Security readout for executives and security teams
Plain-English summary
This issue affects the Knock Knock plugin for Craft CMS before 1.2.8. A visitor could spoof the X-Forwarded-For header and bypass an IP whitelist. Business risk depends on whether the plugin protects private or pre-release site content.
Executive priority
Prioritize if Knock Knock protects confidential content, staging environments, or administrative workflows. Otherwise handle through normal dependency remediation, because active exploitation is not shown in the supplied sources.
Technical view
CVE-2020-13485 is an IP whitelist bypass in Knock Knock before 1.2.8 for Craft CMS. The reported bypass uses the X-Forwarded-For HTTP header. Sources do not provide CVSS, CWE, exploit maturity, or detailed affected deployment conditions.
Likely exposure
Exposure is likely limited to Craft CMS sites using Knock Knock before 1.2.8 with IP whitelisting enabled or relied upon for access restriction.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. The bug is conceptually easy to understand, but provided sources do not include exploit steps or exploitation prevalence.
Researcher notes
The available record is sparse: no CVSS, CWE, CPEs, or detailed exploit conditions are included. Validate against the plugin changelog, Limpid Security advisory, and local proxy topology before rating site-specific impact.
Mitigation direction
- Inventory Craft CMS sites for the Knock Knock plugin.
- Upgrade Knock Knock from versions before 1.2.8.
- Review vendor changelog and advisory for supported remediation guidance.
- Avoid relying on client-supplied forwarding headers for access decisions.
- Add stronger authentication for restricted content where practical.
Validation and detection
- Confirm installed Knock Knock plugin versions across Craft CMS deployments.
- Verify whether IP whitelist functionality is enabled and security-relevant.
- Review reverse proxy handling of X-Forwarded-For headers.
- Check access logs for suspicious forwarded-header patterns.
- Retest whitelist behavior after updating or reconfiguring.
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.
CVE-2020-13485 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/verbb/knock-knock/blob/craft-3/CHANGELOG.mdCVE reference · x_refsource_MISC
- https://limpidsecurity.pl/security-advisories/1/knock-knock-plugin-for-craft-cms/CVE 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.