Script execution via unescaped innerHTML reinsertion
Published Mar 13, 2026 · Updated Mar 13, 2026
Cross-site scripting in @leanprover/unicode-input-component before 0.2.0 allows attackers to execute script via crafted component text. An event handler reads escaped element content through innerText, then writes the decoded text through innerHTML without re-escaping attacker-supplied tags. Exploitation requires attacker-controlled component text, such as a query parameter, and active user interaction with a handler; the published assessment reports no direct vulnerable-system or subsequent-system impact.
Summary
What happened
Cross-site scripting in @leanprover/unicode-input-component before 0.2.0 allows attackers to execute script via crafted component text. An event handler reads escaped element content through innerText, then writes the decoded text through innerHTML without re-escaping attacker-supplied tags. Exploitation requires attacker-controlled component text, such as a query parameter, and active user interaction with a handler; the published assessment reports no direct vulnerable-system or subsequent-system impact.
The record
- CVE
- CVE-2026-32732
- Published
- Mar 13, 2026
- Updated
- Mar 13, 2026
- Vendor
- Lean FRO
- Product
- Lean 4 VS Code Extension
- Classifications
- CWE-80, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 13, 2026CVE publishedPublication date reported by the CVE source.
- Mar 13, 2026Record 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=< 0.2.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
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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