CVE-2023-28103

Prototype pollution in matrix-react-sdk

HIGH
8.2
CVSS Score
Published: March 28, 2023 at 08:37 PM UTC
Updated: June 17, 2026 at 05:46 AM UTC
2 products affected across 2 vendorsMatrix React SDKMatrix React SDK

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Severity
HIGH8.2
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

matrix-react-sdk is a Matrix chat protocol SDK for React Javascript. In certain configurations, data sent by remote servers containing special strings in key locations could cause modifications of the `Object.prototype`, disrupting matrix-react-sdk functionality, causing denial of service and potentially affecting program logic. This is fixed in matrix-react-sdk 3.69.0 and users are advised to upgrade. There are no known workarounds for this vulnerability. Note this advisory is distinct from GHSA-2x9c-qwgf-94xr which refers to a similar issue.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 3.69.0
Affected range stops below 3.69.0, so it looks safe — our inference, not a vendor statement
v < 3.69.0
Affected range stops below 3.69.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.2HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-1321

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