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  4. CVE 2026 118129 jeremyckahn chitchatter postmessage bootstraptsx
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Back to active CVEs
Medium · CVSS 5.3CVE-2026-118129

jeremyckahn Chitchatter PostMessage Bootstrap.tsx isConfigMessageEvent improper authenticationCVE-2026-118129

Answer in brief

CVE-2026-118129 records a Medium severity (CVSS 5.3) vulnerability in jeremyckahn Chitchatter PostMessage Bootstrap.tsx isConfigMessageEvent improper authentication. The current sources do not mark it as known exploited. The current feed maps jeremyckahn/Chitchatter (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 27, 2026Updated Oct 27, 2026Source checked Oct 28, 2026First seen by HOL Oct 27, 2026Material review Oct 27, 2026
Upstream Advisory

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-287
Source
CVE List V5
Source checked
Oct 28, 2026
References
8 linked sources
Open source record

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps jeremyckahn/Chitchatter (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
jeremyckahn/Chitchattergenericf82538633813c854a81a8b2112a2f6ba17b39cbcNot reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for jeremyckahn/Chitchatter.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Oct 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 27, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevuldb.com
  • Source referencevuldb.com
  • Source referencevuldb.com
  • Source referencevuldb.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.