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CVE-2026-16268

HIGH 8.2 PoC AVAILABLE

Published 2026-08-06 · Last modified 2026-08-06

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.

EXPLOIT AVAILABLE

Public exploit or PoC code exists. Modeled probability is still low, but the barrier to attack is reduced — watch closely.

Exploitation likelihood

0.4%chance of exploitation in 30 days · 37th percentile

○ In CISA KEV ● Public exploit / PoC

Impact if exploited

8.2CVSS 3.1 · HIGH

  • ConfidentialityLow
  • IntegrityHigh
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

Test against your own equipment

nuclei -id CVE-2026-16268 -u https://TARGETDetection template — non-destructive check that a target is affected.
curl -s https://vulnpedia.com/cve/CVE-2026-16268/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-16268/poc.json

Affected

Vendors Unknown

Products Newsletters

Weakness (CWE)

  • CWE-918: Server-Side Request Forgery (SSRF)

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

All CVSS metrics

  • HIGH 8.2 v3.1 · ADP Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
  • HIGH 8.2 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

References

Exploits & PoC

Sources: NVD · CVE.org · EPSS