HOME VULNERABILITIESCVE-2021-37626

HIGH

CVE-2021-37626

CWE-94Published: August 11, 2021· Updated: Jun 17, 2026

7.2

CVSS v3.1

Official Description

Contao is an open source CMS that allows you to create websites and scalable web applications. In affected versions it is possible to load PHP files by entering insert tags in the Contao back end. Installations are only affected if they have untrusted back end users who have the rights to modify fields that are shown in the front end. Update to Contao 4.4.56, 4.9.18 or 4.11.7 to resolve. If you cannot update then disable the login for untrusted back end users.

Technical Analysis

CVE-2021-37626 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.2.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.High

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

contao1 product(s)

contao

Source: NVD CPE · 10 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://contao.org/en/security-advisories/php-file-inclusion-via-insert-tags.html

ADVISORYhttps://github.com/contao/contao/security/advisories/GHSA-r6mv-ppjc-4hgr

ADVISORYhttps://contao.org/en/security-advisories/php-file-inclusion-via-insert-tags.html

ADVISORYhttps://github.com/contao/contao/security/advisories/GHSA-r6mv-ppjc-4hgr

All References (4)

→

https://contao.org/en/security-advisories/php-file-inclusion-via-insert-tags.htmlVendor Advisory

→

https://github.com/contao/contao/security/advisories/GHSA-r6mv-ppjc-4hgrThird Party Advisory

→

https://contao.org/en/security-advisories/php-file-inclusion-via-insert-tags.htmlVendor Advisory

→

https://github.com/contao/contao/security/advisories/GHSA-r6mv-ppjc-4hgrThird Party Advisory

Quick Facts

CVE IDCVE-2021-37626

CVSS Score7.2 / 10

SeverityHIGH

WeaknessCWE-94

CISA KEVNo

Affected1 vendor(s)

PublishedAug 11, 2021

Related CVEs (CWE-94)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2021-37626 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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