CVE-2026-93869: medium-severity vulnerability in Cotonti
Cotonti through 1.0.0 Open Redirect via Unanchored cot_url_check() Regex
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.4%
Cotonti through 1.0.0 contains an open redirect vulnerability in the cot_url_check() function that validates redirect destinations using a regular expression lacking an end-of-string anchor. Attackers can bypass the redirect guard by supplying hostnames beginning with the site domain to redirect users to attacker-controlled hosts through the ratings plugin or other redirect callers.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Affected products
Cotonti · CotontiRelated CVEs — Cotonti
In the same product, most dangerous first.
CVE-2026-91939CRITICALCotonti 1.0.0 Comments Plugin PHP Object Injection via ci ParameterEPSS 1.0%CVE-2026-93868CRITICALCotonti through 1.0.0 Predictable Password Recovery Token via Weak PRNGEPSS 0.7%CVE-2026-93872HIGHCotonti 1.0.0 PHP Object Injection via Comments Plugin Edit Action cb ParameterEPSS 0.7%CVE-2026-71294HIGHCotonti CMS Comments Plugin PHP Object Injection via Unrestricted unserialize() in Create/Edit ActionsEPSS 0.4%CVE-2026-93871MEDIUMCotonti through 1.0.0 Stored Open Redirect via Page redir: PrefixEPSS 0.3%CVE-2026-58143HIGHCotonti Siena 0.9.26 CSRF via admin.php Config Update EndpointEPSS 0.2%
References
https://github.com/Cotonti/Cotontihttps://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/ratings/ratings.ajax.phphttps://github.com/Cotonti/Cotonti/blob/1.0.0/system/functions.phphttps://github.com/Cotonti/Cotonti/issues/1891https://github.com/Cotonti/Cotonti/pull/1899https://www.vulncheck.com/advisories/cotonti-through-1.0.0-open-redirect-via-unanchored-cot-url-check-regex