CVE-2026-100523
mediumCotonti through 1.0.0 contains an open redirect vulnerability in message.php that base64-decodes the redirect parameter without domain validation.
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.
CVSS
6.1
6.1 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Severity source: NVD CVSS v3.1 (disclosure@vulncheck.com)
Timeline (UTC)
Published: 2026-09-26 01:17
Modified: 2026-10-05 15:17
NVD status: Deferred
Last synced 3 days ago
Verified against the source API 2026-10-27 06:56 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/Cotonti/Cotonti disclosure@vulncheck.com
- https://github.com/Cotonti/Cotonti/blob/1.0.0/message.php disclosure@vulncheck.com
- https://github.com/Cotonti/Cotonti/blob/1.0.0/system/common.php disclosure@vulncheck.com
- https://github.com/Cotonti/Cotonti/issues/1907 disclosure@vulncheck.com
- https://github.com/Cotonti/Cotonti/pull/1908 disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/cotonti-through-1.0.0-open-redirect-via-message-php-r... disclosure@vulncheck.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:56 UTC · record ↗