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NVD / CVE Program· CNA GitHub_M

CVE-2021-37626: PHP file inclusion via insert tags

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.2% (FIRST EPSS); higher than 69.6% of all records.
  • Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: contao/contao (Packagist) 4.4.56, 4.11.7, 4.9.18; contao/core-bundle (Packagist) 4.4.56, 4.11.7, 4.9.18.

Low priority for now. Upgrade to contao/contao (Packagist) 4.4.56, 4.11.7, 4.9.18; contao/core-bundle (Packagist) 4.4.56, 4.11.7, 4.9.18 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.2 · v3.1—No exploit Fix available
Published
Aug 11, 2021
Updated
Jun 17, 2026
EPSS
1.2% · 69th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.2%

CNA vs NVD score

NVD
7.2
CNA · GitHub_M
7.2
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-37626

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
contaocontao

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • contao contao4.4.0 and later · before 4.4.56
  • contao contao4.9.0 and later · before 4.9.18
  • contao contao4.11.0 and later · before 4.11.7
  • contao contao4.0.0
  • contao contao4.1.0
  • contao contao4.10.0
  • contao contao4.2.0
  • contao contao4.3.0
  • contao contao4.5.0
  • contao contao4.6.0
  • contao contao4.7.0
  • contao contao4.8.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • contao contao

    • >= 4.0.0, < 4.4.56, >= 4.5.0, < 4.9.18, >= 4.10.0, < 4.11.7affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Packagistcontao/contaofrom 4.0.0 · before 4.4.564.4.56
Packagistcontao/contaofrom 4.10.0 · before 4.11.74.11.7
Packagistcontao/contaofrom 4.5.0 · before 4.9.184.9.18
Packagistcontao/core-bundlefrom 4.0.0 · before 4.4.564.4.56
Packagistcontao/core-bundlefrom 4.10.0 · before 4.11.74.11.7
Packagistcontao/core-bundlefrom 4.5.0 · before 4.9.184.9.18

Same product

contao: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-26265Contao Managed Edition v1.5.0 was discovered to contain a remote command execution (RCE) vulnerability via the component php_cli parameter.
    48Plan
  • CVE-2019-11512Contao 4.x allows SQL Injection.
    39Monitor
  • CVE-2026-107845Contao: Cross-site scripting in the comments bundle
    37Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2020-25768Oct 7, 2020 · Contao before 4.4.52, 4.9.x before 4.9.6, and 4.10.x before 4.10.1 have Improper Input Validation.
    21Monitor
  • ← EarlierCVE-2021-35210Jun 23, 2021 · Contao 4.5.x through 4.9.x before 4.9.16, and 4.10.x through 4.11.x before 4.11.5, allows XSS.
    24Monitor
  • Later →CVE-2021-37627Aug 11, 2021 · Privilege escalation via form generator
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Packagist:contao/contao4.11.7Package registry (OSV)
Packagist:contao/contao4.4.56Package registry (OSV)
Packagist:contao/contao4.9.18Package registry (OSV)
Packagist:contao/core-bundle4.11.7Package registry (OSV)
Packagist:contao/core-bundle4.4.56Package registry (OSV)
Packagist:contao/core-bundle4.9.18Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-94 · Improper Control of Generation of Code ('Code Injection')

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records