Public proof of conceptFix available

CVE-2026-44649

Q: Is CVE-2026-44649 actively exploited?

A proof-of-concept exploit exists for CVE-2026-44649, but active exploitation has not been confirmed at this time.

Q: What is the CVSS score for CVE-2026-44649?

CVE-2026-44649 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2026-05-29
Fixed in1.18.0
WeaknessCWE-290 · CWE-306 · CWE-346

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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 accepts Remote-User (Authelia) and X-Authentik-Username (Authentik) HTTP headers to automatically log in users when SSO is configured. There is no validation that these headers originate from a trusted reverse proxy. Any network client that can reach the SillyTavern port directly can inject these headers and authenticate as any user, including administrators, without a password. This vulnerability is exploitable only when sso.autheliaAuth: true or sso.authentikAuth: true is set in config.yaml (both default to false). This vulnerability is fixed in 1.18.0.

Timeline

dates in UTC

2026-05-2919:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-44649?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-44649?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

OSV

sillytavern

Branch	Affected	Fixed in	Source
1.18	< 1.18.0	1.18.0	OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update sillytavern to 1.18.0

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionpoc2026-06-02
OpenCVESSVC decisionpoc—
CNACVSS 3.19.8read 2026-10-23
CNAweakness (CWE)CWE-290, CWE-306, CWE-346, CWE-807read 2026-10-23
FIRST EPSSEPSS score0.3 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2026-05-29
Last Modified: 2026-07-22
NVD status: Deferred

Frequently asked questions

What is CVE-2026-44649?

Is CVE-2026-44649 actively exploited?

A proof-of-concept exploit exists for CVE-2026-44649, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-44649?

CVE-2026-44649 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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