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TI-2023-18889 Aliases CVE-2023-37259GHSA-c9vx-2g7w-rp65

Cross site scripting in Export Chat feature

Priority LOW 28CWE-79Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

matrix-react-sdk is a react-based SDK for inserting a Matrix chat/voip client into a web page. The Export Chat feature includes certain attacker-controlled elements in the generated document without sufficient escaping, leading to stored Cross site scripting (XSS). Since the Export Chat feature generates a separate document, an attacker can only inject code run from the `null` origin, restricting the impact. However, the attacker can still potentially use the XSS to leak message contents. A malicious homeserver is a potential attacker since the affected inputs are controllable server-side. This issue has been addressed in commit `22fcd34c60` which is included in release version 3.76.0. Users are advised to upgrade. The only known workaround for this issue is to disable or to not use the Export Chat feature.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00452 39th percentileScored 2026-11-07
Fix Fixed matrix-react-sdk (matrix-org): 3.76.0matrix-react-sdk (npm): 3.76.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
matrix-orgmatrix-react-sdk3.32.0 to before 3.76.03.76.0Patch availableCNA
—matrix-react-sdk (npm)3.32.0 to before 3.76.03.76.0Patch availableGHSA-c9vx-2g7w-rp65
  • matrix-react-sdk Vendormatrix-org Affected 3.32.0 to before 3.76.0 Fixed in 3.76.0 Patch available CNA
  • matrix-react-sdk (npm) Vendor— Affected 3.32.0 to before 3.76.0 Fixed in 3.76.0 Patch available GHSA-c9vx-2g7w-rp65

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:matrix-react-sdk_project:matrix-react-sdk:*:*:*:*:*:node.js:*:*3.32.0 to before 3.76.0VulnerableMatrix-react-sdk Project
cpe:2.3:a:matrix-react-sdk_project:matrix-react-sdk:3.76.0:rc1:*:*:*:node.js:*:*3.76.0 rc1VulnerableMatrix-react-sdk Project
cpe:2.3:a:matrix-react-sdk_project:matrix-react-sdk:3.76.0:rc2:*:*:*:node.js:*:*3.76.0 rc2VulnerableMatrix-react-sdk Project
  • cpe:2.3:a:matrix-react-sdk_project:matrix-react-sdk:*:*:*:*:*:node.js:*:* Versions 3.32.0 to before 3.76.0 Vulnerable ·Matrix-react-sdk Project
  • cpe:2.3:a:matrix-react-sdk_project:matrix-react-sdk:3.76.0:rc1:*:*:*:node.js:*:* Versions 3.76.0 rc1 Vulnerable ·Matrix-react-sdk Project
  • cpe:2.3:a:matrix-react-sdk_project:matrix-react-sdk:3.76.0:rc2:*:*:*:node.js:*:* Versions 3.76.0 rc2 Vulnerable ·Matrix-react-sdk Project

Remediation

  • Fix · CNA matrix-react-sdk (matrix-org) Fixed in 3.76.0
  • Fix · GHSA-c9vx-2g7w-rp65 matrix-react-sdk (npm) Fixed in 3.76.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-37259
  2. 2026-10-03 Alias added: GHSA-c9vx-2g7w-rp65

References

Patch 1

Advisory 2

Other 2

  • TI-2023-20035 Sydent does not verify email server certificates CVSS 3.1CRITICAL 9.3
  • TI-2026-45046 Dendrite 0.13.8 SSRF via Unauthenticated Legacy Media Download Endpoint CVSS 4.0MEDIUM 6.9
  • TI-2026-45045 Dendrite 0.13.8 Improper Authorization via POST account/3pid/delete Endpoint CVSS 4.0HIGH 7.1
  • TI-2026-45047 Dendrite 0.13.8 syncapi /context Endpoint Post-Leave State Exposure CVSS 4.0MEDIUM 5.3
  • TI-2023-15617 Synapse Outgoing federation to specific hosts can be disabled by sending malicious invites CVSS 3.1MEDIUM 5.0
  • TI-2023-20039 matrix-appservice-irc IRC command injection via admin commands containing newlines CVSS 3.1CRITICAL 9.8
See all 115 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences