SITEMAP_MALFORMED
sitemap.xml is not valid XML
No automatic fix — this needs a manual change on your siteWhat this check looks at
Whether an existing sitemap.xml can actually be parsed as XML.
Why AI answer engines care
An unparseable sitemap defeats the same purpose as having no sitemap at all.
Does Synviber fix it for me?
Not currently — this one needs a manual change on your own site or infrastructure; Synviber can detect it but does not publish an automatic fix for it today.
How to fix it manually
Medium severity
Scanner message: "sitemap.xml exists but is not valid XML"
Regenerate sitemap.xml as well-formed XML (a single <urlset> root with <url><loc> entries) — most site generators and CMS sitemap plugins produce a valid one automatically.