Authentication bypass by spoofing in KDE Connect protocol
Priority LOW 21CWE-290Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-290.
Summary
The KDE Connect protocol 8 before 2025-11-28 does not correlate device IDs across two packets. This affects KDE Connect before 25.12 on desktop, KDE Connect before 0.5.4 on iOS, KDE Connect before 1.34.4 on Android, GSConnect before 68, and Valent before 1.0.0.alpha.49.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00215 11th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-66270
- 2026-10-03 Alias added: GHSA-xcg9-fw4f-9chv
References
Other 6
- https://invent.kde.org/network/kdeconnect-kde/-/commit/4e53bcdd5d4c28bd9fefd114b807ce35d7b3373e
- https://invent.kde.org/network/kdeconnect-android/-/commit/675d2d24a1eb95d15d9e5bde2b7e2271d5ada6a9
- https://invent.kde.org/network/kdeconnect-ios/-/commit/6c003c22d04270cabc4b262d399c753d55cf9080
- https://github.com/GSConnect/gnome-shell-extension-gsconnect/commit/a38246deec0af50ae218cdc51db32cdd7eb145e3
- https://github.com/andyholmes/valent/commit/85f773124a67ed1add79e7465bb088ec667cccce
- https://kde.org/info/security/advisory-20251128-1.txt
More KDE vulnerabilities
- TI-2026-73452 OS command injection in KDE Dolphin via crafted folder names CVSS 4.0HIGH 7.1
- TI-2004-00806 Multiple integer overflows in xpdf 2.0 and 3.0, and other packages that use xpdf code… CVSS 2.0HIGH 10.0
- TI-2012-03853 Type confusion in KDE Konqueror CVSS 3.1HIGH 8.8
- TI-2004-00807 Multiple integer overflows in xpdf 3.0, and other packages that use xpdf code such as… CVSS 2.0HIGH 10.0
- TI-2005-00011 Multiple vulnerabilities in fliccd, when installed setuid root as part of the kdeedu… CVSS 2.0HIGH 10.0
- TI-2004-01022 Buffer overflow in the Gfx::doImage function in Gfx.cc for xpdf 3.00, and other products… CVSS 2.0HIGH 9.3
Sources
- CVE-2025-66270 · CVE Program
- CVE-2025-66270 · NVD
- FIRST EPSS
- GHSA-xcg9-fw4f-9chv · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences