Vulnerability in @actual-app/web (CVE-2026-50179)
Summary
Vulnerability in @actual-app/web (CVE-2026-50179). Risk of unauthorized operations or information disclosure. Exploitable via exportToCSV. Mitigation: upgrade to 26.6.0 or later.
Original description
The description as published by the source.
Actual is a local-first personal finance tool. Prior to 26.6.0, exportToCSV and exportQueryToCSV in packages/loot-core/src/server/transactions/export/export-to-csv.ts pass user-controlled Payee, Notes, Account, and Category strings to csv-stringify with no cast callback and no formula-prefix neutralization. Strings that begin with equals sign, plus, minus, at sign, tab, or carriage return survive verbatim into the exported CSV, and when a recipient opens the file in Excel, LibreOffice Calc, or Google Sheets, the strings are interpreted as formulas, enabling transaction data exfiltration and attacker-chosen spreadsheet display values. This issue is fixed in version 26.6.0.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
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-2026-50179 has been found in @actual-app/web.
Attackers can target a specific entry point like exportToCSV over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 4.2/10.
What to do: upgrade @actual-app/web to 26.6.0 or later.
If unsure, ask your IT team or search "@actual-app/web CVE-2026-50179" on the vendor's site.
CVE-2026-50179 (@actual-app/web) — CWE-1236 / CVSS v3 4.2
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: exportToCSV / exportQueryToCSV / Payee / Notes
Patched: 26.6.0 — 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.
A vulnerability (CWE-1236) exists in @actual-app/web. Attackers reach the vulnerable code path via exportToCSV without authentication.
Check the vendor advisory for the affected versions of @actual-app/web. Attack surface: exportToCSV / exportQueryToCSV / Payee / Notes.
Severity: Medium (CVSS 4.2/10). Risk of unauthorized operations or information disclosure.
Update to 26.6.0.
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 '@actual-app/web' . 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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1Identify exposure identify
grep -r '@actual-app/web' . | 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
@actual-app/webを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade @actual-app/web to 26.6.0ステージング環境で 26.6.0 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。
-
3Post-deployment verification verify
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。
Affected packages
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- patch github.com
- web github.com
- web github.com