Security readout for executives and security teams
Plain-English summary
Mautic allowed a stored cross-site scripting issue in contact first or last names. A malicious contact record could affect a staff user when they viewed contact details and interacted with the actions menu. The risk is high because contacts can originate from forms, APIs, integrations, or manual entry.
Executive priority
Prioritize remediation for internet-facing or integration-heavy Mautic deployments. This is not listed as known exploited in the provided sources, but the business impact can be material because staff sessions and sensitive marketing data may be exposed.
Technical view
CVE-2021-27911 is a CWE-79 XSS in Mautic before 3.3.4/4.0.0. The source describes inline JavaScript execution via contact first or last name, triggered in the contact details page action dropdown when hovering over Campaigns. CVSS 3.1 is 8.3 with network attack vector, high complexity, required user interaction, and changed scope.
Likely exposure
Exposure is likely where Mautic versions older than 3.3.4 or 4.0.0 process contact data from untrusted or semi-trusted sources such as public forms, APIs, third-party syncing, or manual imports.
Exploitation context
The bundle does not show CISA KEV listing or confirmed active exploitation. Exploitation requires a user to view the affected contact details page and interact with the relevant menu, but contact data may enter from multiple sources.
Researcher notes
The source bundle gives a precise UI trigger and data fields but limited patch detail beyond fixed version boundaries. Do not assume other Mautic fields or products are affected without vendor evidence.
Mitigation direction
- Upgrade Mautic to 3.3.4, 4.0.0, or a later supported release.
- Review the GitHub security advisory for vendor-specific remediation details.
- Restrict untrusted contact creation or synchronization paths until patched.
- Audit and clean suspicious contact first and last name values.
- Limit Mautic administrative access to trusted users.
Validation and detection
- Inventory all Mautic deployments and confirm exact installed versions.
- Verify no deployment remains below 3.3.4 or the 4.0.0 fixed boundary.
- Review enabled contact intake paths: UI, API, forms, and third-party syncs.
- Inspect recent contact records for unexpected script-like content in names.
- Confirm patched staging behavior using safe, non-weaponized test data.
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-2021-27911 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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:N/UI:R/S:C/C:H/I:H/A:H1.66Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.3HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/mautic/mautic/security/advisories/GHSA-72hm-fx78-xwhcCVE 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.