[HIGH] Grav: Path Traversal in ImageMedium::watermark() — arbitrary file disclosure via publicly-cached images

PKSA-89qq-5khy-n4c4 CVE-2026-69089 GHSA-w3f4-8pj2-599w

Affected package: getgrav/grav

Affected version: =2.0.10

Reported by:
GitHub