CVE-2025-71389: Cal.com (calcom/cal.diy) before 5.9.9 is vulnerable to unauthenticated remote code execution because it bundles a version of Next.js whose React Server Components (RSC) request han
Cal.com (calcom/cal.diy) before 5.9.9 is vulnerable to unauthenticated remote code execution because it bundles a version of Next.js whose React Server Components (RSC) request handling deserializes attacker-controlled input. A remote attacker can send a crafted RSC request to the server and cause arbitrary code to be executed during server-side processing, without authentication or user interaction. The flaw derives from the upstream Next.js vulnerability CVE-2025-55182 and is resolved in 5.9.9 by updating the affected dependency.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-71389
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.
- Low exploitation riskCVE-2025-713890.93% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 57% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2025-71389 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for Cal.com
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.
- highCVE-2024-58355: Cal.com (calcom/cal.diy) versions through 4.7.15 contain a stored cross-site scripting vulnera…nvd · 2026-07-23
- criticalCVE-2024-58354: cal.com (calcom repository, later renamed cal.diy) is affected by a repository takeover vulner…nvd · 2026-07-23
- highCVE-2024-58353: Cal.com (repository calcom/cal.diy) in versions ). Bookingnvd · 2026-07-23
- criticalCVE-2026-16624: Cal.com OSS ships lacks authorization on webhook teamId creation, allowing any authenticated u…nvd · 2026-07-22
More from NVD Recent CVEs
- highCVE-2026-19190: A weakness has been identified in StableBit Scanner 2.6.13.4088. This affects an unknown part …2026-08-07
- unknownCVE-2026-49746: Software installed and run as a non-privileged user may conduct improper GPU system calls to c…2026-08-07
- unknownCVE-2026-45204: Software installed and run as a non-privileged user may conduct improper GPU system calls to t…2026-08-07
- unknownCVE-2026-45198: Kernel software from a non-secure operating system on a platform with Trusted Execution Enviro…2026-08-07
- highCVE-2026-19189: A security flaw has been discovered in Power Sofware PowerISO 9.3.0.0. Affected by this issue …2026-08-07