CVE-2020-12827Public exploitNetwork attack vector

File disclosure and service interruption via mj-include

Published Jun 17, 2020 · Updated Aug 4, 2024

Path traversal in MJML before 4.6.3 allows attackers to disclose local file data or interrupt an embedding service via mj-include. The mj-include path handler accepts absolute and traversal paths without confining them to the template root, then exposes read errors to the caller. Reachability requires an embedding application to process attacker-controlled MJML; returned errors reveal paths, file existence, or file fragments, while unbounded device reads can hang the service.

CVSS severity7.2
High
EPSS probability2.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in MJML before 4.6.3 allows attackers to disclose local file data or interrupt an embedding service via mj-include. The mj-include path handler accepts absolute and traversal paths without confining them to the template root, then exposes read errors to the caller. Reachability requires an embedding application to process attacker-controlled MJML; returned errors reveal paths, file existence, or file fragments, while unbounded device reads can hang the service.

The record

CVE
CVE-2020-12827
Published
Jun 17, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-22, T1083, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 17, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:P
7.2RCE SecurityCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1083File and Directory Discovery
T1005Data from Local System

Public exploit references

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Technologies

Your stack

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Your stack

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