CVE-2026-100523
Cotonti through 1.0.0 Open Redirect via message.php redirect parameter
Cotonti Cotonti
CVSS
5.1MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.19%Chance of exploitation activity in the next 30 days, higher than 7% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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.
Text from CVE List
Affected versions 1
- Cotontiaffected: all versions through 1.0.0CVE List
References 6
- github.com/Cotonti/Cotonti/pull/1908Fixvia CVE List
- vulncheck.com/advisories/cotonti-through-1.0.0-open-redirect-via-message-php-redirect-parameterAdvisoryvia CVE List
- github.com/Cotonti/Cotonti/issues/1907Referencevia CVE List
- github.com/Cotonti/Cotonti/blob/1.0.0/message.phpReferencevia CVE List
- github.com/Cotonti/Cotonti/blob/1.0.0/system/common.phpReferencevia CVE List
- github.com/Cotonti/CotontiReferencevia CVE List