.1Update to 4.18.2
- Medium4.3Cross-Site Request Forgery
≤4.18.2No patch available
- High8.1Unauthenticated PHP Object Injection
≤4.18.1Update to 4.18.2
- High7.5Unauthenticated SQL Injection
≤4.18.1Update to 4.18.2
Timeline
CVE published
Severity medium, CVSS 5.3
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.