{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-71389 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2025-71389 yet. Limit exposure of the affected software until one is available.","what":"CVE-2025-71389 is a critical unsafe deserialization vulnerability in calcom cal.diy, published on 23 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-71389 and fix it if it is affected.\n\nWhat it is: CVE-2025-71389 is a critical unsafe deserialization vulnerability in calcom cal.diy, published on 23 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-71389 in the wild and no public exploit code.\n\nAffected product: calcom cal.diy. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2025-71389/ (Markdown: https://insights.sbomify.com/CVE-2025-71389/index.md)","id":"CVE-2025-71389","markdown":"https://insights.sbomify.com/CVE-2025-71389/index.md","name":"CVE-2025-71389","record":{"aliases":["GHSA-8449-9vw6-7mp5"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Cal.com scheduling app","requires_auth":"none","summary":"Unauthenticated attackers can execute arbitrary code on Cal.com servers by sending crafted React Server Components requests due to unsafe deserialization.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":10,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0"},"cwes":[{"id":"CWE-94","name":"Improper Control of Generation of Code"}],"description":"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-07-28","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-07-28T12:40:12Z","kind":"github_poc","ref":"https://github.com/0xdak/CVE-2025-71389_exploit","stars":0,"title":null}],"tier":"poc_unverified"},"has_fix":false,"headline":"Cal.com before 5.9.9 Remote Code Execution via RSC","id":"CVE-2025-71389","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"deserialization","year":"2025"},"n_packages":0,"n_references":4,"next":{"headline":"SurrealDB before 2.3.6 deny-net Bypass via DNS Resolution","id":"CVE-2025-71390"},"packages":[],"prev":{"headline":"stoatchat 20241213-1 Webhook Token Disclosure via Read Permissions","id":"CVE-2025-71388"},"products":["cal.diy"],"published":"2026-07-23","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-07-28","vendors":["calcom"]},"summary":"Unauthenticated attackers can execute arbitrary code on Cal.com servers by sending crafted React Server Components requests due to unsafe deserialization.","url":"https://insights.sbomify.com/CVE-2025-71389/"}