CVE-2026-49455Public exploitNetwork attack vectorHinoki check available

Unauthorized state changes via unchecked RSC origin

Published Sep 3, 2026 · Updated Sep 3, 2026

CSRF in Waku before 1.0.0-beta.1 allows remote attackers to invoke state-mutating server actions through a victim's browser. The RSC request dispatcher decodes a cross-origin text/plain POST and loads the requested action without checking Origin or Sec-Fetch-Site. A victim must load attacker-controlled content while authenticated, and the application must expose a state-mutating 'use server' action.

CVSS severity6.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

CSRF in Waku before 1.0.0-beta.1 allows remote attackers to invoke state-mutating server actions through a victim's browser. The RSC request dispatcher decodes a cross-origin text/plain POST and loads the requested action without checking Origin or Sec-Fetch-Site. A victim must load attacker-controlled content while authenticated, and the application must expose a state-mutating 'use server' action.

The record

CVE
CVE-2026-49455
Published
Sep 3, 2026
Updated
Sep 3, 2026
Vendor
Waku
Product
Waku
Classifications
CWE-352, CAPEC-62, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.0.0-beta.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Waku · Wakuversion=< 1.0.0-beta.1

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CAPEC-62Cross Site Request Forgery
T1204.001Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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