CVE-2026-103446
WikiLambda exposes anonymous execution of unsaved Abstract Wikipedia fragments
Authorization bypass through User-Controlled key vulnerability in The Wikimedia Foundation MediaWiki WikiLambda extension allows Authentication Bypass.
This issue affects MediaWiki WikiLambda extension: 1.46.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- Passive
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
WikiLambda exposes anonymous execution of unsaved Abstract Wikipedia fragments
Authorization bypass through User-Controlled key vulnerability in The Wikimedia Foundation MediaWiki WikiLambda extension allows Authentication Bypass.
This issue affects MediaWiki WikiLambda extension: 1.46.
- Record
CVE-2026-103446- CVSS 4.0
- 7.4 High
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/S:N/AU:Y/R:U/V:C/RE:M/U:Amber - Weakness
- CWE-639
- Updated
- 2026-11-02
EUVDEUVD-2026-90199
Authorization bypass through User-Controlled key vulnerability in The Wikimedia Foundation MediaWiki WikiLambda extension allows Authentication Bypass.
This issue affects MediaWiki WikiLambda extension: 1.46.
- Record
EUVD-2026-90199- CVSS 4.0
- 7.4 High
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/S:N/AU:Y/R:U/V:C/RE:M/U:Amber - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-4x94-p99h-wrcj
Authorization bypass through User-Controlled key vulnerability in The Wikimedia Foundation...
Authorization bypass through User-Controlled key vulnerability in The Wikimedia Foundation MediaWiki WikiLambda extension allows Authentication Bypass.
This issue affects MediaWiki WikiLambda extension: 1.46.
- Record
GHSA-4x94-p99h-wrcj- CVSS 4.0
- 7.4 High
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/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:N/AU:Y/R:U/V:C/RE:M/U:Amber - Weakness
- CWE-639
- Updated
- 2026-11-02
NVD
Authorization bypass through User-Controlled key vulnerability in The Wikimedia Foundation MediaWiki WikiLambda extension allows Authentication Bypass.
This issue affects MediaWiki WikiLambda extension: 1.46.
- Record
CVE-2026-103446- CVSS 4.0
- 7.4 High
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/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:N/AU:Y/R:U/V:C/RE:M/U:Amber - Weakness
- CWE-639
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | BomboBombone/CVE-2026-103446 | 2026-09-30 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-103446 is a high vulnerability (CVSS 7.4) in The Wikimedia Foundation Mediawiki Wikilambda Extension, published September 30, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.33%, the 26th percentile. No source names a fixed version.