CVE-2026-92537 json
Newsletter <= 9.3.9 - Unauthenticated Insufficiently Protected Credentials via '/tnp/l/' Click-Tracking REST Endpoint (Raw Subscriber Token Cookie Disclosure)
published 2026-10-01 39 d ago modified 2026-10-01 38 d ago also EUVD-2026-90455
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 25%
- public exploits
- 0
- none known
Summary
The Newsletter – Send awesome emails from WordPress plugin for WordPress is vulnerable to Insufficiently Protected Credentials in all versions up to, and including, 9.3.9 The plugin's public click-tracking REST route `/tnp/l/` is registered with `permission_callback => '__return_true'` and, upon receiving a valid keyed-MD5 signature, calls `set_user_cookie()`, which emits a `Set-Cookie: newsletter=<id>-<raw_token>` response header to the requester because the subscriber object loaded via `get_user()` lacks the `_trusted` property, causing `get_user_key()` to return the raw token column value instead of its MD5-masked variant. This makes it possible for unauthenticated attackers who obtain any signed click-tracking URL for a target subscriber to receive that subscriber's permanent raw authentication cookie, which they can then use to export the subscriber's full PII record via the JSON profile-export endpoint (`?na=px`), rewrite the subscriber's stored profile (`?na=ps`), and silently unsubscribe the subscriber via the RFC-8058 one-click endpoint (`?na=ocu`), none of which require a nonce, password, or email challenge. Signed tracking URLs are embedded in every external link of every newsletter delivered to a subscriber, carry no timestamp, and never expire until the site's relink key rotates, meaning that any party who observes such a URL — through a forwarded email, a shared inbox, a mail-gateway log, or Referer headers on the redirect target, which has no Referrer-Policy set — can replay it indefinitely to obtain the victim's credential.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 38 d ago
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected products
- satollo Newsletter – Send awesome emails from WordPress
Classification
- Weakness
-
- CWE-522 Insufficiently Protected Credentials
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/ed68a4ff-a2aa-4df7-96b1-f094bce4b9b7?source=cve
- plugins.trac.wordpress.org /browser/newsletter/tags/9.3.9/statistics/statistics.php#L174
- plugins.trac.wordpress.org /browser/newsletter/tags/9.3.9/includes/module.php#L403
- plugins.trac.wordpress.org /browser/newsletter/tags/9.3.9/includes/module-base.php#L441
- plugins.trac.wordpress.org /browser/newsletter/tags/9.3.9/statistics/statistics.php#L107
- plugins.trac.wordpress.org /browser/newsletter/tags/9.3.9/statistics/statistics.php#L335
- plugins.trac.wordpress.org /browser/newsletter/tags/9.3.9/includes/module-base.php#L1209
- plugins.trac.wordpress.org /changeset?reponame=&new=3709894%40newsletter%2Ftags%2F9.4.0&old=3695457%40newsletter%2Ftags%2F9.3.9
Sources
- CVE List CVE-2026-92537
- NVD CVE-2026-92537
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.