{"items":[{"id":"NVI-00016385","kind":"vulnerability","title":"ApostropheCMS: Mutation-XSS / allowedTags bypass via literal `` solidus close","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-jxwj-j7wr-gfrw","CVE-2026-63670"],"plain_summary":"GitHub lists this reviewed advisory for sanitize-html. 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-6cd3f3d1c84ef1b40692eb522dbd39bb"],"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":"2026-09-03T20:07:17.000Z","value":"6.1 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-6cd3f3d1c84ef1b40692eb522dbd39bb"}],"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-6cd3f3d1c84ef1b40692eb522dbd39bb","url":"https://github.com/advisories/GHSA-jxwj-j7wr-gfrw","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-jxwj-j7wr-gfrw","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:21:29.477Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-6cd3f3d1c84ef1b40692eb522dbd39bb"],"technology":"sanitize-html","known_exclusions":[],"conditions_summary":"### Summary\nA mutation-XSS / allowedTags bypass: when `textarea` (or `xmp`) is included in `allowedTags`, an input containing a literal `` (a solidus right after the RCDATA end-tag name) lets non-allowed markup such as `` pass through `sanitizeHtml()` **live and unescaped**, even though `img`/`onerror` are not in the allowlist. A spec-compliant browser executes the surviving handler — XSS. This is a literal-solidus variant that bypasses the two most recent fixes in this code area (CVE-2026-40186, CVE-2026-44990), both already applied in 2.17.5. The default configuration is not affected.\n\n### Details\n`sanitize-html` emits the text content of HTML raw-text elements (`textarea`, `xmp`) without escaping. Two things combine:\n- **Parser differential:** on input, htmlparser2 does NOT recognize `` (solidus after the RCDATA\n  end-tag name) as a close tag; it emits `` as a single raw-text node.\n- **Unescaped passthrough:** the `ontext` handler (`index.js` ~575-583) appends `textarea`/`xmp` content with\n`result += text` (no `escapeHtml`), assuming it is \"already properly encoded\" — true for entity-decoded\n  content (what CVE-2026","public_affected_ranges":["<= 2.17.5"]}],"null_published_at":"2026-11-04T10:04:27.938Z","source_updated_at":"2026-09-03T20:07:17.000Z","source_disclosed_at":"2026-09-03T20:07:16.000Z","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":"2026-11-02T02:21:29.477Z"}],"next_cursor":null,"snapshot_revision":"42594"}