Vulnerability in parse-server (CVE-2026-43930)
Summary
Vulnerability in parse-server (CVE-2026-43930). Data can be tampered with by attackers. Exploitable via applyAuthDataOptimisticLock. Mitigation: upgrade to 8.6.76 or later.
Original description
The description as published by the source.
Impact
A race condition in the MFA SMS one-time password (OTP) login path allows two concurrent /login requests carrying the same OTP to both succeed and both receive valid session tokens, breaking the single-use property of the OTP. The vulnerability requires the attacker to already possess the victim's password and intercept the active SMS OTP (e.g. via SIM swap, network mirror, or phishing relay) and to race the legitimate login request, so the practical attack surface is narrow.
This advisory is the same class of incomplete fix as GHSA-2299-ghjr-6vjp (TOTP recovery codes) and GHSA-w73w-g5xw-rwhf (MFA recovery in authData-only login). Those previous fixes added optimistic locking only for array-typed authData fields; SMS MFA stores the OTP as a string, so the guard skipped it.
Patches
The optimistic lock has been generalized to cover primitive (string, number, boolean) and array authData fields. The lock is implemented as a shared helper applyAuthDataOptimisticLock that adds equality predicates on the original values of changed fields to the update WHERE clause. Concurrent writers racing the same single-use token now miss the WHERE condition and surface as Invalid auth data.
Workarounds
- Disable SMS MFA and use TOTP instead (TOTP tokens are time-window validated, not st…
Source: NIST National Vulnerability Database 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-2026-43930 has been found in parse-server.
Attackers can target a specific entry point like applyAuthDataOptimisticLock over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 5.9/10.
What to do: upgrade parse-server to 8.6.76 or later.
If unsure, ask your IT team or search "parse-server CVE-2026-43930" on the vendor's site.
CVE-2026-43930 (parse-server) — CWE-362 / CVSS v3 5.9
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: applyAuthDataOptimisticLock
Patched: 8.6.76 — 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-362) exists in parse-server. Attackers reach the vulnerable code path via applyAuthDataOptimisticLock without authentication.
Check the vendor advisory for the affected versions of parse-server. Attack surface: applyAuthDataOptimisticLock.
Severity: Medium (CVSS 5.9/10). Data can be tampered with by attackers.
Update to 8.6.76.
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 'parse-server' . 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
-
1Identify exposure identify
grep -r 'parse-server' . | 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
parse-server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 parse-server to 8.6.76ステージング環境で 8.6.76 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 nvd.nist.gov
- package github.com
- patch security-advisories@github.com
- patch security-advisories@github.com
- patch security-advisories@github.com
- web github.com