CVE-2026-45755

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Source
https://cve.org/CVERecord?id=CVE-2026-45755
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45755.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-45755
Aliases
Downstream
Published
2026-07-14T18:56:20.615Z
Modified
2026-07-17T03:46:45.279587937Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Symfony: Mailtrap Mailer Webhook Parser Never Verifies the X-Mt-Signature HMAC — Unauthenticated Webhook Event Injection
Details

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.12 and 8.0.12, MailtrapRequestParser::doParse() received the configured webhook secret but ignored the X-Mt-Signature HMAC header, allowing unauthenticated POST requests to inject forged Mailtrap delivery, bounce, open, click, or spam events. This issue is fixed in versions 7.4.12 and 8.0.12.

Database specific 
{
    "cwe_ids": [
        "CWE-306",
        "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45755.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/symfony/security-http

Affected ranges

Type
GIT
Repo
https://github.com/symfony/security-http
Events
Introduced
0d0ab4d491f22306c893b2d30ce73ea911201a61
Fixed
1fc7ca636cbd2cad29b42cc13c9fd0c681c6efee
Introduced
bea6dc79db4d95c34b77ec27273d812aa64d65be
Fixed
d776945b2dc41c0e609c56c1ef69863ab56856ed
Database specific 
{
    "cpe": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "7.2.0"
        },
        {
            "fixed": "7.4.12"
        },
        {
            "introduced": "8.0.0"
        },
        {
            "fixed": "8.0.12"
        }
    ],
    "source": "CPE_RANGE"
}
Type
GIT
Repo
https://github.com/symfony/symfony
Events
Introduced
df8cd437bf489cf5aebe7e01e61daad120321c3b
Fixed
275f5cbccbcc50205206f05e599c4f57009aadb8
Introduced
2e913a829cfbbf9cb38b321bdff1806b44b192eb
Fixed
06d3b2c9a8aeb5d8493738cc51e24f6a1215827c
Fixed
4e0467e4e182cf2e704a3d9e1bc1a6be65d52ab8
Database specific 
{
    "cpe": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "7.2.0"
        },
        {
            "fixed": "7.4.12"
        },
        {
            "introduced": "8.0.0"
        },
        {
            "fixed": "8.0.12"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

v7.*
v7.2.0
v7.2.0-RC1
v7.2.1
v7.3.0
v7.3.0-BETA1
v7.3.0-BETA2
v7.3.0-RC1
v7.4.0
v7.4.0-BETA1
v7.4.0-RC1
v7.4.0-RC2
v7.4.1
v7.4.11
v7.4.3
v7.4.4
v7.4.6
v7.4.8
v7.4.9
v8.*
v8.0.0
v8.0.1
v8.0.10
v8.0.11
v8.0.2
v8.0.3
v8.0.4
v8.0.5
v8.0.6
v8.0.7
v8.0.8
v8.0.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45755.json"