CVE-2020-21268Public exploitNetwork attack vector

Session-cookie theft via stored comment markup

Published Jun 20, 2023 · Updated Dec 9, 2024

Stored XSS in Product Overview comments in EasySoft ZenTao 11.6.4 allows remote attackers to execute script in another user's browser. The comment-editing request stores lastComment without neutralizing injected img or div event-handler markup, which executes when the saved comment is rendered. Exploitation requires another user to view or interact with the crafted comment, exposing that user's session cookies and permitting actions in that browser context.

CVSS severity6.1
Medium
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Product Overview comments in EasySoft ZenTao 11.6.4 allows remote attackers to execute script in another user's browser. The comment-editing request stores lastComment without neutralizing injected img or div event-handler markup, which executes when the saved comment is rendered. Exploitation requires another user to view or interact with the crafted comment, exposing that user's session cookies and permitting actions in that browser context.

The record

CVE
CVE-2020-21268
Published
Jun 20, 2023
Updated
Dec 9, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 9, 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?

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

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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
T1539Steal Web Session Cookie

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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