{"items":[{"id":"NVI-00016270","kind":"vulnerability","title":"Hono: Server-Side XSS via JSX Escaping Bypass in cx() Utility","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-w62v-xxxg-mg59","CVE-2026-59895"],"plain_summary":"GitHub lists this reviewed advisory for hono. 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-0173e4de9b644a758b3c8f9b030ccdbf"],"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":[{"kind":"CVSS","as_of":"2026-07-21T18:33:50.000Z","value":"6.1 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-5bde305942921c6af11292dbedc0900c"},{"kind":"EPSS","as_of":"2026-11-06T12:00:23.000Z","value":"0.327%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.2591. Missing scores are unknown.","source_id":"sr-0173e4de9b644a758b3c8f9b030ccdbf"}],"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-5bde305942921c6af11292dbedc0900c","url":"https://github.com/advisories/GHSA-w62v-xxxg-mg59","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-w62v-xxxg-mg59","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T22:34:49.300Z"},{"id":"sr-0173e4de9b644a758b3c8f9b030ccdbf","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-59895","publisher":"FIRST EPSS","observed_at":"2026-11-07T00:50:47.048Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-5bde305942921c6af11292dbedc0900c"],"technology":"hono","known_exclusions":[],"conditions_summary":"### Summary\n\n`cx()` in `hono/css` composes class names from plain strings but marks the result as already-escaped without HTML-escaping the input. When the result is used as a JSX `class` attribute during server-side rendering, the value is written into the attribute unescaped, so untrusted input can break out of the `class` attribute and inject arbitrary markup, leading to Cross-Site Scripting (XSS).\n\n### Details\n\nBecause the composed value is treated as pre-escaped, the HTML attribute escaping normally applied to interpolated values is skipped, and characters such as `\"` pass through unescaped — allowing a value to terminate the attribute and add further attributes or elements. This arises when an application passes untrusted, user-controlled input as a class name to `cx()`, for example when merging a base class with an externally provided `className`.\n\n### Impact\n\nDuring server-side rendering, an attacker who controls a value passed to `cx()` can inject arbitrary HTML into the page, resulting in stored or reflected XSS in the victim's browser.\n\nThis may lead to:\n\n- Execution of attacker-controlled script in the victim's browser session.\n- Session hijacking, credential theft, or ","public_affected_ranges":[">= 4.0.0, < 4.12.27"]}],"null_published_at":"2026-11-07T22:29:26.080Z","source_updated_at":"2026-07-21T18:33:50.000Z","source_disclosed_at":"2026-07-21T18:33:50.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-11-03T22:34:49.300Z"},{"id":"NVI-00016270","kind":"vulnerability","title":"Hono: Server-Side XSS via JSX Escaping Bypass in cx() Utility","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-w62v-xxxg-mg59","CVE-2026-59895"],"plain_summary":"GitHub lists this reviewed advisory for hono. 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-5bde305942921c6af11292dbedc0900c"],"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":[{"kind":"CVSS","as_of":"2026-07-21T18:33:50.000Z","value":"6.1 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-5bde305942921c6af11292dbedc0900c"}],"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-5bde305942921c6af11292dbedc0900c","url":"https://github.com/advisories/GHSA-w62v-xxxg-mg59","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-w62v-xxxg-mg59","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T22:34:49.300Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-5bde305942921c6af11292dbedc0900c"],"technology":"hono","known_exclusions":[],"conditions_summary":"### Summary\n\n`cx()` in `hono/css` composes class names from plain strings but marks the result as already-escaped without HTML-escaping the input. When the result is used as a JSX `class` attribute during server-side rendering, the value is written into the attribute unescaped, so untrusted input can break out of the `class` attribute and inject arbitrary markup, leading to Cross-Site Scripting (XSS).\n\n### Details\n\nBecause the composed value is treated as pre-escaped, the HTML attribute escaping normally applied to interpolated values is skipped, and characters such as `\"` pass through unescaped — allowing a value to terminate the attribute and add further attributes or elements. This arises when an application passes untrusted, user-controlled input as a class name to `cx()`, for example when merging a base class with an externally provided `className`.\n\n### Impact\n\nDuring server-side rendering, an attacker who controls a value passed to `cx()` can inject arbitrary HTML into the page, resulting in stored or reflected XSS in the victim's browser.\n\nThis may lead to:\n\n- Execution of attacker-controlled script in the victim's browser session.\n- Session hijacking, credential theft, or ","public_affected_ranges":[">= 4.0.0, < 4.12.27"]}],"null_published_at":"2026-11-04T10:04:27.925Z","source_updated_at":"2026-07-21T18:33:50.000Z","source_disclosed_at":"2026-07-21T18:33:50.000Z","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":"2026-11-03T22:34:49.300Z"}],"next_cursor":null,"snapshot_revision":"42594"}