CVE-2026-92553 (GCVE-0-2026-92553)

Vulnerability from cvelistv5 – Published: 2026-10-16 06:41 – Updated: 2026-10-16 15:09
VLAI
Title
YaySMTP <= 2.7.7 - Authenticated (Subscriber+) Arbitrary File Upload via Attachment Filename Extension
Summary
The YaySMTP – WP Mail SMTP with Email Logs, Tracking & Reports plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.7.7 via the putFile function. This is due to insufficient file type validation in the putFile function, as sanitize_file_name() does not strip executable extensions and no allow-list, MIME check, or safe-extension rename is applied. This makes it possible for authenticated attackers, with subscriber-level access and above, to upload files that may be executable, which makes remote code execution possible. The only server-side guard is a .htaccess file containing 'Require all denied' written by writeGuards(), which is silently ignored by nginx and by Apache configured with AllowOverride None, meaning RCE is fully achievable on those server configurations.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 14:54 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
Wordfence CNA under the mitre root
CNA scorecard C 65/100 over 2309 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
yaycommerce YaySMTP – WP Mail SMTP with Email Logs, Tracking & Reports Affected: 0 , ≤ 2.7.7 (semver)
guessed Create a notification for this product.
Credits
Wordfence PRISM
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-92553",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T14:54:52.200646Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-16T15:09:38.412Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "YaySMTP \u2013 WP Mail SMTP with Email Logs, Tracking \u0026 Reports",
          "vendor": "yaycommerce",
          "versions": [
            {
              "lessThanOrEqual": "2.7.7",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Wordfence PRISM"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The YaySMTP \u2013 WP Mail SMTP with Email Logs, Tracking \u0026 Reports plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.7.7 via the putFile function. This is due to insufficient file type validation in the putFile function, as sanitize_file_name() does not strip executable extensions and no allow-list, MIME check, or safe-extension rename is applied. This makes it possible for authenticated attackers, with subscriber-level access and above, to upload files that may be executable, which makes remote code execution possible. The only server-side guard is a .htaccess file containing \u0027Require all denied\u0027 written by writeGuards(), which is silently ignored by nginx and by Apache configured with AllowOverride None, meaning RCE is fully achievable on those server configurations."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-434",
              "description": "CWE-434 Unrestricted Upload of File with Dangerous Type",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-16T06:41:03.415Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
      "references": [
        {
          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/4abbf148-4648-440c-8a82-cf68bf051fbe?source=cve"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/EmailLogAttachments.php#L542"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/EmailLogAttachments.php#L549"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/EmailLogAttachments.php#L178"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/EmailLogAttachments.php#L106"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/Utils.php#L814"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/PluginCore.php#L37"
        },
        {
          "url": "https://plugins.trac.wordpress.org/changeset/3739875/yaysmtp/trunk/includes/Helper/EmailLogAttachments.php"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-09-16T13:38:13.000Z",
          "value": "Vendor Notified"
        },
        {
          "lang": "en",
          "time": "2026-10-15T17:49:54.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "YaySMTP \u003c= 2.7.7 - Authenticated (Subscriber+) Arbitrary File Upload via Attachment Filename Extension"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
    "assignerShortName": "Wordfence",
    "cveId": "CVE-2026-92553",
    "datePublished": "2026-10-16T06:41:03.415Z",
    "dateReserved": "2026-09-16T13:11:57.702Z",
    "dateUpdated": "2026-10-16T15:09:38.412Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-92553",
      "date": "2026-10-16",
      "epss": "0.00575",
      "percentile": "0.46275"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "YaySMTP \u2013 WP Mail SMTP with Email Logs, Tracking \u0026 Reports",
                "vendor": "yaycommerce",
                "versions": [
                  {
                    "lessThanOrEqual": "2.7.7",
                    "status": "affected",
                    "version": "0",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "source": "security@wordfence.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "The YaySMTP \u2013 WP Mail SMTP with Email Logs, Tracking \u0026 Reports plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.7.7 via the putFile function. This is due to insufficient file type validation in the putFile function, as sanitize_file_name() does not strip executable extensions and no allow-list, MIME check, or safe-extension rename is applied. This makes it possible for authenticated attackers, with subscriber-level access and above, to upload files that may be executable, which makes remote code execution possible. The only server-side guard is a .htaccess file containing \u0027Require all denied\u0027 written by writeGuards(), which is silently ignored by nginx and by Apache configured with AllowOverride None, meaning RCE is fully achievable on those server configurations."
          }
        ],
        "id": "CVE-2026-92553",
        "lastModified": "2026-10-16T15:17:35.653",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 5.9,
              "source": "security@wordfence.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-92553",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T14:54:52.200646Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-10-16T07:17:14.150",
        "references": [
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/EmailLogAttachments.php#L106"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/EmailLogAttachments.php#L178"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/EmailLogAttachments.php#L542"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/EmailLogAttachments.php#L549"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/Utils.php#L814"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/PluginCore.php#L37"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/changeset/3739875/yaysmtp/trunk/includes/Helper/EmailLogAttachments.php"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/4abbf148-4648-440c-8a82-cf68bf051fbe?source=cve"
          }
        ],
        "sourceIdentifier": "security@wordfence.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-434"
              }
            ],
            "source": "security@wordfence.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-92553",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T14:54:52.200646Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T14:59:46.675Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "YaySMTP \u2013 WP Mail SMTP with Email Logs, Tracking \u0026 Reports",
              "vendor": "yaycommerce",
              "versions": [
                {
                  "lessThanOrEqual": "2.7.7",
                  "status": "affected",
                  "version": "0",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "Wordfence PRISM"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "The YaySMTP \u2013 WP Mail SMTP with Email Logs, Tracking \u0026 Reports plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.7.7 via the putFile function. This is due to insufficient file type validation in the putFile function, as sanitize_file_name() does not strip executable extensions and no allow-list, MIME check, or safe-extension rename is applied. This makes it possible for authenticated attackers, with subscriber-level access and above, to upload files that may be executable, which makes remote code execution possible. The only server-side guard is a .htaccess file containing \u0027Require all denied\u0027 written by writeGuards(), which is silently ignored by nginx and by Apache configured with AllowOverride None, meaning RCE is fully achievable on those server configurations."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-434",
                  "description": "CWE-434 Unrestricted Upload of File with Dangerous Type",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-16T06:41:03.415Z",
            "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
            "shortName": "Wordfence"
          },
          "references": [
            {
              "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/4abbf148-4648-440c-8a82-cf68bf051fbe?source=cve"
            },
            {
              "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/EmailLogAttachments.php#L542"
            },
            {
              "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/EmailLogAttachments.php#L549"
            },
            {
              "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/EmailLogAttachments.php#L178"
            },
            {
              "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/EmailLogAttachments.php#L106"
            },
            {
              "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/Helper/Utils.php#L814"
            },
            {
              "url": "https://plugins.trac.wordpress.org/browser/yaysmtp/tags/2.7.7/includes/PluginCore.php#L37"
            },
            {
              "url": "https://plugins.trac.wordpress.org/changeset/3739875/yaysmtp/trunk/includes/Helper/EmailLogAttachments.php"
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2026-09-16T13:38:13.000Z",
              "value": "Vendor Notified"
            },
            {
              "lang": "en",
              "time": "2026-10-15T17:49:54.000Z",
              "value": "Disclosed"
            }
          ],
          "title": "YaySMTP \u003c= 2.7.7 - Authenticated (Subscriber+) Arbitrary File Upload via Attachment Filename Extension"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "assignerShortName": "Wordfence",
        "cveId": "CVE-2026-92553",
        "datePublished": "2026-10-16T06:41:03.415Z",
        "dateReserved": "2026-09-16T13:11:57.702Z",
        "dateUpdated": "2026-10-16T15:09:38.412Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.