CVE-2026-16268: Newsletters < 4.16 - Unauthenticated Server-Side Request Forgery via SNS Bounce Handler
Vulnerability summary
CVE-2026-16268 is a high (CVSS 8.2) Server-Side Request Forgery (SSRF) vulnerability in unknown newsletters. EPSS estimates a 0.73% chance of exploitation in the next 30 days, higher than 53.9% of scored vulnerabilities. 1 public exploit is recorded. Fixed in 4.16.
Timeline
- 06-08-2026PublishedVulnerability first disclosed.
- 06-08-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 3 sources · 1 version- NVDNIST8.2HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
- wordfenceSource7.2HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:NDiffers
EPSS trend
Probability
0.73%
Chance of exploitation in the next 30 days
Percentile
54%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.73% on 24-09-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (wpscan.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Unknown1 product
- newsletters< 4.16
Wordpress1 product
- newsletters-lite≤ 4.15 (fixed in 4.16)
2 vendors · 2 products