CVE-2026-100523CWE-601

CVE-2026-100523

Medium · published September 26, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
7.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
5.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
EPSS
0.00188 · 7.9th percentile
Weakness
CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
Published
2026-09-26T05:17Z
References (6)
https://github.com/Cotonti/Cotonti · [email protected]https://github.com/Cotonti/Cotonti/blob/1.0.0/message.php · [email protected]https://github.com/Cotonti/Cotonti/blob/1.0.0/system/common.php · [email protected]https://github.com/Cotonti/Cotonti/issues/1907 · [email protected]https://github.com/Cotonti/Cotonti/pull/1908 · [email protected]https://www.vulncheck.com/advisories/cotonti-through-1.0.0-open-redirect-via-message-php-redirect-parameter · [email protected]
EPSS history
Timeline
  • 27 SEP 03:24Z
    EPSS moved — → 0%
    epss
  • 26 SEP 00:59Z
    Cotonti through 1.0.0 Open Redirect via message.php redirect parameter
    cvelistv5