{"items":[{"id":"NVI-00011813","kind":"vulnerability","title":"ApostropheCMS: Client-side Prototype Pollution in apos.http.parseQuery leading to DOM-based XSS against authenticated users","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-m2m5-rw3w-cwmj","CVE-2026-113659"],"plain_summary":"GitHub lists this reviewed advisory for apostrophe. 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-3c2a27b1f40f704405a8248a144dc35d"],"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":"2026-10-20T18:18:52.000Z","value":"6.1 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-376024631415ca9ba19c7738f871fd24"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.345%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.28059. Missing scores are unknown.","source_id":"sr-3c2a27b1f40f704405a8248a144dc35d"}],"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-376024631415ca9ba19c7738f871fd24","url":"https://github.com/advisories/GHSA-m2m5-rw3w-cwmj","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-m2m5-rw3w-cwmj","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:13:39.183Z"},{"id":"sr-3c2a27b1f40f704405a8248a144dc35d","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-2026-113659","publisher":"FIRST EPSS","observed_at":"2026-11-01T01:39:43.067Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-376024631415ca9ba19c7738f871fd24"],"technology":"apostrophe","known_exclusions":[],"conditions_summary":"## Summary\n\nThe client-side helper `apos.http.parseQuery()` in ApostropheCMS builds a nested object\nfrom a URL query string without sanitizing the keys `__proto__`, `constructor`, or\n`prototype`. Parsing an attacker-controlled query string therefore writes arbitrary\nproperties onto `Object.prototype` (client-side prototype pollution).\n\nApostropheCMS's admin UI calls this parser with `window.location.search` on **every\nauthenticated page load** (the admin context bar's `data()` initializer). Because the admin\nUI is built on Vue, a polluted, enumerable property on `Object.prototype` is then picked up\nby Vue's standard element-mount routine and written to the DOM as an element property,\nturning the prototype pollution into DOM-based XSS in the victim's authenticated session.\nThe escalation gadget is a well-known, general Vue behavior; the novel,\nreportable defect is the unsanitized `parseQuery` source together with the authenticated\ntrigger, both of which are ApostropheCMS code.\n\nAny user who can get **any logged-in user (from the lowest-privileged `guest` role up to the highest-privileged `admin` role)** to\nopen a crafted URL can execute arbitrary JavaScript in that user's session.\n\n","public_affected_ranges":["< 4.33.0"]}],"null_published_at":"2026-11-01T14:34:14.122Z","source_updated_at":"2026-10-20T18:18:52.000Z","source_disclosed_at":"2026-10-20T18:18:49.000Z","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":"2026-10-31T23:13:39.183Z"},{"id":"NVI-00011813","kind":"vulnerability","title":"ApostropheCMS: Client-side Prototype Pollution in apos.http.parseQuery leading to DOM-based XSS against authenticated users","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-m2m5-rw3w-cwmj","CVE-2026-113659"],"plain_summary":"GitHub lists this reviewed advisory for apostrophe. 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-376024631415ca9ba19c7738f871fd24"],"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":"2026-10-20T18:18:52.000Z","value":"6.1 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-376024631415ca9ba19c7738f871fd24"}],"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-376024631415ca9ba19c7738f871fd24","url":"https://github.com/advisories/GHSA-m2m5-rw3w-cwmj","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-m2m5-rw3w-cwmj","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:13:39.183Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-376024631415ca9ba19c7738f871fd24"],"technology":"apostrophe","known_exclusions":[],"conditions_summary":"## Summary\n\nThe client-side helper `apos.http.parseQuery()` in ApostropheCMS builds a nested object\nfrom a URL query string without sanitizing the keys `__proto__`, `constructor`, or\n`prototype`. Parsing an attacker-controlled query string therefore writes arbitrary\nproperties onto `Object.prototype` (client-side prototype pollution).\n\nApostropheCMS's admin UI calls this parser with `window.location.search` on **every\nauthenticated page load** (the admin context bar's `data()` initializer). Because the admin\nUI is built on Vue, a polluted, enumerable property on `Object.prototype` is then picked up\nby Vue's standard element-mount routine and written to the DOM as an element property,\nturning the prototype pollution into DOM-based XSS in the victim's authenticated session.\nThe escalation gadget is a well-known, general Vue behavior; the novel,\nreportable defect is the unsanitized `parseQuery` source together with the authenticated\ntrigger, both of which are ApostropheCMS code.\n\nAny user who can get **any logged-in user (from the lowest-privileged `guest` role up to the highest-privileged `admin` role)** to\nopen a crafted URL can execute arbitrary JavaScript in that user's session.\n\n","public_affected_ranges":["< 4.33.0"]}],"null_published_at":"2026-11-01T01:03:56.607Z","source_updated_at":"2026-10-20T18:18:52.000Z","source_disclosed_at":"2026-10-20T18:18:49.000Z","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":"2026-10-31T23:13:39.183Z"}],"next_cursor":null,"snapshot_revision":"40769"}