CVE-2026-32732
XSS in @leanprover/unicode-input-component
Lean 4 VS Code Extension is a Visual Studio Code extension for the Lean 4 proof assistant. Projects that use @leanprover/unicode-input-component are vulnerable to an XSS exploit in 0.1.9 of the package and lower. The component re-inserted text in the input element back into the input element as unescaped HTML. The issue has been resolved in 0.2.0.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Active
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
XSS in @leanprover/unicode-input-component
Lean 4 VS Code Extension is a Visual Studio Code extension for the Lean 4 proof assistant. Projects that use @leanprover/unicode-input-component are vulnerable to an XSS exploit in 0.1.9 of the package and lower. The component re-inserted text in the input element back into the input element as unescaped HTML. The issue has been resolved in 0.2.0.
- Record
CVE-2026-32732- CVSS 4.0
- 0.0 None
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-80
- Updated
- 2026-11-02
EUVDEUVD-2026-12181 No score
Lean 4 VS Code Extension is a Visual Studio Code extension for the Lean 4 proof assistant. Projects that use @leanprover/unicode-input-component are vulnerable to an XSS exploit in 0.1.9 of the package and lower. The component re-inserted text in the input element back into the input element as unescaped HTML. The issue has been resolved in 0.2.0.
- Record
EUVD-2026-12181- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-6ggm-pwr9-r5h2
XSS in @leanprover/unicode-input-component
Impact
Projects that use @leanprover/unicode-input-component are vulnerable to an XSS exploit in 0.1.9 of the package and lower. The component re-inserted text in the input element back into the input element as unescaped HTML.
Patches
The issue has been resolved in 0.2.0.
Workarounds
Replace the unicode input component with a basic HTML text field.
- Record
GHSA-6ggm-pwr9-r5h2- CVSS 4.0
- 0.0 None
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-80
- Updated
- 2026-11-02
NVD
Lean 4 VS Code Extension is a Visual Studio Code extension for the Lean 4 proof assistant. Projects that use @leanprover/unicode-input-component are vulnerable to an XSS exploit in 0.1.9 of the package and lower. The component re-inserted text in the input element back into the input element as unescaped HTML. The issue has been resolved in 0.2.0.
- Record
CVE-2026-32732- CVSS 4.0
- 0.0 None
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Weakness
- CWE-80
- Updated
- 2026-11-02
OSVGHSA-6ggm-pwr9-r5h2
XSS in @leanprover/unicode-input-component
Impact
Projects that use @leanprover/unicode-input-component are vulnerable to an XSS exploit in 0.1.9 of the package and lower. The component re-inserted text in the input element back into the input element as unescaped HTML.
Patches
The issue has been resolved in 0.2.0.
Workarounds
Replace the unicode input component with a basic HTML text field.
- Record
GHSA-6ggm-pwr9-r5h2- CVSS 4.0
- 0.0 None
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-80
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
@leanprover/unicode-input-componentnpm |
before 0.2.0 | 0.2.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-32732 is a none vulnerability (CVSS 0.0) in Leanprover Vscode-lean4, published March 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.32%, the 24th percentile. Fixed in @leanprover/unicode-input-component 0.2.0.