Description
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.
References (3)
Core 3
Core References
Vendor Advisory x_refsource_confirm
https://github.com/leanprover/vscode-lean4/security/advisories/GHSA-6ggm-pwr9-r5h2
Issue Tracking x_refsource_misc
https://github.com/leanprover/vscode-lean4/pull/735
Various Sources x_refsource_misc
https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/weird.20behavior.20in.20loogle.20searchbar/near/578502003
Scores
CVSS v4
0.0
EPSS
0.0033
EPSS Percentile
24.3%
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
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-80
Status
published
Products (1)
leanprover/vscode-lean4
< 0.2.0
Published
Mar 16, 2026
Tracked Since
Mar 16, 2026