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.

STIX identifiervulnerability--85c689f7-57ff-56b1-bffa-f85f8017c8e1

First observation-

Last observation-

Known relationships10

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 analysis

Presence in OpenCTI describes an intelligence correlation and does not, by itself, constitute evidence of compromise, legal attribution or operational guidance applicable without context verification.