HOMEVULNERABILITIESCVE-2026-39866
HIGH

CVE-2026-39866

CWE-77Published: April 21, 2026· Updated: Apr 23, 2026

8.8
CVSS v3.1
EPSS:0.29%probability of exploitation in 30 daysPercentile:52.8th

Official 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.

NVD Source

Technical Analysis

CVE-2026-39866 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

lawnchair1 product
lawnchair
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

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

All References (3)

→
https://github.com/LawnchairLauncher/lawnchair/commit/fcba413f55dd47f8a3921445252849126c6266b2Patch
→
https://github.com/LawnchairLauncher/lawnchair/security/advisories/GHSA-9prc-pp2c-3427Exploit · Vendor Advisory
→
https://github.com/LawnchairLauncher/lawnchair/security/advisories/GHSA-9prc-pp2c-3427Exploit · Vendor Advisory

Quick Facts

CVE IDCVE-2026-39866
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-77
CISA KEVNo
EPSS (30d)0.29%
Affected1 vendor
PublishedApr 21, 2026

Related CVEs (CWE-77)

CVE-2025-15379
10.0
CVE-2026-45663
9.9
CVE-2026-52806
KEV9.9
CVE-2026-20186
9.9
CVE-2026-20147
9.9
CVE-2026-26068
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-39866 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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