Security readout for executives and security teams
Plain-English summary
Mautic's password reset page could run attacker-supplied JavaScript if a user is tricked into opening a crafted reset link containing the vulnerable bundle parameter. User interaction is required, but browser-session impact can still affect confidentiality, integrity, and availability at a limited level.
Executive priority
Prioritize remediation during the next standard security update cycle, faster if Mautic handles sensitive contacts, marketing data, or privileged users. The risk is not presented as actively exploited, but public-facing reset workflows create phishing-driven exposure.
Technical view
CVE-2021-27909 is a CWE-79 XSS flaw in Mautic before 3.3.4 and 4.0.0. The vulnerable URL parameter is bundle on the password reset page. CVSS 3.1 is 6.3 with network attack vector, low complexity, no privileges required, and required user interaction.
Likely exposure
Exposure is limited to organizations running Mautic versions earlier than 3.3.4 or 4.0.0, especially where password reset flows are internet-accessible. The source bundle does not identify affected CPEs or exact vulnerable build ranges beyond those version thresholds.
Exploitation context
The attacker must persuade a target to click a malicious password reset URL. The provided sources do not state active exploitation, and this CVE is not listed as KEV in the bundle.
Researcher notes
The evidence identifies the vulnerable parameter and affected pre-fix versions, but does not provide deeper root-cause detail, exploit prevalence, or complete version enumeration. Avoid assuming exploitation beyond user-assisted XSS through the password reset URL.
Mitigation direction
- Upgrade Mautic 3.x deployments to 3.3.4 where applicable.
- Upgrade Mautic 4.x deployments to 4.0.0 where applicable.
- For older branches, check Mautic vendor guidance before choosing a remediation path.
- Treat suspicious password reset links as phishing risk during remediation.
Validation and detection
- Inventory all Mautic instances and record their installed versions.
- Confirm no production instance runs a version before 3.3.4 or 4.0.0.
- Review password reset pages for exposure on public-facing systems.
- Check security monitoring for suspicious password reset URL activity.
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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-27909 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
- Medium
- CVSS
- 6.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/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:N/UI:R/S:U/C:L/I:L/A:L2.83.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/mautic/mautic/security/advisories/GHSA-32hw-3pvh-vcvcCVE 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.