Stored script execution via unneutralized chat markup
Published Feb 10, 2021 · Updated Aug 3, 2024
Stored XSS in the disputed Henriquedornas website claim allows attackers to execute script in a visitor's browser through live chat. The allegation is that live chat stores supplied markup and later renders it without neutralizing an onerror handler; no code path or input field is identified. Exploitation requires low-privileged chat access and a visitor who loads the stored content; the claim is disputed because no versioned product was identified and 5.2.17 denotes PHP.
Summary
What happened
Stored XSS in the disputed Henriquedornas website claim allows attackers to execute script in a visitor's browser through live chat. The allegation is that live chat stores supplied markup and later renders it without neutralizing an onerror handler; no code path or input field is identified. Exploitation requires low-privileged chat access and a visitor who loads the stored content; the claim is disputed because no versioned product was identified and 5.2.17 denotes PHP.
The record
- CVE
- CVE-2021-26938
- Published
- Feb 10, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-79
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 10, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 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?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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.
Weakness, pattern, technique
Public exploit references
- GitHub discussion markup payloadproof of concept · unverified
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Technologies
Your stack
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Your stack
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