Security readout for executives and security teams
Plain-English summary
CKEditor 4 can run attacker-supplied JavaScript when malformed widget HTML is handled through the vulnerable undo workflow. The issue matters for applications that let users create or edit rich text, because stored or workflow-driven content could affect other users who open or interact with it.
Executive priority
Treat as high priority for internet-facing or multi-user editing systems. Patch during the next urgent maintenance window, faster where rich-text content is shared across trust levels.
Technical view
CVE-2021-32808 is a CWE-79 cross-site scripting flaw in CKEditor 4. It affects versions 4.13.0 through before 4.16.2 when the clipboard Widget plugin is used alongside undo functionality. CVSS 3.1 is 7.6 with low attack complexity, low privileges required, user interaction required, and changed scope.
Likely exposure
Exposure is most likely in web applications embedding CKEditor 4 between 4.13.0 and 4.16.1 with the affected plugin combination enabled, especially content management, admin, support, or portal editing workflows.
Exploitation context
The bundle does not show KEV listing or active exploitation. The CVSS vector indicates exploitation needs low privileges and user interaction, but the impact can cross security boundaries and expose sensitive browser-accessible data.
Researcher notes
Evidence supports affected CKEditor 4 versions >=4.13.0 and <4.16.2, patched in 4.16.2. Do not assume all CKEditor deployments are exposed; plugin usage and embedding context determine practical risk. No exploit status is established in the provided sources.
Mitigation direction
- Upgrade CKEditor 4 to version 4.16.2 or later.
- Check vendor-packaged CKEditor copies, including Fedora or Oracle-distributed products.
- Inventory embedded, bundled, and static CKEditor assets in applications.
- If upgrade is delayed, consult CKEditor/vendor guidance before relying on configuration workarounds.
Validation and detection
- Confirm every CKEditor 4 instance reports version 4.16.2 or later.
- Identify whether the clipboard Widget plugin and undo feature are enabled together.
- Review dependency manifests, vendored assets, and built frontend bundles.
- Confirm vendor advisories are applied for OS or third-party product packages.
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-2021-32808 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:C/C:H/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:R/S:C/C:H/I:L/A:N2.34.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.6HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-6226-h7ff-ch6cCVE reference · x_refsource_CONFIRM
- https://github.com/ckeditor/ckeditor4/releases/tag/4.16.2CVE reference · x_refsource_MISC
- FEDORA-2021-51457da891CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-72176a63a8CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-87578dca12CVE reference · vendor-advisory, x_refsource_FEDORA
- https://www.oracle.com/security-alerts/cpuoct2021.htmlCVE reference · x_refsource_MISC
- https://www.oracle.com/security-alerts/cpujan2022.htmlCVE 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.