The version of Symfony and/or its Symfony Monolog Bridge / MIME / Mailer / Routing / Security HTTP Components installed on the remote host is/are prior to 6.1.x prior to 6.4.40, 7.0.x prior to 7.4.12, 8.0.x prior to 8.0.12, and, therefore, affected by multiple vulnerabilities:

  - An authentication bypass vulnerability exists in Symfony Component's X509Authenticator client-certificate     (mTLS) authentication due to use of an unanchored regex to extract the emailAddress from the Subject DN     string. An unauthenticated, remote attacker can exploit this, via a crafted client certificate containing     an emailAddress string embedded within the CN (Common Name) field, to bypass authentication and impersonate     arbitrary users. (CVE-2026-45063)

  - An unsafe deserialization vulnerability exists in Symfony Monolog Bridge Component's ServerLogCommand     (server:log console command) due to binding to all network interfaces (0.0.0.0:9911) by default and     performing unauthenticated PHP object deserialization without an allowed_classes, allowlist, or integrity     checks. An unauthenticated, remote attacker can exploit this, via crafted serialized PHP payloads sent to     TCP port 9911, to cause a denial of service or potentially achieve remote code execution through PHP object     injection with magic-method side effects, depending on available gadget chains in the target environment.
    (CVE-2026-45077)

  - A CRLF injection vulnerability exists in Symfony MIME Component's Address class due to the constructor     accepting email addresses with quoted local-parts containing raw \r\n bytes, despite being documented as     validating input. An authenticated, remote attacker can exploit this, via crafted email addresses with     embedded CRLF sequences in the local-part (e.g., 'x\r\nBcc: attacker@evil'@example.com), to inject arbitrary     email headers and SMTP commands, enabling unauthorized email disclosure, spam relay, or other mail-system     abuse. (CVE-2026-45067)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number. Also note that this plugin does not distinguish between PHP packages installed via the OS package manager, PHP packages installed via Composer, or other sources. As a result, packages provided by your OS package repository may have backported fixes that this plugin may incorrectly report as vulnerable. Please refer to the OS-specific plugins for CVE-2026-45063, CVE-2026-45065, CVE-2026-45067, CVE-2026-45068, and CVE-2026-45077 to check for backported fixes.

Detections

Analytics

Symfony and Multiple Symfony Components < 5.4.52 / 6.x < 6.4.40 / 7.x < 7.4.12 / 8.x < 8.0.12 Multiple Vulnerabilities

critical Nessus Plugin ID 318791

Version 1.3

Version 1.2

Version 1.1

Version 1.3 Aug 26, 2026, 1:14 PM CVSS metrics ("CVSSv2 score" set to 9.4) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N") CVSS metrics ("CVSSv3 score" set to 9.1) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N") CVSS metrics ("Cvssv4 score" set to 9.1) CVSS metrics ("Cvssv4 vector" set to "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N") Plugin Feed: 202608261314
Version 1.2 Jun 8, 2026, 10:45 AM CVSS metrics ("Cvssv4 threat vector" set to "CVSS:4.0/E:U") CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:U/RL:OF/RC:C") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:U/RL:O/RC:C") Exploit attributes ("Exploit available" set to "False") Exploit attributes ("Exploitability ease" set to "No known exploits are available") Plugin Feed: 202606081045
Version 1.1 Jun 5, 2026, 7:13 PM New Plugin Feed: 202606051913