CVE-2026-100523

MEDIUM 6.1

Cotonti through 1.0.0 Open Redirect via message.php redirect parameter

CVSS Score

6.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-601
Vendor	cotonti
Product	cotonti
Published	Sep 26, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

Cotonti / Cotonti

0 ≤ 1.0.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/Cotonti/Cotonti/issues/1907 github.com: https://github.com/Cotonti/Cotonti/pull/1908 github.com: https://github.com/Cotonti/Cotonti/blob/1.0.0/message.php github.com: https://github.com/Cotonti/Cotonti/blob/1.0.0/system/common.php github.com: https://github.com/Cotonti/Cotonti vulncheck.com: https://www.vulncheck.com/advisories/cotonti-through-1.0.0-open-redirect-via-message-php-redirect-parameter

Credits

Harsh Raj Singhania