CVE-2016-10033 (GCVE-0-2016-10033)

Vulnerability from cvelistv5 – Published: 2016-12-30 19:00 – Updated: 2025-10-21 23:55
VLAI? CISA KEV
Summary
The mailSend function in the isMail transport in PHPMailer before 5.2.18 might allow remote attackers to pass extra parameters to the mail command and consequently execute arbitrary code via a \" (backslash double quote) in a crafted Sender property.
Severity ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • n/a
Assigner
References
http://packetstormsecurity.com/files/140350/PHPMa… x_refsource_MISC
https://www.drupal.org/psa-2016-004 x_refsource_CONFIRM
https://www.exploit-db.com/exploits/42221/ exploitx_refsource_EXPLOIT-DB
https://www.exploit-db.com/exploits/40969/ exploitx_refsource_EXPLOIT-DB
https://www.exploit-db.com/exploits/41962/ exploitx_refsource_EXPLOIT-DB
https://www.exploit-db.com/exploits/40968/ exploitx_refsource_EXPLOIT-DB
https://legalhackers.com/advisories/PHPMailer-Exp… x_refsource_MISC
https://github.com/PHPMailer/PHPMailer/releases/t… x_refsource_CONFIRM
http://www.securityfocus.com/archive/1/539963/100… mailing-listx_refsource_BUGTRAQ
https://github.com/PHPMailer/PHPMailer/wiki/About… x_refsource_CONFIRM
http://packetstormsecurity.com/files/140291/PHPMa… x_refsource_MISC
https://www.exploit-db.com/exploits/40974/ exploitx_refsource_EXPLOIT-DB
https://www.exploit-db.com/exploits/40986/ exploitx_refsource_EXPLOIT-DB
https://www.exploit-db.com/exploits/40970/ exploitx_refsource_EXPLOIT-DB
http://www.rapid7.com/db/modules/exploit/multi/ht… x_refsource_MISC
https://www.exploit-db.com/exploits/41996/ exploitx_refsource_EXPLOIT-DB
http://seclists.org/fulldisclosure/2016/Dec/78 mailing-listx_refsource_FULLDISC
http://www.securityfocus.com/bid/95108 vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1037533 vdb-entryx_refsource_SECTRACK
https://developer.joomla.org/security-centre/668-… x_refsource_CONFIRM
https://www.exploit-db.com/exploits/42024/ exploitx_refsource_EXPLOIT-DB
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: e3518128-3fbc-4333-ba02-a26c1521c33f

Vulnerability ID: CVE-2016-10033

Status: Confirmed

Status Updated: 2025-07-07 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-07-07
Asserted: 2025-07-07
Scope
Notes: KEV entry: PHPMailer Command Injection Vulnerability | Affected: PHP / PHPMailer | Description: PHPMailer contains a command injection vulnerability because it fails to sanitize user-supplied input. Specifically, this issue affects the 'mail()' function of 'class.phpmailer.php' script. An attacker can exploit this issue to execute arbitrary code within the context of the application. Failed exploit attempts will result in a denial-of-service condition. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2025-07-28 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/PHPMailer/PHPMailer/releases/tag/v5.2.18 ; https://github.com/advisories/GHSA-5f37-gxvh-23v6 ; https://nvd.nist.gov/vuln/detail/CVE-2016-10033
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-77 CWE-88
Feed CISA Known Exploited Vulnerabilities Catalog
Product PHPMailer
Due Date 2025-07-28
Date Added 2025-07-07
Vendorproject PHP
Vulnerabilityname PHPMailer Command Injection Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:25 UTC | Updated: 2026-02-02 12:25 UTC
Show details on NVD website
To clipboard 

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  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2016-10033",
    "datePublished": "2016-12-30T19:00:00.000Z",
    "dateReserved": "2016-12-22T00:00:00.000Z",
    "dateUpdated": "2025-10-21T23:55:47.202Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "cisa_known_exploited": {
      "cveID": "CVE-2016-10033",
      "cwes": "[\"CWE-77\", \"CWE-88\"]",
      "dateAdded": "2025-07-07",
      "dueDate": "2025-07-28",
      "knownRansomwareCampaignUse": "Unknown",
      "notes": "This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/PHPMailer/PHPMailer/releases/tag/v5.2.18 ; https://github.com/advisories/GHSA-5f37-gxvh-23v6 ; https://nvd.nist.gov/vuln/detail/CVE-2016-10033",
      "product": "PHPMailer",
      "requiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
      "shortDescription": "PHPMailer contains a command injection vulnerability because it fails to sanitize user-supplied input. Specifically, this issue affects the \u0027mail()\u0027 function of \u0027class.phpmailer.php\u0027 script. An attacker can exploit this issue to execute arbitrary code within the context of the application. Failed exploit attempts will result in a denial-of-service condition.",
      "vendorProject": "PHP",
      "vulnerabilityName": "PHPMailer Command Injection Vulnerability"
    },
    "fkie_nvd": {
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      "id": "CVE-2016-10033",
      "lastModified": "2024-11-21T02:43:07.560",
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      "published": "2016-12-30T19:59:00.137",
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  }
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.