Security readout for executives and security teams
Plain-English summary
CVE-2020-36955 is a stored cross-site scripting issue in Grav CMS 1.6.30 with Admin Plugin 1.9.18. An authenticated user can place script content in a page title that later runs for viewers in the admin panel or site. This is mainly a risk where untrusted or lower-privileged users can create or edit pages.
Executive priority
Treat as a medium-priority remediation item. Prioritize sites with multiple editors, contractors, or externally exposed admin workflows. The main business risk is session theft, malicious content execution, or admin-user compromise after a trusted user views a crafted page title.
Technical view
The issue is CWE-79 stored XSS in the page title field. The provided CVSS v3.1 score is 6.4, with network access, low complexity, low privileges required, changed scope, and low confidentiality/integrity impact. Sources identify Grav CMS 1.6.30 and Admin Plugin 1.9.18. A public ExploitDB entry exists, but KEV status is false.
Likely exposure
Exposure is most likely on Grav CMS deployments using Admin Plugin 1.9.18 where authenticated users can create pages or edit titles. Public internet exposure increases business impact if compromised content is viewed by administrators or site visitors. The source bundle does not identify other affected versions.
Exploitation context
This is not described as actively exploited in KEV or the provided sources. A public ExploitDB reference indicates proof-of-concept-level public knowledge. Exploitation requires authenticated access and the ability to set a page title, reducing risk compared with unauthenticated flaws but still relevant for shared editorial environments.
Researcher notes
Evidence is limited to the CVE data, VulnCheck advisory, ExploitDB reference, and Grav homepage. The bundle names Grav CMS 1.6.30 with Admin Plugin 1.9.18, but does not provide an official patch notice. Avoid assuming broader version impact without vendor confirmation.
Mitigation direction
- Identify Grav CMS sites running Admin Plugin 1.9.18 or the stated affected stack.
- Check Grav vendor guidance for fixed versions or official remediation.
- Limit page creation and title editing to trusted users only.
- Remove unnecessary or stale Grav admin accounts.
- Review existing page titles for suspicious script-like content.
Validation and detection
- Inventory Grav CMS and Admin Plugin versions across managed sites.
- Confirm whether authenticated users can create or edit page titles.
- Review audit logs for recent page title changes by non-admin users.
- Inspect page titles for unexpected markup or script-like strings.
- Verify remediation against current Grav project guidance.
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-2020-36955 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
- 6.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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:L/UI:N/S:C/C:L/I:L/A:N3.12.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-49264CVE reference · exploit
- Grav CMS Official HomepageCVE reference · product
- VulnCheck Advisory: Grav CMS 1.6.30 Admin Plugin 1.9.18 - 'Page Title' Persistent Cross-Site ScriptingCVE reference · third-party-advisory
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.