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CVE-2026-61607

Grav API Plugin: Stored XSS via SVG Upload - API Media Pipeline Bypasses Sanitizer

Published: Aug 19, 2026Updated: Aug 21, 2026 Sources: CVE List NVDCWE-79
4.6MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 89.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

Description

Grav API Plugin is a RESTful API for Grav CMS that provides full headless access to your site's content. Prior to 1.0.2, the Grav API plugin POST /api/v1/media pipeline in HandlesMediaUploads::processUploadedFile() validates an SVG filename extension but does not invoke Security::sanitizeSVG(). An attacker with api.media.write permission can store an SVG containing JavaScript, and the server returns the file as Content-Type: image/svg+xml so the script executes when a victim opens it, allowing session data theft and authenticated actions. This issue is fixed in version 1.0.2.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

getgrav
oss-projectaka grav-plugin-admin, getgrav/grav, grav
grav-plugin-apiOn-premWeb App
Web & CMS Plugins / cms-core

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/getgrav/grav-plugin-api/commit/d25eedb84a387f2c71b12a374f2a4b3d74339a7e
github.com
https://github.com/getgrav/grav-plugin-api/releases/tag/1.0.2
github.com
https://github.com/getgrav/grav/security/advisories/GHSA-7vhm-8x52-2r5p
github.com

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