Security readout for executives and security teams
Plain-English summary
CVE-2021-27912 is a Mautic cross-site scripting issue. A logged-in user who can create or edit assets may cause JavaScript to run when an asset is viewed. That can put sensitive data, user actions, and trust in the marketing platform at risk.
Executive priority
Treat this as high priority for Mautic environments with multiple content editors or delegated marketing access. It is not described as remotely exploitable without authentication, but successful abuse could affect confidentiality, integrity, and availability.
Technical view
Mautic versions before 3.3.4 and 4.0.0 are vulnerable to CWE-79 XSS on asset view. The CVE describes inline JavaScript in an asset title combined with a remote asset condition. Exploitation requires authentication, asset create/edit permission, and user interaction.
Likely exposure
Exposure is most relevant where Mautic is used and non-administrator users can create or edit assets. Publicly reachable Mautic does not alone prove exposure because authenticated permissions are required.
Exploitation context
The supplied sources do not show active exploitation, and this CVE is not marked KEV. Practical abuse depends on valid credentials, asset permissions, and a victim viewing the affected asset.
Researcher notes
Evidence is limited to the CVE record and Mautic advisory reference. No CPEs are supplied, and affected version detail is expressed as before 3.3.4/4.0.0. Do not assume broader products or active exploitation from this bundle.
Mitigation direction
- Upgrade Mautic to 3.3.4, 4.0.0, or later supported versions.
- Review vendor advisory guidance before applying operational workarounds.
- Restrict asset create and edit permissions to trusted users only.
- Audit existing assets for suspicious titles or remote asset entries.
- Prioritize review of accounts with broad marketing or admin permissions.
Validation and detection
- Inventory all Mautic deployments and confirm exact versions.
- Identify users and roles with asset create or edit rights.
- Confirm vulnerable versions are upgraded or scheduled for upgrade.
- Review asset records for suspicious title content or remote asset references.
- Use regression testing to confirm asset views encode unsafe script content.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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 lookupCVE-2021-27912 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
- 7.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/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:L/UI:R/S:U/C:H/I:H/A:H1.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.1HighVector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/mautic/mautic/security/advisories/GHSA-rh5w-82wh-jhr8CVE 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 Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.