CVE-2026-118129
jeremyckahn Chitchatter PostMessage Bootstrap.tsx isConfigMessageEvent improper authentication
- State
- Published
- Severity
- 5.3 Medium
- Published
- Oct 27, 2026
- Updated
- Oct 27, 2026
- Reserved
- Oct 27, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P | VulDB |
| 3.1 | 6.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C | VulDB |
| 3.0 | 6.3 Medium | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C | VulDB |
| 2.0 | 7.5 High | AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C | VulDB |
Weaknesses
- CWE-287 Improper Authentication
Affected Products
| Product | Versions |
|---|---|
Chitchatterjeremyckahn |
|
References
- VDB-427456 | jeremyckahn Chitchatter PostMessage Bootstrap.tsx isConfigMessageEvent improper authenticationvdb-entrytechnical-description
- VDB-427456 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
- CVE-2026-118129 | CVE Analysis and Reportthird-party-advisory
- Submit #1015027 | jeremyckahn Chitchatter develop branch @ 23b62a8 (source) authentication bypass / identity takeoverthird-party-advisory
- https://github.com/0xGenesi/CVE/blob/main/Chitchatter_SDK_postMessage_Identity_Key_Injection.mdexploit
- https://github.com/jeremyckahn/chitchatter/pull/635issue-trackingpatch
- https://github.com/jeremyckahn/chitchatter/commit/e3babb5cd83bfe3b99f1d82358ac5c1ea8e8a688patch
- https://github.com/jeremyckahn/chitchatter/product
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