CVE-2026-39866

Description

Lawnchair is a free, open-source home app for Android. Prior to commit fcba413f55dd47f8a3921445252849126c6266b2, command injection in release_update.yml workflow dispatch input allows arbitrary code execution. Commit fcba413f55dd47f8a3921445252849126c6266b2 patches the issue.

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CVSS v3.1 Score

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0018

Probability of exploitation

0.39%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-77 CWE-77

Affected Products

Vendor	Product	Versions
lawnchair	lawnchair	< 15.0.0

References

Advisories & Patches

https://github.com/LawnchairLauncher/lawnchair/commit/fcba413f55dd47f8a3921445252849126c6266b2 https://github.com/LawnchairLauncher/lawnchair/security/advisories/GHSA-9prc-pp2c-3427 https://github.com/LawnchairLauncher/lawnchair/security/advisories/GHSA-9prc-pp2c-3427

Exploits

https://github.com/LawnchairLauncher/lawnchair/security/advisories/GHSA-9prc-pp2c-3427 https://github.com/LawnchairLauncher/lawnchair/security/advisories/GHSA-9prc-pp2c-3427

Frequently Asked Questions

What is CVE-2026-39866? +

Lawnchair is a free, open-source home app for Android. Prior to commit fcba413f55dd47f8a3921445252849126c6266b2, command injection in release_update.yml workflow dispatch input allows arbitrary code execution. Commit fcba413f55dd47f8a3921445252849126c6266b2 patches the issue. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-39866? +

CVE-2026-39866 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0018, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-39866? +

CVE-2026-39866 affects products from lawnchair, specifically: lawnchair. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-39866? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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