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VulnerabilityPublished

CVE-2026-86824: Newsletter (WordPress plugin) · Inadequate Encryption Strength

Affects Newsletter (WordPress plugin)Source CVE Database V5

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Not known to be exploited · CVSS 4.8 Medium : upgrade to 9.3.8 when convenient.

Data as of 1 Nov 2026, 22:58 UTC

CVSS 3.1 base score
4.8Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 9.3.8
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 17 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 1 Nov 2026.

What to do

Upgrade Newsletter (WordPress plugin) to 9.3.8.

Affected software

ProductAffectedFixed in
NewsletterAffected
  • <9.3.8
Fixed in
  • 9.3.8

AI-suggested

Upgrade the Newsletter plugin to version 9.3.8 or later, where this vulnerability has been addressed by improving the entropy used for key generation and securing the signing process of tracking links.

Description

The Newsletter WordPress plugin before 9.3.8 does not generate its email tracking signing key with sufficient entropy and signs its tracking links with an unkeyed hash, allowing an unauthenticated attacker who recovers that key offline to forge tracking links, obtain any subscriber's session token, and read and modify that subscriber's stored personal data.

References

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