Possible fix(deps): 2 vulnerable dependencies in package-lock.json

[begininvoke]

Came across something in ComUICoder/my-vue-app/package-lock.json around line 1069 that looked worth flagging.

HIGH severity dependency vulnerability: CVE-2026-45623 — Arbitrary Local File Read in PostCSS (installed 8.5.6; all versions <= 8.5.11 are affected). PostCSS's PreviousMap feature parses any /*# sourceMappingURL=PATH */ comment embedded in CSS passed to process() and dereferences PATH against the local filesystem with no scheme check, allowlist, or path-traversal validation. An attacker who controls the CSS input (user-uploaded stylesheets, CMS themes, blog comment renderers, build pipelines for third-party packages, etc.) can force the Node process to read any file readable by the user, leaking ~10 bytes of its content via the JSON.parse SyntaxError message, obtaining a precise file-existence oracle, or causing DoS through reads of large files. Exploitation works with PostCSS's default options — no from, map, or plugins are required — so any pipeline that processes untrusted CSS is directly reachable. Because this finding is in package-lock.json, the fix is a dependency upgrade to 8.5.12 (which adds scheme/allowlist/traversal validation to PreviousMap) rather than an application code change; exposure for a Vue app depends on whether untrusted or third-party CSS flows through PostCSS in dev servers, build tooling, or uploaded-content processing.

Something like this might fix it:

Do not hand-edit package-lock.json (integrity hashes must be regenerated by npm). Apply via the CLI:

```
# If postcss is a direct dependency:
npm install postcss@^8.5.12
# or: npm audit fix
```

If postcss is only a transitive dependency, force the patched version with an override in package.json:

```diff
--- a/ComUICoder/my-vue-app/package.json
+++ b/ComUICoder/my-vue-app/package.json
@@
   "dependencies": {
-    "postcss": "^8.5.6"
+    "postcss": "^8.5.12"
   },
+  "overrides": {
+    "postcss": "^8.5.12"
+  }
```

Then re-run `npm install` and expect the following change in package-lock.json (lines 1069-1096):

```diff
--- a/ComUICoder/my-vue-app/package-lock.json
+++ b/ComUICoder/my-vue-app/package-lock.json
@@
     "node_modules/postcss": {
-      "version": "8.5.6",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.6.tgz",
-      "integrity": "sha512-<old-integrity-hash>",
+      "version": "8.5.12",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.12.tgz",
+      "integrity": "sha512-<new-integrity-hash>",
       "engines": {
         "node": "^10 || ^12 || >=14"
       }
     }
```

Verification:
1. `npm ls postcss` — all resolved instances must report 8.5.12 (check transitive consumers such as autoprefixer, css-loader/vue-loader, tailwind, etc.).
2. `npm audit` — CVE-2026-45623 should no longer be reported.
3. As defense-in-depth for pipelines handling untrusted CSS, avoid passing attacker-controlled `sourceMappingURL` comments through PostCSS (strip or sanitize them pre-processing) until the upgrade is deployed.

For reference: rule CVE-2026-45623. Rated high.

I may be wrong about this one — closing it costs you nothing if so.

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Found with automated scanning (RedGem) and reviewed before opening. If it is not useful, closing it is completely fine.