CVE-2020-18066Public exploitNetwork attack vector

Session-cookie theft via stored comment-field XSS

Published Jun 29, 2021 · Updated Aug 4, 2024

Stored cross-site scripting in ZrLog 2.1.0 allows remote attackers to steal viewer session cookies through malicious comments. The post/addComment handler accepts userName and email values containing HTML event-handler markup, stores them with the comment, and later renders them without neutralizing executable content. No authentication is required to submit the comment, but a viewer or administrator must open the affected front-end or comment-management page for the script to execute in that account's browser context.

CVSS severity6.1
Medium
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in ZrLog 2.1.0 allows remote attackers to steal viewer session cookies through malicious comments. The post/addComment handler accepts userName and email values containing HTML event-handler markup, stores them with the comment, and later renders them without neutralizing executable content. No authentication is required to submit the comment, but a viewer or administrator must open the affected front-end or comment-management page for the script to execute in that account's browser context.

The record

CVE
CVE-2020-18066
Published
Jun 29, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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
4.3NVDAV: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')
T1189Drive-by Compromise

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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