CVE-2026-5266: CWE-200 Exposure of Sensitive Information to an Unauthorized Actor in Wikimedia Foundation Echo
CVE-2026-5266 is a low-severity vulnerability in the Wikimedia Foundation's Echo notification system that allows exposure of sensitive information to unauthorized actors. It affects Echo versions before 1. 43. 7, 1. 44. 4, and 1. 45. 2. The issue is related to the ApiEchoNotifications. php file.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-5266) in Wikimedia Foundation Echo involves exposure of sensitive information due to improper access controls or information handling in the ApiEchoNotifications.php component. It affects multiple versions of Echo prior to 1.43.7, 1.44.4, and 1.45.2. The CVSS 4.0 vector indicates network attack vector, low complexity, partial privileges required, no user interaction, and low impact on confidentiality. No official remediation level or patch is currently documented.
Potential Impact
The vulnerability allows unauthorized actors to access sensitive information within the Echo notification system. Given the low CVSS score (2.3) and lack of known exploits, the impact is limited but could potentially lead to information disclosure within affected Wikimedia Foundation Echo deployments.
Mitigation Recommendations
Patch status is not yet confirmed — check the Wikimedia Foundation vendor advisory for current remediation guidance. Until an official fix is released, limit exposure by restricting access to the Echo notification system and monitoring for unusual access patterns. No official patch or temporary fix is currently documented.
CVE-2026-5266: CWE-200 Exposure of Sensitive Information to an Unauthorized Actor in Wikimedia Foundation Echo
Description
CVE-2026-5266 is a low-severity vulnerability in the Wikimedia Foundation's Echo notification system that allows exposure of sensitive information to unauthorized actors. It affects Echo versions before 1. 43. 7, 1. 44. 4, and 1. 45. 2. The issue is related to the ApiEchoNotifications. php file.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-5266) in Wikimedia Foundation Echo involves exposure of sensitive information due to improper access controls or information handling in the ApiEchoNotifications.php component. It affects multiple versions of Echo prior to 1.43.7, 1.44.4, and 1.45.2. The CVSS 4.0 vector indicates network attack vector, low complexity, partial privileges required, no user interaction, and low impact on confidentiality. No official remediation level or patch is currently documented.
Potential Impact
The vulnerability allows unauthorized actors to access sensitive information within the Echo notification system. Given the low CVSS score (2.3) and lack of known exploits, the impact is limited but could potentially lead to information disclosure within affected Wikimedia Foundation Echo deployments.
Mitigation Recommendations
Patch status is not yet confirmed — check the Wikimedia Foundation vendor advisory for current remediation guidance. Until an official fix is released, limit exposure by restricting access to the Echo notification system and monitoring for unusual access patterns. No official patch or temporary fix is currently documented.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- wikimedia-foundation
- Date Reserved
- 2026-03-31T18:45:42.439Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a021045cbff5d86103d46c8
Added to database: 5/11/2026, 5:22:13 PM
Last enriched: 5/11/2026, 5:37:03 PM
Last updated: 5/11/2026, 6:36:33 PM
Views: 4
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.