CVE-2026-44648
SillyTavern: Existing sessions are not invalidated after password change, allowing session reuse and account takeover
- Published
- May 29, 2026
- Updated
- May 29, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 26, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 33.4%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1Proof-of-concept exploit and advisory for CVE-2026-44648, demonstrating the vulnerability and providing technical details for assessment.
Responsible use
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