{"items":[{"id":"NVI-00008327","kind":"vulnerability","title":"Cross-site scripting (XSS) from image block content in the site frontend","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-cq58-r77c-5jjw","CVE-2021-41258"],"plain_summary":"OSV carries this publisher advisory for getkirby/cms. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 3.5.8 for getkirby/cms. Confirm the publisher’s latest guidance.","source_ids":["sr-fed86c05f281e857604f2d38f6eb8f20"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-03f4d44bf2fb7582553348e3c41f3f11"],"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":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.807%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.56828. Missing scores are unknown.","source_id":"sr-03f4d44bf2fb7582553348e3c41f3f11"}],"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-fed86c05f281e857604f2d38f6eb8f20","url":"https://github.com/advisories/GHSA-cq58-r77c-5jjw","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-cq58-r77c-5jjw","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:10.702Z"},{"id":"sr-03f4d44bf2fb7582553348e3c41f3f11","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-2021-41258","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:03.704Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-fed86c05f281e857604f2d38f6eb8f20"],"technology":"getkirby/cms","known_exclusions":[],"conditions_summary":"### Impact\n\nKirby's blocks field stores structured data for each block. This data is then used in block snippets to convert the blocks to HTML for use in your templates. We recommend to escape HTML special characters against cross-site scripting (XSS) attacks.\n\nCross-site scripting (XSS) is a type of vulnerability that allows to execute any kind of JavaScript code inside the site frontend or Panel session of other users. If the user is logged in to the Panel, a harmful script can for example trigger requests to Kirby's API with the permissions of the victim.\n\nThe default snippet for the image block unfortunately did not use our escaping helper. This made it possible to include malicious HTML code in the source, alt and link fields of the image block, which would then be displayed on the site frontend and executed in the browsers of site visitors and logged in users who are browsing the site.\n\nThis vulnerability is critical if you might have ","public_affected_ranges":["ECOSYSTEM: introduced 3.5.0; fixed 3.5.8"]}],"null_published_at":"2026-10-31T22:13:44.218Z","source_updated_at":"2026-07-08T06:29:53.438Z","source_disclosed_at":"2021-11-16T17:04:41.000Z","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":"2026-10-31T21:42:10.702Z"}],"next_cursor":null,"snapshot_revision":"42594"}