{"id":"CVE-2026-92537","state":"PUBLISHED","title":"Newsletter <= 9.3.9 - Unauthenticated Insufficiently Protected Credentials via '/tnp/l/' Click-Tracking REST Endpoint (Raw Subscriber Token Cookie Disclosure)","description":"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.","publishedAt":"2026-10-01T02:27:46.143Z","updatedAt":"2026-10-01T14:21:14.764Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","source":"Wordfence"},"assigner":"Wordfence","products":["satollo Newsletter – Send awesome emails from WordPress"],"affected":[{"vendor":"satollo","product":"Newsletter – Send awesome emails from WordPress","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"9.3.9","versionType":"semver"}]}],"references":["https://www.wordfence.com/threat-intel/vulnerabilities/id/ed68a4ff-a2aa-4df7-96b1-f094bce4b9b7?source=cve","https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/statistics/statistics.php#L174","https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module.php#L403","https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module-base.php#L441","https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/statistics/statistics.php#L107","https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/statistics/statistics.php#L335","https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module-base.php#L1209","https://plugins.trac.wordpress.org/changeset?reponame=&new=3709894%40newsletter%2Ftags%2F9.4.0&old=3695457%40newsletter%2Ftags%2F9.3.9"],"weaknesses":["CWE-522"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/92xxx/CVE-2026-92537.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-92537","state":"PUBLISHED","datePublished":"2026-10-01T02:27:46.143Z","dateUpdated":"2026-10-01T14:21:14.764Z","assignerShortName":"Wordfence","assignerOrgId":"b15e7b5b-3da4-40ae-a43c-f7aa60e62599","dateReserved":"2026-09-16T12:53:23.351Z"},"containers":{"cna":{"title":"Newsletter <= 9.3.9 - Unauthenticated Insufficiently Protected Credentials via '/tnp/l/' Click-Tracking REST Endpoint (Raw Subscriber Token Cookie Disclosure)","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"satollo","product":"Newsletter – Send awesome emails from WordPress","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"9.3.9","versionType":"semver"}]}],"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/ed68a4ff-a2aa-4df7-96b1-f094bce4b9b7?source=cve"},{"url":"https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/statistics/statistics.php#L174"},{"url":"https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module.php#L403"},{"url":"https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module-base.php#L441"},{"url":"https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/statistics/statistics.php#L107"},{"url":"https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/statistics/statistics.php#L335"},{"url":"https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module-base.php#L1209"},{"url":"https://plugins.trac.wordpress.org/changeset?reponame=&new=3709894%40newsletter%2Ftags%2F9.4.0&old=3695457%40newsletter%2Ftags%2F9.3.9"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","baseScore":5.3,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-522","lang":"en","description":"CWE-522 Insufficiently Protected Credentials","type":"CWE"}]}],"providerMetadata":{"shortName":"Wordfence","orgId":"b15e7b5b-3da4-40ae-a43c-f7aa60e62599","dateUpdated":"2026-10-01T02:27:46.143Z"},"credits":[{"lang":"en","type":"finder","value":"Swayam"}],"timeline":[{"time":"2026-09-16T13:37:46.000Z","lang":"en","value":"Vendor Notified"},{"time":"2026-09-30T13:32:34.000Z","lang":"en","value":"Disclosed"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-01T14:21:07.819888Z","id":"CVE-2026-92537","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-01T14:21:14.764Z"}}]}}}