CVE-2026-49455

    Dashboard / Vulnerabilities / CVE-2026-49455

    CVE-2026-49455

    Published: 3 Sept 2026Last Modified: 11 Sept 2026

    Summary: Waku: Cross-Origin CSRF on RSC Server Action Dispatch

    Details: Waku is the minimal React framework. Prior to version 1.0.0-beta.1, Waku's RSC request dispatcher invokes server actions without validating the request's Origin (or Sec-Fetch-Site) header. A cross-origin web attacker can therefore cause a victim browser to issue an authenticated POST to a registered server action endpoint using a CORS-safelisted content type (text/plain), which does not trigger a preflight. Any state-mutating server action that the application exposes via 'use server' can be invoked with the victim's cookies attached. This issue has been patched in version 1.0.0-beta.1.

    References: https://github.com/wakujs/waku/releases/tag/v1.0.0-beta.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49455.json, https://github.com/wakujs/waku/security/advisories/GHSA-75w3-gmqx-993q, https://nvd.nist.gov/vuln/detail/CVE-2026-49455

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -5a5f4a48ba18c004d4552cbee15d0e3e1f8ea371

    Affected versions

    v1.0.0-beta.0
    v1.0.0-alpha.10
    v1.0.0-alpha.9
    v1.0.0-alpha.8
    v1.0.0-alpha.7
    v1.0.0-alpha.6
    v1.0.0-alpha.5
    v1.0.0-alpha.4
    v1.0.0-alpha.3
    v1.0.0-alpha.2
    v1.0.0-alpha.1
    v1.0.0-alpha.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-49455 | CVE-DB