{"items":[{"id":"NVI-00018276","kind":"vulnerability","title":"SillyTavern has a reflected XSS vulnerability in the CORS proxy middleware","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-xc4x-2452-5gc9","CVE-2026-44651"],"plain_summary":"GitHub lists this reviewed advisory for sillytavern. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-04f32e672e8ca012e325084bc1dcce22"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-04f32e672e8ca012e325084bc1dcce22","url":"https://github.com/advisories/GHSA-xc4x-2452-5gc9","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-xc4x-2452-5gc9","publisher":"GitHub Advisory Database","observed_at":"2026-11-06T20:56:39.448Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-04f32e672e8ca012e325084bc1dcce22"],"technology":"sillytavern","known_exclusions":[],"conditions_summary":"## Resolution\n\nFixed in SillyTavern 1.18.0: a user-provided URL is no longer reflected in the HTTP response body.\n\n## Overview\n- Vulnerability Type: XSS\n- Affected Location: `src/middleware/corsProxy.js:40`\n- Trigger Scenario: reflected XSS in CORS proxy error response\n\n## Root Cause\nWhen `fetch(url)` throws, the code sends:\n`res.status(500).send('Error occurred while trying to proxy to: ' + url + ' ' + error)`.\nThe `url` value is attacker-controlled (`req.params.url`) and is not HTML-escaped before rendering.\n\n## Source-to-Sink Chain\n1. Source (user-controlled input)\n- Entry point: `GET /proxy/:url(*)`\n\n2. Data flow\n- Code analysis shows concrete propagation into this sink:\n  - vulnerability title: `Reflected XSS in CORS proxy error response`\n  - sink location reached by attacker-controlled input: `src/middleware/corsProxy.js:40`\n- The same sink behavior is confirmed by controlled execution observations.\n\n3. Sink (dangerous operation)\n- Sink location: `src/middleware/corsProxy.js:40`\n- Vulnerable behavior: reflected XSS in CORS proxy error response\n\n## Exploitation Preconditions\n1. The attacker can inject controllable content into a rendered response.\n2. The vulnerable rendering c","public_affected_ranges":["<= 1.17.0"]}],"null_published_at":"2026-11-07T07:07:39.800Z","source_updated_at":"2026-06-09T10:32:15.000Z","source_disclosed_at":"2026-05-12T22:23:56.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-06T20:56:39.448Z"}],"next_cursor":null,"snapshot_revision":"42594"}