VDB-427456 · Submit #1015027 · CVE-2026-118129

jeremyckahn Chitchatter up to f82538633813c854a81a8b2112a2f6ba17b39cbc PostMessage src/Bootstrap.tsx isConfigMessageEvent parentDomain improper authentication

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.7	$0-$5k	1.90+

Summaryinfo

A vulnerability categorized as critical has been discovered in jeremyckahn Chitchatter up to f82538633813c854a81a8b2112a2f6ba17b39cbc. The impacted element is the function isConfigMessageEvent of the file src/Bootstrap.tsx of the component PostMessage Handler. Executing a manipulation of the argument parentDomain can lead to improper authentication. This vulnerability is handled as CVE-2026-118129. The attack can be executed remotely. Additionally, an exploit exists. This product implements a rolling release for ongoing delivery, which means version information for affected or updated releases is unavailable. Applying a patch is advised to resolve this issue. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Detailsinfo

A vulnerability classified as critical was found in jeremyckahn Chitchatter up to f82538633813c854a81a8b2112a2f6ba17b39cbc. This vulnerability affects the function isConfigMessageEvent of the file src/Bootstrap.tsx of the component PostMessage Handler. The manipulation of the argument parentDomain with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-118129. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details and also a public exploit are known.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Applying the patch e3babb5cd83bfe3b99f1d82358ac5c1ea8e8a688 is able to eliminate this problem. The bugfix is ready for download at github.com.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

jeremyckahn

Name

Chitchatter

Version

f82538633813c854a81a8b2112a2f6ba17b39cbc

License

open-source

Website

Product: https://github.com/jeremyckahn/chitchatter/

CPE 2.3info

🔒

CPE 2.2info

🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 5.7

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: e3babb5cd83bfe3b99f1d82358ac5c1ea8e8a688

Timelineinfo

10/27/2026 Advisory disclosed
10/27/2026 +0 days VulDB entry created
10/27/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2026-118129 (🔒)
GCVE (CVE): GCVE-0-2026-118129
GCVE (VulDB): GCVE-100-427456
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 10/27/2026 17:54
Updated: 10/27/2026 17:57
Changes: 10/27/2026 17:54 (62), 10/27/2026 17:57 (1)
Complete: 🔍
Submitter: chenhuanlin
Cache ID: 216::103

Submitinfo

Accepted

Submit #1015027: jeremyckahn Chitchatter develop branch @ 23b62a8 (source) authentication bypass / identity takeover (by chenhuanlin)