Security readout for executives and security teams
Plain-English summary
Mautic has a stored cross-site scripting issue in description fields before the patched version. A logged-in user with suitable permissions could store malicious content that affects another user who views it, potentially increasing the attacker’s access within the application.
Executive priority
Treat as high priority where Mautic supports marketing, customer, or administrative workflows. The main business risk is authenticated users escalating access through content viewed by others.
Technical view
CVE-2021-27915 is a stored XSS flaw in Mautic description fields, classified as CWE-80. The CVSS 3.1 score is 7.6 with low attack complexity, low privileges required, user interaction required, and high confidentiality and integrity impact.
Likely exposure
Exposure is most relevant for organizations running vulnerable Mautic deployments where lower-privileged authenticated users can edit description fields viewed by higher-privileged users.
Exploitation context
The source bundle does not report known active exploitation, and KEV status is false. Exploitation requires authenticated access, appropriate permissions, and another user viewing affected content.
Researcher notes
Evidence identifies stored XSS in description fields and potential elevated access, but the bundle does not name the fixed version. Avoid assuming exploit availability or affected integrations beyond Mautic core-lib.
Mitigation direction
- Review the GitHub security advisory for the patched Mautic version.
- Upgrade affected Mautic deployments to the vendor-patched release.
- Restrict description-field editing to trusted roles until patched.
- Review existing description content for unexpected script-like entries.
Validation and detection
- Inventory all Mautic deployments and installed versions.
- Confirm whether each deployment predates the patched version.
- Review role permissions for users who can edit description fields.
- Check audit logs for suspicious description-field changes.
- Validate in staging that patched builds sanitize description rendering.
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-80: 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-2021-27915 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
- 7.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L
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:L/PR:L/UI:R/S:U/C:H/I:H/A:L2.15.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.6HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/mautic/mautic/security/advisories/GHSA-2rc5-2755-v422CVE reference
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 Script-Related HTML Tags in a Web Page (Basic XSS)
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.