VulnerabilityPublished 9 Nov 2026

CVE-2026-77433: Kiwitcms · Kiwi TCMS account confirmation open redirect through protocol-relative URLs

Affects kiwitcmsSource GCVE Database

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Not known to be exploited · CVSS 6.1 Medium · fixed in 16.2 : update kiwitcms when convenient.

Data as of 10 Nov 2026, 00:37 UTC

CVSS 3.1 base score

6.1Medium

How severe the flaw is on the 0–10 CVSS scale.

Patch: Available – fixed in 16.2

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Changed
Confidentiality: Low
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 9 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
PyPIkiwitcms	Affected <=12.4	Fixed in–

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AI-suggested

Upgrade Kiwi TCMS to version 16.2 or later, where the vulnerability is fixed by using Django's url_has_allowed_host_and_scheme utility for proper URL validation. If upgrading is not immediately possible, avoid using untrusted 'next' parameters in account confirmation links or implement equivalent URL validation to reject protocol-relative and external URLs.

Description

Kiwi TCMS version 16.1 contains an incomplete fix for an open redirect vulnerability in the account confirmation endpoint. The vulnerability allows an attacker to craft a confirmation link that redirects users to an external, attacker-controlled domain using protocol-relative URLs (e.g., //evil.com). This can facilitate phishing, malware delivery, or social engineering attacks by exploiting user trust in the legitimate Kiwi TCMS instance. The issue is fixed in version 16.2 by properly validating redirect URLs using Django's url_has_allowed_host_and_scheme utility.

Impact

An attacker can exploit this vulnerability to redirect users to attacker-controlled domains after they confirm their account. This can be used for credential phishing, malware delivery, or social engineering attacks leveraging the trust in the legitimate Kiwi TCMS domain. The attack requires sending a malicious activation link to a user or intercepting/predicting the activation key. The vulnerability allows partial compromise of user trust and confidentiality but does not directly impact system availability.

Summary

The vulnerability (CVE-2026-77433) in Kiwi TCMS arises from improper validation of the 'next' parameter in the account confirmation endpoint. The existing check uses url.startswith("/"), which incorrectly allows protocol-relative URLs starting with '//' to pass validation. Browsers interpret these as external URLs, enabling open redirect attacks. An attacker can send a crafted activation link that redirects users to malicious sites after account confirmation. The recommended fix replaces the naive check with Django's url_has_allowed_host_and_scheme function, which correctly validates URLs against allowed hosts and schemes. This vulnerability affects versions up to 12.4 and is fixed in version 16.2.

CWE-601URL Redirection to Untrusted Site (Open Redirect) (opens in a new tab)
Base weaknessLikelihood of exploit: LowOWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
Architecture and Design
Use an intermediate disclaimer page that provides the user with a clear warning that they are leaving the current site. Implement a long timeout before the redirect occurs, or force the user to click on the link. Be careful to avoid XSS problems (CWE-79) when generating the disclaimer page.
Architecture and Design · Enforcement by Conversion
When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
OWASP Cheat Sheets
Mass Assignment (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V5.1.5 (opens in a new tab)
Attack patterns
Cross-Site Flashing (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 10 Nov 2026, 00:37 UTC

WeaknessesCWE-601

Technical details

References

Community reviews

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