CVE-2020-28707Public exploitNetwork attack vector

Cross-site scripting via unvalidated postMessage evaluation

Published Jan 19, 2021 · Updated Jul 9, 2026

Cross-site scripting in Stockdio Historical Chart before 2.8.1 allows remote attackers to execute JavaScript via a crafted message. The stockdio_eventer function in stockdio_chart_historical-wp.js accepts postMessage events from any origin and passes data.method to eval(). A victim must visit an attacker-controlled page that opens the vulnerable WordPress page; the resulting script runs in that site's browser origin and can read or alter data accessible to the victim.

CVSS severity6.1
Medium
EPSS probability1.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Stockdio Historical Chart before 2.8.1 allows remote attackers to execute JavaScript via a crafted message. The stockdio_eventer function in stockdio_chart_historical-wp.js accepts postMessage events from any origin and passes data.method to eval(). A victim must visit an attacker-controlled page that opens the vulnerable WordPress page; the resulting script runs in that site's browser origin and can read or alter data accessible to the victim.

The record

CVE
CVE-2020-28707
Published
Jan 19, 2021
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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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