PT-2026-61617 · Heyform · Heyform

CVE-2026-45797 · Published 2026-07-20 · Updated 2026-07-20

Positive Technologies (AI Summary)

CVSS v4.0

6.4

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions HeyForm versions prior to 3.0.0-rc.7

Description The /api/upload endpoint allows unauthenticated users to upload files, including SVG files. These files are stored in the static assets directory and served with the Content-Type: image/svg+xml header. This allows an attacker to perform stored cross-site scripting (XSS), a technique where malicious scripts are permanently stored on the target server and executed in the browser of other users visiting the affected page.

Recommendations Update to version 3.0.0-rc.7.

Exploit

Fix

Unrestricted File Upload

XSS

Weakness Enumeration

CWE-434

CWE-79

Related Identifiers

CVE-2026-45797

GHSA-M94H-JXVC-HHCH

Affected Products

Heyform

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45797.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-45797 · Security Note
• https://osv.dev/vulnerability/CVE-2026-45797 · Vendor Advisory
• https://github.com/heyform/heyform/security/advisories/GHSA-m94h-jxvc-hhch · Note
• https://github.com/heyform/heyform/commit/144240e5545d10fd9e120d05ccb402a6d7064674 · Note
• https://twitter.com/CVEnew/status/2079238907774763244 · Twitter Post