CVE-2026-44648
SillyTavern: Existing sessions are not invalidated after password change, allowing session reuse and account takeover
Description
SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and text-to-speech voice models. Prior to 1.18.0, SillyTavern relies on cookie-session for authentication, storing all session data (user handle, permissions) in a signed cookie. The endpoints POST /api/users/change-password and POST /api/users/recover-step2 only update the password hash in the database but do not expire current sessions. Because the session is stateless and stored entirely in the client cookie, there is no server-side mechanism to revoke a token once issued. This vulnerability is fixed in 1.18.0.
INFO
Published Date :
May 29, 2026, 7:16 p.m.
Last Modified :
July 22, 2026, 6:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update SillyTavern to version 1.18.0 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-44648.
| URL | Resource |
|---|---|
| https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-wmm3-h9qj-p5v6 | |
| https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-wmm3-h9qj-p5v6 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-44648 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-44648
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-44648 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-44648 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 22, 2026
Action Type Old Value New Value Added Translation Title: SillyTavern, Description: SillyTavern es una interfaz de usuario instalada localmente que permite a los usuarios interactuar con modelos de lenguaje grandes de generación de texto, motores de generación de imágenes y modelos de voz de texto a voz. Antes de la 1.18.0, SillyTavern se basa en cookie-session para la autenticación, almacenando todos los datos de la sesión (identificador de usuario, permisos) en una cookie firmada. Los endpoints POST /API/users/change-password y POST /API/users/recover-step2 solo actualizan el hash de la contraseña en la base de datos pero no expiran las sesiones actuales. Debido a que la sesión es sin estado y se almacena completamente en la cookie del cliente, no existe un mecanismo del lado del servidor para revocar un token una vez emitido. Esta vulnerabilidad se corrige en la 1.18.0. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'SillyTavern', 'product': 'SillyTavern', 'versions': [{'status': 'affected', 'version': '< 1.18.0'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-44648', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-05-29T19:46:35.413163Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 29, 2026
Action Type Old Value New Value Added Reference https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-wmm3-h9qj-p5v6 -
New CVE Received by [email protected]
May. 29, 2026
Action Type Old Value New Value Added Description SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and text-to-speech voice models. Prior to 1.18.0, SillyTavern relies on cookie-session for authentication, storing all session data (user handle, permissions) in a signed cookie. The endpoints POST /api/users/change-password and POST /api/users/recover-step2 only update the password hash in the database but do not expire current sessions. Because the session is stateless and stored entirely in the client cookie, there is no server-side mechanism to revoke a token once issued. This vulnerability is fixed in 1.18.0. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Added CWE CWE-613 Added Reference https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-wmm3-h9qj-p5v6