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 <script> would be rendered as `` 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.
CVE-2024-26151
This high-severity CVE scores 8.2 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 54% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- High severity, but no confirmed exploitation yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.2
- EG Score
- 8.2(medium)
- EG Risk
- 53(Track)EG Risk 53/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity82% × 45%Exploitation40% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS
- 46.1%
- KEV
- Not listed
Published
February 22, 2024
Last Modified
February 5, 2025
References (11)
- security-advisories@githubhttps://github.com/FelixSchwarz/mjml-python/commit/84c495da20a91640a1ca551ace17df7f3be644aa
- security-advisories@githubhttps://github.com/FelixSchwarz/mjml-python/commit/8d410b7a500703080bb14ed7e3d2663fe16767e6
- security-advisories@githubhttps://github.com/FelixSchwarz/mjml-python/issues/52
- security-advisories@githubhttps://github.com/FelixSchwarz/mjml-python/releases/tag/v0.11.0
- security-advisories@githubhttps://github.com/FelixSchwarz/mjml-python/security/advisories/GHSA-578p-fxmm-6229
- af854a3a-2127-422b-91ae-364da2661108https://github.com/FelixSchwarz/mjml-python/commit/84c495da20a91640a1ca551ace17df7f3be644aa
- af854a3a-2127-422b-91ae-364da2661108https://github.com/FelixSchwarz/mjml-python/commit/8d410b7a500703080bb14ed7e3d2663fe16767e6
- af854a3a-2127-422b-91ae-364da2661108https://github.com/FelixSchwarz/mjml-python/issues/52
- af854a3a-2127-422b-91ae-364da2661108https://github.com/FelixSchwarz/mjml-python/releases/tag/v0.11.0
- af854a3a-2127-422b-91ae-364da2661108https://github.com/FelixSchwarz/mjml-python/security/advisories/GHSA-578p-fxmm-6229
- af854a3a-2127-422b-91ae-364da2661108https://www.vicarius.io/vsociety/posts/cve-2024-26151-mjml-python-vulnerability-1
Affected Packages
(1 across 1 ecosystem)
PyPI(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| mjml | 0.10.0 | 0.11.0 | — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 13× in last 7d / 48× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
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Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2024-26151?
When was CVE-2024-26151 disclosed?
Is CVE-2024-26151 actively exploited?
What is the CVSS score of CVE-2024-26151?
How do I remediate CVE-2024-26151?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2024-26151
Is Your Infrastructure Affected by CVE-2024-26151?
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