Security readout for executives and security teams
Plain-English summary
This is a medium-severity cross-site scripting issue reported in Feehi CMS through 2.1.1. An attacker could place malicious browser-side script in the login page username field, affecting a user who views the resulting content. Business impact is mainly account/session risk, page tampering, and phishing inside the CMS context.
Executive priority
Prioritize as a moderate web application risk. It is not listed as known exploited in the provided sources, but public login exposure can raise practical risk. Address during the next remediation cycle, sooner for internet-facing CMS deployments.
Technical view
CVE-2021-36572 is CWE-79 XSS in the Feehi CMS login page username field. The CVSS 3.1 score is 6.1, with network access, low complexity, no privileges required, user interaction required, changed scope, low confidentiality impact, low integrity impact, and no availability impact.
Likely exposure
Exposure is likely limited to organizations running Feehi CMS versions through 2.1.1, especially where the login page is reachable from untrusted networks. The provided affected CPE data is incomplete.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The issue is publicly disclosed through a GitHub issue, so defenders should treat details as public but not assume exploitation without local evidence.
Researcher notes
The record names Feehi CMS through 2.1.1, but structured affected product and CPE fields are not populated. No source-provided patch version, commit, or mitigation is included in the bundle, so remediation should be tied to project guidance or local code review.
Mitigation direction
- Check Feehi CMS project guidance for a vendor-confirmed fixed release.
- Upgrade only to a version the project identifies as remediated.
- Limit login page exposure to trusted networks where operationally feasible.
- Apply standard XSS output-encoding controls in maintained forks or custom deployments.
- Monitor authentication pages and logs for suspicious username input patterns.
Validation and detection
- Inventory whether Feehi CMS is deployed and identify the running version.
- Confirm whether any deployment is version 2.1.1 or earlier.
- Review the linked project issue and CVE record for vendor-specific updates.
- Verify login page handling of username values in a non-production environment.
- Check whether public access to the CMS login page is required.
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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-36572 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/liufee/cms/issues/58CVE 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 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.