# CVE-2026-121817: About Time Technologies｜Herowatch Go Server - Insecure Direct Object Reference

- Exploited (CISA KEV): no
- Published: 2026-11-04
- CVSS: 8.7 HIGH (v4.0)
- EPSS: no score
- CWE: CWE-639

Herowatch Go Server developed by About Time Technologies has a Insecure Direct Object Reference vulnerability. Authenticated remote attackers can modify specific parameters to access or operate other users' data and functions.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | No public claim | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | No public claim | — | — |
| Vercel | No public claim | — | — |
| F5 | No public claim | — | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

## Social

1 posts seen since 2026-11-04.

- bluesky 2026-11-04: CVE-2026-121817 - About Time Technologies｜Herowatch Go Server - Insecure Direct Object Reference CVE ID : CVE-2026-121817    Published : Nov. 4, 2026, 6:25 a.m. \| 39 minutes ago    Description : Herowatch Go Server developed by About Time Technologies has a Insecure Direct Obj... (https://bsky.app/profile/cve.skyfleet.blue/post/4xiervzurolwr)

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2026-121817 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2026-121817