CVE-2026-16268
HighPublic exploitThe Newsletters WordPress plugin before 4.16 does not authenticate or validate a bounce-processing request before fetching a user-supplied URL on the server side, allowing unauthenticated attackers to make the site issue requests to arbitrary internal or external hosts.
Published Aug 6, 2026 · Updated Aug 26, 2026 · Also known as EUVD-2026-53723, GHSA-mhrm-79mh-vhfj, b0f9242c-88da-4d94-9c32-26cce745b48b
Key Facts
Patch immediately- CVE-2026-16268 is a high-severity vulnerability (CVSS 8.2 v3.1) affecting newsletters-lite (wordpress-plugin), Newsletters.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 0.7% probability of exploitation in the next 30 days.
- Fixed versions are available, including Newsletters 4.16, newsletters-lite 4.16.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
CVSS v3.1
8.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
EPSS (30-day exploit likelihood)
0.7%
Higher than 53.4% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-16268 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
The Newsletters WordPress plugin before 4.16 does not authenticate or validate a bounce-processing request before fetching a user-supplied URL on the server side, allowing unauthenticated attackers to make the site issue requests to arbitrary internal or external hosts.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| newsletters-litewordpress-plugin | See advisory | 4.16 |
| Newsletters | See advisory | 4.16 |
Patched Releases
Newsletters
4.16
newsletters-lite
4.16
Timeline
Publicly disclosed
Aug 6, 2026
Last updated
Aug 26, 2026
Weakness Type
- CWE-918 Server-Side Request Forgery (SSRF)
References
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/b0f9242c-88da-4d94-9c32-26cce745b48b?source=api-prod
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/b0f9242c-88da-4d94-9c32-26cce745b48b?source=api-scan
- otherhttps://wpscan.com/vulnerability/65612dd4-83d8-40c5-8e12-862e9b5f940b/
FAQ
Common Questions.
The Newsletters WordPress plugin before 4.16 does not authenticate or validate a bounce-processing request before fetching a user-supplied URL on the server side, allowing unauthenticated attackers to make the site issue requests to arbitrary internal or external hosts.
Affected: newsletters-lite (wordpress-plugin); Newsletters. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Newsletters 4.16, newsletters-lite 4.16.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
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