Cross-Site Scripting (XSS) in HTMLy
Summary
Cross-site scripting in HTMLy (CVE-2026-38949). Confidential information can be exposed externally.
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-38949 has been found in HTMLy.
Confidential information can be exposed externally. CVSS score: 8.9/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "HTMLy CVE-2026-38949" on the vendor's site.
CVE-2026-38949 (HTMLy) — CWE-79 / CVSS v3 8.9
Attack vector: remote (network-reachable)
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Cross-site scripting (XSS) (CWE-79) exists in HTMLy.
Check the vendor advisory for the affected versions of HTMLy.
Severity: High (CVSS 8.9/10). Confidential information can be exposed externally.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'HTMLy' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1
Identify exposureidentify
grep -r 'HTMLy' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
HTMLyを grep し、稼働しているサービス・バージョンを把握する。 -
2
Post-deployment verificationverify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Original description The description as published by the source.
Cross-Site Scripting (XSS) vulnerability exists in HTMLy version 3.1.1 in the content creation functionality at the /add/content?type=image endpoint. The application fails to properly sanitize user input, allowing injection of arbitrary code
Source: NIST National Vulnerability Database NVD GitHub Advisory
References
- web github.com
- web github.com
- web youtu.be
- web nvd.nist.gov
- web github.com