Weakness (CWE)
CWE-384: Session Fixation
Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.
More detail
Such a scenario is commonly observed when:
- A web application authenticates a user without first invalidating the existing session, thereby continuing to use the session already associated with the user.
- An attacker is able to force a known session identifier on a user so that, once the user authenticates, the attacker has access to the authenticated session.
- The application or container uses predictable session identifiers.
In the generic exploit of session fixation vulnerabilities, an attacker creates a new session on a web application and records the associated session identifier. The attacker then causes the victim to associate, and possibly authenticate, against the server using that session identifier, giving the attacker access to the user's account through the active session.
How to prevent it (3 mitigations)
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Architecture and Design
Invalidate any existing session identifiers prior to authorizing a new user session.
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Architecture and Design
For platforms such as ASP that do not generate new values for sessionid cookies, utilize a secondary cookie. In this approach, set a secondary cookie on the user's browser to a random value and set a session variable to the same value. If the session variable and the cookie value ever don't match, invalidate the session, and force the user to log on again.
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Operation
Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].
Source: MITRE CWE-384
327 results · Feed
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High 8.8
IBM Verify Directory is affected by multiple vulnerabilities
IBM Security Verify Directory 10.0.0 through 10.0.4 and IBM Verify Directory 11.0.0 is vulnerable to session fixation. An attacker can establish a session and, after the victim authenticates, hijack the authenticated session to gain unauthorized access to the…
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Medium 6.4
Keycloak-services: keycloak-services: oidc logout endpoint session fixation via id_token_hint leading to account takeover
A flaw was found in the OIDC logout endpoint of the keycloak-services component, which handles user session termination in Red Hat Build of Keycloak. The issue occurs because the system sets a session cookie based on an unvalidated token hint before completin…
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Medium 6.3
mathurvishal CloudClassroom-PHP-Project loginlinkadmin.php session_regenerate_id session fixiation
A vulnerability was determined in mathurvishal CloudClassroom-PHP-Project. The affected element is the function session_regenerate_id of the file loginlinkadmin.php. Executing a manipulation of the argument PHPSESSID can lead to session fixiation. The attack …
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High 7.2
Apache Wicket: The session id is renewed only on the first sign in, not on re-authentication
Session fixation in Apache Wicket. org.apache.wicket.authroles.authentication.AuthenticatedWebSession is the authentication base class of Wicket's role-based security module, and its signIn(String, String) method is the entry point through which an applicatio…
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High 8.1
Jenkins 2.587 and earlier, LTS 2.580.1 and earlier allows requests authenticated using HTTP Basic authentication, inclu…
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Medium 6.8
Python Social Auth: OpenID Connect nonce is not bound to the browser session, so a stolen authorization code logs the attacker in as the victim
Python Social Auth is a social authentication and registration mechanism. Prior to 6.2.0, OpenIdConnectAuth in social_core/backends/open_id_connect.py uses get_and_store_nonce to place the OpenID Connect nonce in a shared OpenIdConnectAssociation table, and g…
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High 8.1
OpenHuman /auth/telegram CSRF allows attacker-controlled session implantation
OpenHuman is an open-source agent harness available as a desktop application and Rust library. Versions before 0.56.0 allow cross-site request forgery against the unauthenticated GET /auth/telegram loopback callback because telegram_auth_handler consumes an a…
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High 8.1
WeGIA: Session Fixation via User-Controlled PHPSESSID Cookie + DB_HOST Leak in html/seguranca/sessionStart.php
WeGIA is a web manager for charitable institutions. Prior to 3.8.6, the auto-prepended web/html/seguranca/sessionStart.php reflects an attacker-supplied PHPSESSID cookie in a Set-Cookie response and uses DB_HOST as the cookie domain. If a victim authenticates…
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High 7.3
WordPress Broadcast Live Video plugin <= 7.3.2 - Session Hijacking vulnerability
Session Fixation vulnerability in VideoWhisper.com Broadcast Live Video videowhisper-live-streaming-integration allows Session Hijacking.This issue affects Broadcast Live Video: from n/a through 7.3.2.
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Critical 9.1
IBM WebSphere Application Server Liberty is affected by an authentication bypass
IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.10 is vulnerable by an authentication bypass vulnerability when samlWeb-2.0 feature is enabled.
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High 8.8
Omnispace Agora Project < 26.10.0 Session Fixation via Authentication
Omnispace Agora Project before 26.10.0 contains a session fixation vulnerability that allows remote attackers to hijack authenticated sessions by planting a known session identifier in a victim's browser prior to login. Attackers can exploit the application's…
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Critical 9.1
An issue in ProPhoenix Law RMS v2022.2403.3.101 allows attackers to execute a session hijacking attack via injecting a …
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Medium 6.8
AsyncHttpClient: Cookies received over plaintext HTTP can plant, overwrite or delete Secure cookies set over HTTPS
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 2.1.0 until 3.0.14, the default ThreadSafeCookieStore does not retain whether a Set-Cookie response used a secure transp…
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Medium 4.0
AsyncHttpClient: Incomplete origin checks in the default cookie store allow cookie tossing onto public-suffix and IP-address hosts
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 2.16.0 until 3.0.14, ThreadSafeCookieStore incompletely validates cookie Domain attributes. Missing private-section and …
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Critical 9.3
Apache Jackrabbit: Pre-auth hijack of cached sessions via derivable WebDAV lock tokens
: Session Fixation / Session Reuse across Users vulnerability in Apache Jackrabbit. Jackrabbit WebDAV server attaches a cached authenticated session on any Lock-Token/TransactionId/SubscriptionId/If-header field token match with no credential check. This issu…
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Medium 6.3
kishor-23 food-waste-management-system Login Flow login.php session fixiation
A vulnerability has been found in kishor-23 food-waste-management-system 411989e3ecb82895e53dca7865f72145f03d7d93/b3a70b2c492dc9904de5be1ad9389bd79b87f82c. This affects an unknown function of the file login.php of the component Login Flow. Such manipulation o…
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Medium 6.8
YesWiki before 4.6.7 Session Fixation via Login in AuthController.php
YesWiki before 4.6.7 contains a session fixation vulnerability that allows attackers to hijack authenticated sessions because login does not regenerate the PHP session ID. Attackers who set or learn a victim's pre-authentication YesWiki-* session cookie can r…
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Critical 9.4
Undisclosed RCE in Zammad v6.3 and higher
Zammad versions 6.3.0 to 6.5.4 are vulnerable a session hijack vulnerability that leads to remote code execution as the zammad user. The bug is also present in version 7.0.0 to version 7.1.2, but not exploitable due to changes in the underlying framework.
KEV Oct 2, 2026 -
High 7.1
Toptech TMS7 and TopHAT Session Fixation
The application accepts user-supplied session identifiers and does not regenerate the session ID after authentication. This allows an attacker to predefine a session ID and reuse it after victim authentication, resulting in session takeover.
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Low 1.7
Customer session fixation
If an attacker is able to convince a victim on a specially crafted link, the victim is logged in to the attacker's customer account. If the victim does not notice this, this might lead to their order details being stored into the attacker's account. The attac…
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Critical 9.8
Apache Qpid Broker-J: Missing HTTP-session renewal after successful authentication
Session fixation in HTTP management authentication allows remote attackers to gain unauthorized access to an authenticated management session via reuse of a session identifier retained across successful authentication. This issue affects Apache Qpid Broker-J:…
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Medium 4.2
social-auth-core has a Session Fixation issue
Python Social Auth is a social authentication/registration mechanism. Prior to version 5.0.0, the partial-pipeline resume mechanism accepted `partial_token` as a bearer credential without binding it to the browser session that created it. Applications using r…
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Medium 4.3
Mstfakts College-Management-System Authentication server.php session_start session fixiation
A vulnerability was determined in Mstfakts College-Management-System. This affects the function session_start of the file Front-end/server.php of the component Authentication. Executing a manipulation can lead to session fixiation. It is possible to launch th…
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Medium 6.8
webpy web.py 0.76 is vulnerable to Session Fixation. The component Session._load() reads session_id directly from the r…
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High 7.1
hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in ValidateOAuthState
Hatchet is a platform for orchestrating background tasks, AI agents, and durable workflows at scale. Prior to 0.91.1, ValidateOAuthState clears the oauth_state_ session value to an empty string after a successful OAuth callback and later accepts an empty stat…
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Medium 4.2
Apache Airflow: Session cookie silently overrides explicit Authorization bearer header, enabling session fixation
When a request to the Airflow core API carries both a session cookie and an explicit `Authorization: Bearer` token, Airflow resolves the caller from the cookie and ignores the bearer token, inverting the intended precedence of bearer over cookie. The request …
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Low 3.7
SysReptor: Session Fixation in Password-Protected Shared Notes
SysReptor is a fully customizable pentest reporting platform. Prior to 2026.68, the password authentication flow for protected shared notes does not rotate the session identifier after successful authentication, allowing session fixation. An attacker who can …
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High 7.4
Session id is not renewed on authentication in ash_authentication, allowing session fixation
Session Fixation vulnerability in team-alembic ash_authentication allows an attacker who can plant a session identifier in a victim's browser to hold an authenticated session once that victim signs in. AshAuthentication.Plug.Helpers.store_in_session/2 writes …
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High 8.8
Opencast: Session fixation in login enables account takeover via crafted link
Opencast is a free, open-source platform to support the management of educational audio and video content. Prior to versions 19.7 and 20.2, the default security configuration in etc/security/mh_default_org.xml accepts a client-selected JSESSIONID from the ;js…
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High 8.1
HUBzero CMS through 2.2.32 Session Fixation via Query-String Session Identifier
HUBzero CMS through 2.2.32 accepts session identifiers from query strings and request variables instead of cookies alone, allowing unauthenticated attackers to fixate victim sessions. Attackers can obtain a valid session identifier, send victims a crafted lin…
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High 8.8
Flaw in Neuvector can result in one user receiving another user's authenticated session when multiple SSO login attempts occur concurrently
For users authenticated through SAML or OpenID Connect (OIDC), this vulnerability can result in one user receiving another user's authenticated session when multiple SSO login attempts occur concurrently
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High 7.4
djust: SSE sessions are not bound to the authenticated user; the client-chosen session_id is the sole authorization capability (session hijack)
djust provides Phoenix LiveView-style reactive server-side rendering for Django with Rust-powered performance. Prior to version 1.0.7, SSE sessions were keyed solely by a client-chosen `session_id` with no binding to the authenticated user — a control the Web…
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Medium 6.8
Http4s: CookieJar middleware accepts arbitrary Set-Cookie domain
Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, The CookieJar client middleware stores a response cookie’s Domain attribute without checking that it domain-matches the host that supplied the cookie or rejecting public suffixes. …
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High 8.3
Session Fixation
Session fixation vulnerability in Secomea GateManager (webserver module) allows Session Fixation. This issue affects GateManager: 11.5;0, 11.4.625515072:0. Fixed in Version 11.6 or 11.4.626194074 and above
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Medium 5.3
tirreno has Session Fixation in Login Authentication
tirreno, a security framework, has a session fixation issue in versions prior to 0.10.0. During authentication, tirreno validates the user's credentials and establishes the authenticated session, but it does not call `session_regenerate_id()` afterward. As a …
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Medium 6.3
ningzichun Student Management System login.php session_start session fixiation
A vulnerability was found in ningzichun Student Management System up to 98760f5711cf6dc8b4adca53a9e207ca49b02ebf. Affected by this vulnerability is the function session_start of the file login.php. The manipulation results in session fixiation. The attack can…
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High 7.4
Photoshop Mobile | Session Fixation (CWE-384)
Photoshop Mobile is affected by a Session Fixation vulnerability that could result in privilege escalation. An attacker could leverage this vulnerability to gain access to sensitive resources. Exploit depends on conditions beyond the attacker's control. Explo…
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Medium 6.3
SourceCodester Syllabus-Aligned Learning Management & Examination System Login auth_process.php session fixiation
A vulnerability was determined in SourceCodester Syllabus-Aligned Learning Management & Examination System 1.0. The impacted element is an unknown function of the file auth_process.php of the component Login. This manipulation causes session fixiation. It is …
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Critical 9.8
An issue in HubCore v.14.1.1 allows a remote attacker to escalate privileges via the HUBCOREID session cookie handling …
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High 7.6
Session Fixation in MISP CustomAuth Authentication Allows Session Hijacking
MISP contains a session fixation vulnerability in the CustomAuth authentication (a custom configuration) flow. When a user was successfully authenticated through CustomAuth, MISP stored the authenticated user identity in the existing session without first rot…