Security readout for executives and security teams
Plain-English summary
Contao CMS installations with untrusted backend users who can use the form generator may let those users gain privileged backend rights. This matters because compromise starts from an existing backend account but can expand to control over site data, configuration, and availability.
Executive priority
Treat as high priority for Contao sites with multiple backend users, contractors, customers, or shared editorial access. Single-admin sites have lower practical exposure but should still patch during the next maintenance window.
Technical view
CVE-2021-37627 is a CWE-269 privilege management flaw in Contao. Affected ranges are <4.4.56, 4.5.0 to <4.9.18, and 4.10.0 to <4.11.7. CVSS 3.1 is 8.0 with high complexity, high privileges required, changed scope, and high CIA impact.
Likely exposure
Exposure is limited to Contao deployments in affected versions where untrusted backend users have access to the form generator. Public visitors without backend access are not identified as the affected threat model in the provided sources.
Exploitation context
The bundle does not cite active exploitation, KEV listing, or public exploit details. Abuse requires existing backend access according to the advisory condition, with CVSS marking privileges required as high.
Researcher notes
The key condition is not broad internet reachability alone; it is affected Contao versions plus untrusted backend users with form generator access. Sources do not describe exploit mechanics, so validation should focus on version, role, and feature exposure.
Mitigation direction
- Update Contao to 4.4.56, 4.9.18, 4.11.7, or later supported releases.
- Temporarily disable the form generator if immediate upgrade is not possible.
- Disable login for untrusted backend users until patched.
- Review Contao vendor guidance before production rollout.
Validation and detection
- Inventory Contao versions across production, staging, and managed customer sites.
- Check whether untrusted backend users can access the form generator.
- Confirm upgraded systems report Contao 4.4.56, 4.9.18, 4.11.7, or later.
- Review backend user roles for unnecessary form generator permissions.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-269: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-37627 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H1.36Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8HighVector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/contao/contao/security/advisories/GHSA-hq5m-mqmx-fw6mCVE reference · x_refsource_CONFIRM
- https://contao.org/en/security-advisories/privilege-escalation-with-the-form-generator.htmlCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Privilege Management
Improper Privilege Management represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.