diff --git a/apps/server/src/workspaces/logo.test.ts b/apps/server/src/workspaces/logo.test.ts
index 1eab123..0f1fb0b 100644
--- a/apps/server/src/workspaces/logo.test.ts
+++ b/apps/server/src/workspaces/logo.test.ts
@@ -22,6 +22,62 @@ describe("sanitizeSvg", () => {
     const out = sanitizeSvg(Buffer.from(dirty)).toString("utf8");
     expect(out).not.toMatch(/foreignObject/i);
   });
+
+  // Vectors the earlier regex-based sanitizer let through. The parser-based implementation
+  // blocks all of them; these cases exist so a "simplification" back to regexes fails CI
+  // rather than silently reopening the holes.
+  describe("vectors that defeat naive regex stripping", () => {
+    it("strips an unquoted javascript: href", () => {
+      const out = sanitizeSvg(Buffer.from(`<svg><a href=javascript:alert(1)><circle/></a></svg>`)).toString("utf8");
+      expect(out).not.toMatch(/javascript:/i);
+      expect(out).toContain("<circle");
+    });
+
+    it("strips a javascript: href hidden behind leading whitespace", () => {
+      const out = sanitizeSvg(Buffer.from(`<svg><a href=" javascript:alert(1)"><circle/></a></svg>`)).toString("utf8");
+      expect(out).not.toMatch(/javascript:/i);
+    });
+
+    it("strips a javascript: href broken up by control characters", () => {
+      const out = sanitizeSvg(Buffer.from(`<svg><a href="java\tscript:alert(1)"><circle/></a></svg>`)).toString("utf8");
+      expect(out).not.toMatch(/script:/i);
+    });
+
+    it.each(["iframe", "embed", "object", "video", "audio", "canvas"])("strips <%s>", (tag) => {
+      const out = sanitizeSvg(Buffer.from(`<svg><${tag} src="https://evil.test/x"></${tag}><rect/></svg>`)).toString("utf8");
+      expect(out.toLowerCase()).not.toContain(`<${tag}`);
+      expect(out).not.toContain("evil.test");
+      expect(out).toContain("<rect");
+    });
+
+    it("strips a self-closing <foreignObject/>", () => {
+      const out = sanitizeSvg(Buffer.from(`<svg><foreignObject/><rect/></svg>`)).toString("utf8");
+      expect(out).not.toMatch(/foreignObject/i);
+      expect(out).toContain("<rect");
+    });
+
+    it("strips inline style attributes", () => {
+      const out = sanitizeSvg(Buffer.from(`<svg><rect style="background:url(https://evil.test/x)"/></svg>`)).toString("utf8");
+      expect(out).not.toMatch(/style=/i);
+      expect(out).not.toContain("evil.test");
+    });
+
+    it("strips an external xlink:href while keeping same-document fragments", () => {
+      const external = sanitizeSvg(Buffer.from(`<svg><use xlink:href="https://evil.test/x#a"/></svg>`)).toString("utf8");
+      expect(external).not.toContain("evil.test");
+
+      const internal = sanitizeSvg(Buffer.from(`<svg><use xlink:href="#gradient"/></svg>`)).toString("utf8");
+      expect(internal).toContain("#gradient");
+    });
+
+    it("keeps ordinary drawing markup intact", () => {
+      const clean = `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M4 4h16v16H4z" fill="#123456"/></svg>`;
+      const out = sanitizeSvg(Buffer.from(clean)).toString("utf8");
+      expect(out).toContain("viewBox=\"0 0 24 24\"");
+      expect(out).toContain("d=\"M4 4h16v16H4z\"");
+      expect(out).toContain("fill=\"#123456\"");
+    });
+  });
 });
 
 describe("workspaceLogoUrl", () => {