Vulnerability-Lookup

GHSA-R57R-XX5C-PCG3

Vulnerability from github – Published: 2026-10-01 03:31 – Updated: 2026-10-01 03:31

Details

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.

Severity

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-92537"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-522"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-01T03:16:59Z",
    "severity": "MODERATE"
  },
  "details": "The Newsletter \u2013 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\u0027s public click-tracking REST route `/tnp/l/` is registered with `permission_callback =\u003e \u0027__return_true\u0027` and, upon receiving a valid keyed-MD5 signature, calls `set_user_cookie()`, which emits a `Set-Cookie: newsletter=\u003cid\u003e-\u003craw_token\u003e` 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\u0027s permanent raw authentication cookie, which they can then use to export the subscriber\u0027s full PII record via the JSON profile-export endpoint (`?na=px`), rewrite the subscriber\u0027s 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\u0027s relink key rotates, meaning that any party who observes such a URL \u2014 through a forwarded email, a shared inbox, a mail-gateway log, or Referer headers on the redirect target, which has no Referrer-Policy set \u2014 can replay it indefinitely to obtain the victim\u0027s credential.",
  "id": "GHSA-r57r-xx5c-pcg3",
  "modified": "2026-10-01T03:31:14Z",
  "published": "2026-10-01T03:31:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-92537"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module-base.php#L1209"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module-base.php#L441"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module.php#L403"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/statistics/statistics.php#L107"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/statistics/statistics.php#L174"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/statistics/statistics.php#L335"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3709894%40newsletter%2Ftags%2F9.4.0\u0026old=3695457%40newsletter%2Ftags%2F9.3.9"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/ed68a4ff-a2aa-4df7-96b1-f094bce4b9b7?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-92537 (GCVE-0-2026-92537)

Vulnerability from cvelistv5 – Published: 2026-10-01 02:27 – Updated: 2026-10-01 14:21

Title

Newsletter <= 9.3.9 - Unauthenticated Insufficiently Protected Credentials via '/tnp/l/' Click-Tracking REST Endpoint (Raw Subscriber Token Cookie Disclosure)

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.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-01 14:21 UTC

CWE

CWE-522 - Insufficiently Protected Credentials

Assigner

Wordfence mitre root Scorecard

References

8 references

URL	Tags
https://www.wordfence.com/threat-intel/vulnerabil…
https://plugins.trac.wordpress.org/browser/newsle…
https://plugins.trac.wordpress.org/browser/newsle…
https://plugins.trac.wordpress.org/browser/newsle…
https://plugins.trac.wordpress.org/browser/newsle…
https://plugins.trac.wordpress.org/browser/newsle…
https://plugins.trac.wordpress.org/browser/newsle…
https://plugins.trac.wordpress.org/changeset?repo…

Impacted products

1 product

Vendor	Product	Version
satollo	Newsletter – Send awesome emails from WordPress	Affected: 0 , ≤ 9.3.9 (semver)

Credits

Swayam

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-92537",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-01T14:21:07.819888Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-01T14:21:14.764Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Newsletter \u2013 Send awesome emails from WordPress",
          "vendor": "satollo",
          "versions": [
            {
              "lessThanOrEqual": "9.3.9",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Swayam"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Newsletter \u2013 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\u0027s public click-tracking REST route `/tnp/l/` is registered with `permission_callback =\u003e \u0027__return_true\u0027` and, upon receiving a valid keyed-MD5 signature, calls `set_user_cookie()`, which emits a `Set-Cookie: newsletter=\u003cid\u003e-\u003craw_token\u003e` 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\u0027s permanent raw authentication cookie, which they can then use to export the subscriber\u0027s full PII record via the JSON profile-export endpoint (`?na=px`), rewrite the subscriber\u0027s 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\u0027s relink key rotates, meaning that any party who observes such a URL \u2014 through a forwarded email, a shared inbox, a mail-gateway log, or Referer headers on the redirect target, which has no Referrer-Policy set \u2014 can replay it indefinitely to obtain the victim\u0027s credential."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-522",
              "description": "CWE-522 Insufficiently Protected Credentials",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-01T02:27:46.143Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
      "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=\u0026new=3709894%40newsletter%2Ftags%2F9.4.0\u0026old=3695457%40newsletter%2Ftags%2F9.3.9"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-09-16T13:37:46.000Z",
          "value": "Vendor Notified"
        },
        {
          "lang": "en",
          "time": "2026-09-30T13:32:34.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "Newsletter \u003c= 9.3.9 - Unauthenticated Insufficiently Protected Credentials via \u0027/tnp/l/\u0027 Click-Tracking REST Endpoint (Raw Subscriber Token Cookie Disclosure)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
    "assignerShortName": "Wordfence",
    "cveId": "CVE-2026-92537",
    "datePublished": "2026-10-01T02:27:46.143Z",
    "dateReserved": "2026-09-16T12:53:23.351Z",
    "dateUpdated": "2026-10-01T14:21:14.764Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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GHSA-R57R-XX5C-PCG3

CVE-2026-92537 (GCVE-0-2026-92537)

Tags

Sightings

Nomenclature

Related by attack behaviour