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Vulnerability · Published Feb 22, 2024 · Assigned by GitHub_M

CVE-2024-26151Potentially untrusted input is rendered as HTML in final output

High 8.2

In plain English

A high-severity improper input validation in mjml-python from FelixSchwarz. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.2High
Exploit odds (30 days)0.6%top 50.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

The `mjml` PyPI package, found at the `FelixSchwarz/mjml-python` GitHub repo, is an unofficial Python port of MJML, a markup language created by Mailjet. All users of `FelixSchwarz/mjml-python` who insert untrusted data into mjml templates unless that data is checked in a very strict manner. User input like `&lt;script&gt;` would be rendered as `<script>` in the final HTML output. The attacker must be able to control some data which is later injected in an mjml template which is then send out as email to other users. The attacker could control contents of email messages sent through the platform. The problem has been fixed in version 0.11.0 of this library. Versions before 0.10.0 are not affected by this security issue. As a workaround, ensure that potentially untrusted user input does not contain any sequences which could be rendered as HTML.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPImjml0.11.0GHSA-578p-fxmm-6229
PyPImjml0.11.0PYSEC-2026-1631

Affected products (as reported)

VendorProductVersions
FelixSchwarz mjml-python = 0.10.0

Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:L

References