Cross-Site Scripting (XSS) in Flowsint
Summary
Cross-site scripting in Flowsint (CVE-2026-42157). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1.2.3 or later.
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-2026-42157 has been found in Flowsint.
Risk of unauthorized operations or information disclosure.
What to do: upgrade Flowsint to 1.2.3 or later.
If unsure, ask your IT team or search "Flowsint CVE-2026-42157" on the vendor's site.
CVE-2026-42157 (Flowsint) — CWE-79
Patched: 1.2.3 — apply immediately
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 Flowsint.
Check the vendor advisory for the affected versions of Flowsint.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1.2.3.
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 'Flowsint' . 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
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1
Identify exposureidentify
grep -r 'Flowsint' . | 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
Flowsintを grep し、稼働しているサービス・バージョンを把握する。 -
2
Apply patchpatch
Upgrade Flowsint to 1.2.3ステージング環境で 1.2.3 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3
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.
Flowsint is an open-source OSINT graph exploration tool designed for cybersecurity investigation, transparency, and verification. Prior to 1.2.3, a remote attacker can create a map node with a malicious label that contains arbitrary HTML. When the map tab is selected and a map node marker is selected, it will render the arbitrary HTML, potentially triggering stored XSS. This vulnerability is fixed in 1.2.3.
Source: NIST National Vulnerability Database NVD GitHub Advisory
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov