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CVE-2026-61456

MEDIUM Exploitation: PoC
4.6
CVSS 3.1
Description
The Grav API plugin (getgrav/grav-plugin-api) before 1.0.3 fails to sanitize SVG files uploaded through the POST /api/v1/media endpoint. The HandlesMediaUploads::processUploadedFile() method validates only the file extension and never invokes Security::sanitizeSVG(), so an authenticated attacker with the api.media.write permission can upload an SVG containing arbitrary JavaScript. The file is stored unmodified and served with Content-Type: image/svg+xml; when an administrator opens it in a browser (directly or via <object>/<iframe>), the embedded script executes in their session context, enabling cookie theft and session hijacking.

Metadata

CVE ID
CVE-2026-61456
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-07-09 14:07 UTC
Published
2026-07-10 13:58 UTC
Last updated
2026-07-10 14:45 UTC
Primary CWE
CWE-79
Improper Neutralization of Input During Web Page Generation …
Vendor / Product
getgrav / grav
Sources
cve.org  ·  NVD

Severity & Metrics

4.6 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
getgrav grav — 0 < 1.0.3, 1.0.3
Weakness (CWE)
CWESourceDescription
CWE-79 cna Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS scores (2)
ScoreSeverityVersionSourceVector
5.1 MEDIUM 4.0 cna CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
4.6 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
References (2)
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