CVE-2023-45811Public exploit

Arbitrary code execution via LiteralMap prototype pollution

Published Oct 17, 2023 · Updated Sep 13, 2024

Prototype pollution in Relative Synchrony 2.0.1 through 2.4.3 allows local users to execute arbitrary code through crafted JavaScript. The LiteralMap transformer accepts a proto property and places an attacker-controlled parser path on Object.prototype, which Prettier later resolves with require(). Exploitation requires processing the crafted file under Node.js with the legacy proto accessor enabled, and code runs with the Synchrony process's privileges.

CVSS severity8.1
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in Relative Synchrony 2.0.1 through 2.4.3 allows local users to execute arbitrary code through crafted JavaScript. The LiteralMap transformer accepts a proto property and places an attacker-controlled parser path on Object.prototype, which Prettier later resolves with require(). Exploitation requires processing the crafted file under Node.js with the legacy proto accessor enabled, and code runs with the Synchrony process's privileges.

The record

CVE
CVE-2023-45811
Published
Oct 17, 2023
Updated
Sep 13, 2024
Vendor
Relative
Product
Synchrony
Classifications
CWE-1321, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 13, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.0.1, < 2.4.4
  2. Affected versionversion=2.0.1 <2.4.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Relative · Synchronyversion=>= 2.0.1, < 2.4.4; version=2.0.1 <2.4.4

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.1GitHubCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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