CVE-2023-28427 | Prototype pollution in matrix-js-sdk

matrix-js-sdk is a Matrix messaging protocol Client-Server SDK for JavaScript. In versions prior to 24.0.0 events sent with special strings in key places can temporarily disrupt or impede the matrix-js-sdk from functioning properly, potentially impacting the consumer's ability to process data safely. Note that the matrix-js-sdk can appear to be operating normally but be excluding or corrupting runtime data presented to the consumer. This vulnerability is distinct from GHSA-rfv9-x7hh-xc32 which covers a similar issue. The issue has been patched in matrix-js-sdk 24.0.0 and users are advised to upgrade. There are no known workarounds for this vulnerability.

Published: 2023-03-28 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-28427 is rated Moderate Risk (57.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.60%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-28427

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-31 0.25% 0.60% +0.36%
2 2026-04-19 0.36% 0.25% -0.11%
3 2026-01-09 — 0.36% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-28427

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.2 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 4.2 [email protected]
8.2 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 4.2 [email protected]

Weakness enumeration for CVE-2023-28427

GitHub Security Advisory for CVE-2023-28427

GHSA-mwq8-fjpf-c2gr · Severity: high · Ecosystem: npm — Prototype pollution in matrix-js-sdk (part 2)

OS Trackers for CVE-2023-28427

vendor priority summary link
alpine high CVE-2023-28427: 2 source package rows (element-web, riot-web); 8 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 8, open 0. https://security.alpinelinux.org/vuln/CVE-2023-28427
debian not yet assigned CVE-2023-28427 not yet assigned priority: Debian including 2 source packages (node-matrix-js-sdk, thunderbird), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5, open 1. https://security-tracker.debian.org/tracker/CVE-2023-28427
gentoo high CVE-2023-28427: 1 GLSA(s) (202305-36), 2 atom(s) (mail-client/thunderbird, mail-client/thunderbird-bin); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-28427
redhat high — https://access.redhat.com/security/cve/CVE-2023-28427
suse high CVE-2023-28427 severity important: SUSE including 10 source package names (MozillaThunderbird-102.10.0-1.1, MozillaThunderbird-102.9.1-150200.8.110.2, …), 40 product×package rows across 16 product lines (SUSE Liberty Linux 7, SUSE Liberty Linux 8, … (16 product lines)): Fixed 40. https://www.suse.com/security/cve/CVE-2023-28427/
ubuntu medium CVE-2023-28427 medium priority: Ubuntu including 1 source packages (node-matrix-js-sdk), 13 status rows across 13 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 6, needs-triage 4, DNE 3. https://ubuntu.com/security/CVE-2023-28427

Affected software / configurations for CVE-2023-28427

Vendor Product Version Raw CPE
matrix javascript_sdk < 24.0.0 cpe:2.3:a:matrix:javascript_sdk:*:*:*:*:*:node.js:*:*

References for CVE-2023-28427

cvelogic Threat Intelligence