Cross-site scripting via unescaped array content
Published Oct 7, 2021 · Updated Sep 16, 2024
Cross-site scripting in Teddy before 0.5.9 allows remote attackers to inject executable markup through array-valued model content. The escapeEntities function returns arrays without encoding their elements, so rendering converts malicious array content into raw HTML. Exploitation requires an application to pass attacker-controlled array data into a template and a user to render the resulting page; script then runs in that page's browser context.
Summary
What happened
Cross-site scripting in Teddy before 0.5.9 allows remote attackers to inject executable markup through array-valued model content. The escapeEntities function returns arrays without encoding their elements, so rendering converts malicious array content into raw HTML. Exploitation requires an application to pass attacker-controlled array data into a template and a user to render the resulting page; script then runs in that page's browser context.
The record
- CVE
- CVE-2021-23447
- Published
- Oct 7, 2021
- Updated
- Sep 16, 2024
- Vendor
- Roosevelt Web Framework
- Product
- Teddy
- Classifications
- CWE-843, CWE-79, T1059.007
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 7, 2021CVE publishedPublication date reported by the CVE source.
- 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.
- Affected versionversion=unspecified <0.5.9
What conditions does exploitation require?
What is affected?
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
- Snyk Teddy array sanitization bypass proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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