Security readout for executives and security teams
Plain-English summary
CVE-2018-6341 is an XSS issue in React server-side rendering. Some React applications using ReactDOMServer did not escape user-supplied attribute names when generating HTML. If an attacker could influence those attribute names and a user viewed the resulting page, script execution could occur.
Executive priority
Treat this as a targeted moderate-risk dependency issue. It warrants remediation where older server-rendered React is exposed to users, but the provided evidence does not support emergency handling for active exploitation.
Technical view
The flaw affects react-dom minor lines 16.0.x through 16.4.x before the listed fixed patch releases. It is CWE-79 with CVSS 3.1 score 6.1. The vulnerable path is ReactDOMServer render-time HTML generation when user-supplied attribute names are emitted without escaping.
Likely exposure
Exposure is most likely in older server-rendered React applications pinned to affected react-dom 16.0.x through 16.4.x versions and accepting dynamic attribute names from untrusted input. Client-only React applications are less directly indicated by the source description.
Exploitation context
The provided sources do not state known active exploitation, and the CVE is not marked KEV. The CVSS vector indicates network reachability, low attack complexity, no privileges, and user interaction required, consistent with reflected or stored XSS impact when vulnerable rendering is reachable.
Researcher notes
Key evidence is narrow: ReactDOMServer, user-supplied attribute names, and affected 16.0.x through 16.4.x minor lines with specific fixed patch releases. Do not broaden this to all React usage without confirming server-side rendering and vulnerable dependency versions.
Mitigation direction
- Upgrade react-dom to 16.0.1, 16.1.2, 16.2.1, 16.3.3, 16.4.2, or later as applicable.
- Check React vendor release guidance before choosing a target version.
- Avoid rendering untrusted input as attribute names through ReactDOMServer.
- Prioritize internet-facing SSR applications and user-generated content paths.
Validation and detection
- Inspect package manifests and lockfiles for react-dom 16.0.x through 16.4.x versions.
- Confirm whether the application uses ReactDOMServer for server-side HTML rendering.
- Review SSR code paths for dynamic attribute names influenced by users.
- Verify upgraded builds resolve to a fixed react-dom patch level.
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-2018-6341 mapping review
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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://reactjs.org/blog/2018/08/01/react-v-16-4-2.htmlCVE reference · x_refsource_MISC
- https://twitter.com/reactjs/status/1024745321987887104CVE 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.