CVE-2026-118129 jeremyckahn Chitchatter PostMessage Bootstrap.tsx isConfigMessageEvent improper authentication
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-118129?
CVE-2026-118129 is a medium-severity vulnerability in jeremyckahn Chitchatter, published on 27 Oct 2026.
Official description
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.
Weakness: CWE-287
Which versions are affected by CVE-2026-118129?
How do I fix CVE-2026-118129?
No fix has been published for CVE-2026-118129 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-118129 being exploited?
There is no known exploitation of CVE-2026-118129 in the wild and no public exploit code.
Sources
Also known as GHSA-4rhf-9gx6-4pqp.