========================================================================= OSSA-2026-009: Unauthenticated session flood via login redirect storage =========================================================================
:Date: April 27, 2026 :CVE: CVE-2026-43002
Affects ~~~~~~~ - Horizon: >=25.6.0 <25.7.3
Description ~~~~~~~~~~~ Erichen (Institute of Computing Technology, Chinese Academy of Sciences) reported a denial of service vulnerability in Horizon. The login view stores a post-login redirect URL in the server-side session before the user authenticates. Because each unauthenticated request without a session cookie triggers a new persistent session entry, an attacker can exhaust the session storage backend (Memcached, Redis, or database) by sending repeated requests to /auth/login/?next=URL. When the backend reaches capacity, legitimate sessions are evicted, logging out administrators and preventing them from accessing the dashboard. This is a regression of CVE-2014-8124. Deployments running Horizon from the 2026.1 (Gazpacho) release series with default session configuration are affected. Earlier release series do not contain the vulnerable code.
Patches ~~~~~~~ - https://review.opendev.org/c/openstack/horizon/+/986834 (2026.1/gazpacho)
Credits ~~~~~~~ References ~~~~~~~~~~ - https://launchpad.net/bugs/2150331 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-43002
Notes ~~~~~ - This vulnerability was introduced in commit 3e2ff4e06 (Horizon 25.6.0) and only affects the 2026.1 (Gazpacho) release series. Earlier releases are not affected. - This is a regression of CVE-2014-8124. The original middleware-level fix remains effective, but the new view-layer session write bypasses it.
-- Goutham Pacha Ravi (gouthamr) OpenStack Vulnerability Management Team https://security.openstack.org/vmt.html
An issue was discovered in OpenStack Horizon 25.6 and 25.7 before 25.7.3. There is a write operation to the session storage backend before authentication and thus storage can be exhausted by unauthenticated requests. This is a regression of the CVE-2014-8124 fix.
Open Redirect vulnerability in Horizon Web Dashboard 19.4.0 thru 20.1.4 via the successurl parameter.
A vulnerability was found in yanheven console and classified as problematic. Affected by this issue is some unknown functionality of the file horizon/static/horizon/js/horizon.instances.js. The manipulation leads to cross site scripting. The attack may be launched remotely. The patch is identified as 32a7b713468161282f2ea01d5e2faff980d924cd. It is recommended to apply a patch to fix this issue. VDB-218354 is the identifier assigned to this vulnerability.
An issue was discovered in OpenStack Horizon before 15.3.2, 16.x before 16.2.1, 17.x and 18.x before 18.3.3, 18.4.x, and 18.5.x. There is a lack of validation of the "next" parameter, which would allow someone to supply a malicious URL in Horizon that can cause an automatic redirect to the provided malicious URL.
The file /etc/openstack-dashboard/localsettings within Red Hat OpenStack Platform 2.0 and RHOS Essex Release (python-django-horizon package before 2012.1.1) is world readable and exposes the secret key value.
Within the RHOS Essex Preview (2012.2) of the OpenStack dashboard package, the file /etc/quantum/quantum.conf is world readable which exposes the admin password and token value.
OpenStack Horizon allows remote authenticated administrators to conduct XSS attacks via a crafted federation mapping.
Upstream bug:
https://bugs.launchpad.net/horizon/+bug/1667086
OpenStack Horizon 9.x through 9.1.1, 10.x through 10.0.2, and 11.0.0 allows remote authenticated administrators to conduct XSS attacks via a crafted federation mapping.
Beth Lancaster and Brandon Sawyers from Virginia Tech reported a vulnerability in Horizon. By injecting Angularjs template in dashboard forms, such as image's description, an authenticated user may trigger a cross-site-scripting vulnerability when another user browses the affected pages. It may result in potential assets theft like user access credentials. All Horizon setups are affected.
Cross-site scripting (XSS) vulnerability in the Orchestration/Stack section in OpenStack Dashboard (Horizon) 2014.2 before 2014.2.4 and 2015.1.x before 2015.1.1 allows remote attackers to inject arbitrary web script or HTML via the description parameter in a heat template, which is not properly handled in the helptext attribute in the Field class.
Multiple cross-site scripting (XSS) vulnerabilities in OpenStack Dashboard (Horizon) 2015.1.0 allow remote authenticated users to inject arbitrary web script or HTML via the metadata to a (1) Glance image, (2) Nova flavor or (3) Host Aggregate.
OpenStack Dashboard (Horizon) before 2014.1.3 and 2014.2.x before 2014.2.1 does not properly handle session records when using a db or memcached session engine, which allows remote attackers to cause a denial of service via a large number of requests to the login page.
Cross-site scripting (XSS) vulnerability in horizon/static/horizon/js/horizon.instances.js in the Launch Instance menu in OpenStack Dashboard (Horizon) before 2013.2.4, 2014.1 before 2014.1.2, and Juno before Juno-2 allows remote authenticated users to inject arbitrary web script or HTML via a network name.
Cross-site scripting (XSS) vulnerability in the Groups panel in OpenStack Dashboard (Horizon) before 2013.2.4, 2014.1 before 2014.1.2, and Juno before Juno-2 allows remote administrators to inject arbitrary web script or HTML via a user email address, a different vulnerability than CVE-2014-3475.
Cross-site scripting (XSS) vulnerability in the Users panel (admin/users/) in OpenStack Dashboard (Horizon) before 2013.2.4, 2014.1 before 2014.1.2, and Juno before Juno-2 allows remote administrators to inject arbitrary web script or HTML via a user email address, a different vulnerability than CVE-2014-8578.
Title: Persistent XSS in Horizon Host Aggregates interface Reporters: Dennis Felsch and Mario Heiderich (Ruhr-University Bochum) Products: Horizon Versions: up to 2013.2.3, and 2014.1 versions up to 2014.1.2
Description: Dennis Felsch and Mario Heiderich from the Horst Görtz Institute for IT-Security, Ruhr-University Bochum reported a persistent XSS in Horizon. A malicious administrator may conduct a persistent XSS attack by registering a malicious host aggregate in Horizon Host Aggregate interface. Once executed in a legitimate context this attack may reveal another admin token, potentially resulting in a lateral privilege escalation. All Horizon setups are affected.
Acknowledgements:
Red Hat would like to thank the OpenStack project for reporting this issue. Upstream acknowledges Dennis Felsch and Mario Heiderich from the Horst Görtz Institute for IT-Security, Ruhr-University Bochum as the original reporters.
Cross-site scripting (XSS) vulnerability in the Host Aggregates interface in OpenStack Dashboard (Horizon) before 2013.2.4, 2014.1 before 2014.1.2, and Juno before Juno-3 allows remote administrators to inject arbitrary web script or HTML via a new host aggregate name.
Cross-site scripting (XSS) vulnerability in the Orchestration/Stack section in the Horizon Orchestration dashboard in OpenStack Dashboard (Horizon) before 2013.2.4, 2014.1 before 2014.1.2, and Juno before Juno-2, when used with Heat, allows remote Orchestration template owners or catalogs to inject arbitrary web script or HTML via a crafted template.
The Identity v3 API in OpenStack Dashboard (Horizon) before 2013.2 does not require the current password when changing passwords for user accounts, which makes it easier for remote attackers to change a user password by leveraging the authentication token for that user.
It was reported that, if an Horizon user were tricked into using a malicious template in the Orchestration/Stack section of Horizon, it would be possible for an attacker to conduct cross-site scripting (XSS) attacks.
The original report notes "2013.2.1 version up to 2013.2.2" are affected.
Acknowledgements:
Red Hat would like to thank the OpenStack project for reporting this issue. Upstream acknowledges Cristian Fiorentino from Intel as the original reporter.
Cross-site scripting (XSS) vulnerability in the Horizon Orchestration dashboard in OpenStack Dashboard (aka Horizon) 2013.2 before 2013.2.4 and icehouse before icehouse-rc2 allows remote attackers to inject arbitrary web script or HTML via the description field of a Heat template.
Multiple cross-site scripting (XSS) vulnerabilities in OpenStack Dashboard (Horizon) 2013.2 and earlier allow local users to inject arbitrary web script or HTML via an instance name to (1) "Volumes" or (2) "Network Topology" page.
Open redirect vulnerability in views/authforms.py in OpenStack Dashboard (Horizon) Essex (2012.1) allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a URL in the next parameter to auth/login/. NOTE: this issue was originally assigned CVE-2012-3542 by mistake.
OpenStack Keystone, as used in OpenStack Folsom before folsom-rc1 and OpenStack Essex (2012.1), allows remote attackers to add an arbitrary user to an arbitrary tenant via a request to update the user's default tenant to the administrative API. NOTE: this identifier was originally incorrectly assigned to an open redirect issue, but the correct identifier for that issue is CVE-2012-3540.
OpenStack Keystone before 2012.1.1, as used in OpenStack Folsom before Folsom-1 and OpenStack Essex, does not properly implement token expiration, which allows remote authenticated users to bypass intended authorization restrictions by (1) creating new tokens through token chaining, (2) leveraging possession of a token for a disabled user account, or (3) leveraging possession of a token for an account with a changed password.
Session fixation vulnerability in OpenStack Dashboard (Horizon) folsom-1 and 2012.1 allows remote attackers to hijack web sessions via the sessionid cookie.
Cross-site scripting (XSS) vulnerability in the refresh mechanism in the log viewer in horizon/static/horizon/js/horizon.js in OpenStack Dashboard (Horizon) folsom-1 and 2012.1 and earlier allows remote attackers to inject arbitrary web script or HTML via the guest console.