CVE-2026-118129: jeremyckahn Chitchatter PostMessage Bootstrap.tsx isConfigMessageEvent improper authentication
A vulnerability was found in jeremyckahn Chitchatter up to f82538633813c854a81a8b2112a2f6ba17b39cbc. The affected element is the function isConfigMessageEvent of the file src/Bootstrap.tsx of the component PostMessage Handler. Performing a manipulation of the argument parentDomain results in improper authentication. Remote exploitation of the attack is possible. The exploit has been made public and could be used. This product follows a rolling release approach for continuous delivery, so version details for affected or updated releases are not provided. The patch is named e3babb5cd83bfe3b99f1d82358ac5c1ea8e8a688. It is recommended to apply a patch to fix this issue. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch e3babb5cd83bfe3b99f1d82358ac5c1ea8e8a688
Event History
Frequently Asked Questions
What does an attacker need to exploit this issue?
The issue can be exploited remotely by manipulating the parentDomain argument handled by the PostMessage Handler. No privileges are required, but user interaction is required according to the supplied severity vector.
Are fixed and affected release versions available?
No version mapping is provided because the product uses a rolling-release delivery model. The available remediation identifier is patch commit e3babb5cd83bfe3b99f1d82358ac5c1ea8e8a688.
How urgent is remediation?
A public exploit is available, and remote exploitation is possible. Apply the identified patch promptly, especially where the affected PostMessage functionality is reachable by untrusted content or users.