EUVD-2026-78673
GHSA-hmj5-jm8h-h9fh
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Network-accessible unauthenticated endpoint; user click required; scope change reflects cross-domain redirect; only indirect confidentiality and integrity impact via phishing, no availability impact.
Primary rating from Vendor (https://github.com/kiwitcms/Kiwi).
CVSS VectorVendor: https://github.com/kiwitcms/Kiwi
Lifecycle Timeline
2DescriptionCVE.org
Summary
An open redirect vulnerability in the account confirmation endpoint allows an unauthenticated attacker to craft a URL hosted on a legitimate Kiwi TCMS instance that redirects victims to an arbitrary external domain. The attack surface is particularly relevant for phishing campaigns targeting Kiwi TCMS users, as the malicious link originates from a trusted organizational hostname.
Impact
This is an open redirect vulnerability (CWE-601). Any unauthenticated attacker can exploit it against any user of a Kiwi TCMS deployment.
The primary risk is phishing. Because Kiwi TCMS is typically deployed as an internal tool for engineering and QA teams, a redirect from the organization's own hostname carries high implicit trust. An attacker can use this endpoint to:
- Redirect victims to a credential-harvesting page styled to match the Kiwi TCMS or corporate SSO login.
- Bypass email security filters and link-reputation checks that allowlist the organization's domain.
- Distribute malware via a convincing "confirm your account" lure.
AnalysisAI
Open redirect in Kiwi TCMS's account confirmation endpoint allows unauthenticated remote attackers to craft URLs hosted on a legitimate organizational Kiwi TCMS instance that silently redirect victims to arbitrary external domains. All deployments running versions prior to v16.1 are affected, with no authentication required from the attacker - only a victim click. The primary threat is high-trust phishing: because the malicious link originates from the organization's own hostname, it bypasses email security filters and link-reputation checks, enabling convincing credential-harvesting or malware delivery campaigns targeting engineering and QA staff. No active exploitation is confirmed (not in CISA KEV), and no public exploit code has been identified at time of analysis.
Technical ContextAI
Kiwi TCMS is a Django-based open-source test case management system distributed via PyPI (CPE: pkg:pip/kiwitcms). The vulnerability is a CWE-601 (URL Redirection to Untrusted Site) flaw in the account confirmation endpoint, where a redirect target URL parameter is accepted without validation or allowlisting of permissible destinations. Django applications commonly implement post-confirmation redirects via query parameters (e.g., ?next=) that, if unsanitized, allow any absolute URL - including external ones - to be injected. The CVSS scope change (S:C) reflects that the impact crosses a trust boundary: a request handled by the Kiwi TCMS server ultimately delivers the victim's browser to an attacker-controlled domain, affecting a system component outside the vulnerable application's authorization scope.
RemediationAI
The primary fix is to upgrade Kiwi TCMS to v16.1 or later via pip (pip install --upgrade kiwitcms); this is the vendor-released patch confirmed by the GitHub release tag at https://github.com/kiwitcms/Kiwi/releases/tag/v16.1 and the advisory at https://github.com/kiwitcms/Kiwi/security/advisories/GHSA-hmj5-jm8h-h9fh. If immediate upgrade is not possible, restrict access to the account confirmation endpoint at the network perimeter or reverse proxy layer to limit exposure to trusted internal networks only - this reduces the phishing attack surface by preventing external actors from crafting externally deliverable redirect URLs, though it does not eliminate the vulnerability for insider-threat or already-networked attacker scenarios. Additionally, operators can configure email security gateways to flag or quarantine messages containing links to the Kiwi TCMS instance's confirmation endpoint path as a temporary compensating control.
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