CVE-2020-28480Public exploitNetwork attack vector

Prototype pollution via unsanitized setByPath paths

Published Jan 19, 2021 · Updated Sep 16, 2024

Prototype pollution in client IO JointJS before 3.3.0 allows attackers to alter inherited object properties through crafted paths. The util.setByPath function traverses attacker-controlled property names and assigns values without rejecting prototype-chain keys. Exposure requires a consuming application to pass untrusted path data to the function, and successful exploitation can corrupt application object state.

CVSS severity7.3
High
EPSS probability1.36%
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 client IO JointJS before 3.3.0 allows attackers to alter inherited object properties through crafted paths. The util.setByPath function traverses attacker-controlled property names and assigns values without rejecting prototype-chain keys. Exposure requires a consuming application to pass untrusted path data to the function, and successful exploitation can corrupt application object state.

The record

CVE
CVE-2020-28480
Published
Jan 19, 2021
Updated
Sep 16, 2024
Vendor
client IO
Product
JointJS
Classifications
CWE-1321
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <3.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

client IO · JointJSversion=unspecified <3.3.0

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.3SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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.

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No observations available

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

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

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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