EUVD-2026-38018
GHSA-2pmh-ppc3-5j39
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network delivery with no required privileges, but user must click a crafted link; scope changes to victim browser/identity layer with low confidentiality and integrity impact from credential theft.
Primary rating from Vendor (apache).
CVSS VectorVendor: apache
Lifecycle Timeline
1DescriptionCVE.org
URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Apache APISIX.
The default configuration of cas-auth in Apache APISIX is vulnerable to phishing and credential theft.
This issue affects Apache APISIX: from 3.0.0 through 3.16.0.
Users are recommended to upgrade to version 3.17.0, which fixes the issue.
AnalysisAI
Open redirect in Apache APISIX's cas-auth plugin exposes users to phishing and credential theft when the plugin is used in its default configuration. Affected are all APISIX deployments running versions 3.0.0 through 3.16.0 with cas-auth enabled. An unauthenticated remote attacker can craft a malicious CAS authentication URL that redirects victims to an attacker-controlled site, enabling session hijacking or credential harvesting. No public exploit or KEV listing is recorded at time of analysis, and the CVSS 4.0 base score of 2.1 reflects the attacker's dependence on user interaction and the absence of direct system-level impact.
Technical ContextAI
Apache APISIX is an open-source, cloud-native API gateway. Its cas-auth plugin implements the CAS (Central Authentication Service) protocol for single sign-on flows. CWE-601 (URL Redirection to Untrusted Site) describes a class of vulnerability where an application accepts user-supplied or insufficiently validated redirect URLs and forwards the browser to an attacker-chosen destination after authentication. In APISIX's cas-auth, the default configuration fails to validate or restrict the post-authentication redirect target, allowing an attacker to inject an arbitrary URL into the CAS callback flow. The CPE cpe:2.3:a:apache_software_foundation:apache_apisix:*:*:*:*:*:*:*:* covers all versions in the 3.0.0-3.16.0 range. The CVSS 4.0 vector AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N confirms network delivery, no privilege requirement, but mandates active user interaction (UI:A) and notes subsequent-system confidentiality and integrity impacts (SC:L/SI:L), consistent with credential theft on the victim's browser/identity layer rather than server compromise.
RemediationAI
The primary fix is upgrading Apache APISIX to version 3.17.0, which resolves the open redirect in cas-auth's default configuration per the vendor advisory at https://lists.apache.org/thread/2syk2kkzjnpzrdh98plbzj8os7wn521c. If immediate upgrade is not feasible, operators should consider disabling the cas-auth plugin entirely on routes where it is not strictly required, which eliminates the attack surface with no functional trade-off for those routes. Alternatively, deploying a WAF or reverse proxy rule to reject requests where the CAS redirect parameter contains off-domain hostnames can serve as a compensating control, though this requires careful tuning to avoid breaking legitimate CAS flows. Operators should also audit any allowlist or redirect URI configuration in the CAS server itself to restrict permitted return URLs to known-good APISIX endpoints, which would independently block exploitation even if the APISIX-side flaw is present.
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