Stored XSS via duplicated request-header value
Published Jan 22, 2022 · Updated Aug 3, 2024
Stored XSS in ShowDoc before 2.10.2 allows remote authenticated users to execute script in another user’s browser through a crafted API header value. The rederPageContent function inserts each request-header example value twice into generated Markdown, leaving an unneutralized extra copy outside the intended table schema. An attacker needs permission to edit a document, and execution occurs when another user views the rendered page.
Summary
What happened
Stored XSS in ShowDoc before 2.10.2 allows remote authenticated users to execute script in another user’s browser through a crafted API header value. The rederPageContent function inserts each request-header example value twice into generated Markdown, leaving an unneutralized extra copy outside the intended table schema. An attacker needs permission to edit a document, and execution occurs when another user views the rendered page.
The record
- CVE
- CVE-2021-4172
- Published
- Jan 22, 2022
- Updated
- Aug 3, 2024
- Vendor
- ShowDoc
- Product
- ShowDoc
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 22, 2022CVE 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <2.10.2
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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