Unauthenticated stored XSS via unescaped forwarding header
Published Nov 27, 2023 · Updated Nov 21, 2024
Stored cross-site scripting in Lester Chan WP-UserOnline before 2.88.3 allows remote attackers to inject scripts through an HTTP header. WP-UserOnline records the unsanitized X-Forwarded-For value and later emits it without output escaping on the users-online admin page. Exploitation requires a high-privileged user to open that page, where the injected script executes in that user's browser context.
Summary
What happened
Stored cross-site scripting in Lester Chan WP-UserOnline before 2.88.3 allows remote attackers to inject scripts through an HTTP header. WP-UserOnline records the unsanitized X-Forwarded-For value and later emits it without output escaping on the users-online admin page. Exploitation requires a high-privileged user to open that page, where the injected script executes in that user's browser context.
The record
- CVE
- CVE-2023-5560
- Published
- Nov 27, 2023
- Updated
- Nov 21, 2024
- Vendor
- Lester Chan
- Product
- WP-UserOnline
- Classifications
- CWE-79, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 27, 2023CVE publishedPublication date reported by the CVE source.
- Nov 21, 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=0 <2.88.3
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
- WPScan X-Forwarded-For stored XSS proof of conceptproof of concept · demonstrated
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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