CVE-2026-63429Disclosure

LOWCVSS 8.6 · HIGH

Signal is active with 2 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

HeyForm is an open-source form builder. Prior to version 3.0.0-rc.9, `POST /api/upload` has no authentication guard, no global guard, no form-context validation, no `openToken` requirement, and no session cookie check. Any anonymous internet user can upload files (PDF, DOC/DOCX, XLS/XLSX, CSV, TXT, MP4, images, etc., up to 10 MB) and receive a permanent public URL on the HeyForm domain. The endpoint is used by both authenticated form creators and unauthenticated form submitters; because no form-context binding exists, every request to it is anonymously accepted. Version 3.0.0-rc.9 contains a patch for the issue.

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0.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-306CWE-434

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

Patch or workaround signal is available
2 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 2 signals
Disclosure: 2 classified signals
2 total mentions across 1 day

Deep dive

Activity timeline2 mentions / 1d

Signal classification1 categories

Disclosure

2100.0%

Referenced assets2 URLs

By indicator

Full discourse2 posts

Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters92d
Disclosure
#CVE-2026-63429 - Critical auth bypass in Heyform open-source form builder. Anonymous users can upload files up to 10MB to a public URL with no authentication checks. #CVSS 8.6. No patch yet - restrict access immediately. #CVEAlert #devops #devsecops #developer #sysadmin #Heyform #infosec https://www.valtersit.com/cve/CVE-2026-63429
Post summary
A newly disclosed CVE reveals an authentication bypass in Heyform enabling anonymous users to upload large files, with no patch yet available and an immediate recommendation to restrict access.
0000038
985 followersView on X
CVE@CVEnew92d
Disclosure
CVE-2026-63429 HeyForm is an open-source form builder. Prior to version 3.0.0-rc.9, `POST /api/upload` has no authentication guard, no global guard, no form-context validation, no `… https://www.cve.org/CVERecord?id=CVE-2026-63429
Post summary
The text announces that HeyForm’s /api/upload endpoint lacks authentication and validation prior to v3.0.0-rc.9, detailing the security flaw behind CVE-2026-63429.
00000869
57.8K followersView on X

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