Vulnerability
CVE-2026-100523
Descriptive record received from OpenCTI and minimised for consultation in the Intel portal.
- Sharing
- PUBLIC-OSINT
- Confidence
- 100
- Source
- The CVE Program
- Updated
- 26/09/2026 08:15
Description
Cotonti through 1.0.0 contains an open redirect vulnerability in message.php that base64-decodes the redirect parameter without domain validation. Unauthenticated attackers can craft malicious links with encoded external URLs to redirect users to arbitrary sites via meta refresh tags for phishing attacks.
Aliases and classifications
CWE-601URL Redirection to Untrusted Site ('Open Redirect')
Minimised technical details
No raw data- cisa kev
- False
- cvss score
- 6.1
- cvss vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- cvss severity
- MEDIUM
Provenance
Public references
- technical-description
https://github.com/Cotonti/Cotonti/blob/1.0.0/message.php - issue-tracking
https://github.com/Cotonti/Cotonti/pull/1908 - technical-description
https://github.com/Cotonti/Cotonti/blob/1.0.0/system/common.php - issue-tracking
https://github.com/Cotonti/Cotonti/issues/1907 - VulnCheck Advisory: Cotonti through 1.0.0 Open Redirect via message.php redirect parameter
https://www.vulncheck.com/advisories/cotonti-through-1.0.0-open-redirect-via-message-php-redirect-parameter - third-party-advisory
https://github.com/Cotonti/Cotonti
EudorIA correlation
Intel catalogue
The vulnerability is also available in the EudorIA editorial catalogue.
Open EudorIA analysisPresence in OpenCTI describes an intelligence correlation and does not, by itself, constitute evidence of compromise, legal attribution or operational guidance applicable without context verification.