[Update] Vulnerability in React Server Components (December 5, 2025)
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
[Update on December 11, 2025] CERT-FR is aware of multiple exploitations of the vulnerability CVE-2025-55182. Servers with a vulnerable version exposed after the public proof of concept release on December 5, 2025, should be considered compromised....
CSIRTS triage
- What
- Multiple exploitations of the vulnerability CVE-2025-55182 have been reported, indicating compromised servers.
- Who is affected
- Servers running vulnerable versions of React Server Components exposed after December 5, 2025.
- Urgency
- Immediate action is critical as servers are likely compromised due to active exploitation.
- Action
- Investigate and patch vulnerable servers immediately.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch React Server Components
Get an email when a new React Server Components advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://www.cert.ssi.gouv.fr/alerte/CERTFR-2025-ALE-014/
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2025-55182Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 100% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2025-55182 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownexploitedCVE-2025-66478: RCE in React Server Componentsaws
- criticalexploitedCVE-2025-55182: Meta React Server Components Remote Code Execution Vulnerabilitycisa-kev
- critical2025-041: Critical Security Vulnerability in React Server Componentscert-eu
Recent advisories for React Server Components
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- unknownexploitedCVE-2025-66478: RCE in React Server Componentsaws · 2026-06-05
- criticalexploitedCVE-2025-55182: Meta React Server Components Remote Code Execution Vulnerabilitycisa-kev · 2025-12-05
- critical2025-041: Critical Security Vulnerability in React Server Componentscert-eu · 2025-12-04
More from CERT-FR Alertes de sécurité
- unknown[Update] Vulnerability in Microsoft Exchange Server (May 15, 2026)2026-05-15
- unknownVulnerability in F5 BIG-IP Access Policy Manager (March 31, 2026)2026-03-31
- unknownAlert note – Targeting instant messaging accounts (March 20, 2026)2026-03-20
- unknown[Update] Vulnerability in Cisco Catalyst SD-WAN (February 25, 2026)2026-02-25
- unknown[Update] Multiple vulnerabilities in Ivanti Endpoint Manager Mobile (January 30, 2026)2026-01-30