# CVE-2026-4947: Insecure Direct Object Reference (IDOR) Leading to Signature Forgery in Foxit eSign

> Attackers can forge document signatures by manipulating object identifiers due to insufficient authorization checks in Foxit eSign.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Apr 2026
- **Updated:** 2 Apr 2026
- **Also known as:** GHSA-hw2m-7jfm-r9gq

## What is CVE-2026-4947?

CVE-2026-4947 is a high-severity missing authorization vulnerability in na1.foxitesign.foxit.com, published on 1 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Addressed a potential insecure direct object reference (IDOR) vulnerability in the signing invitation acceptance process. Under certain conditions, this issue could have allowed an attacker to access or modify unauthorized resources by manipulating user-supplied object identifiers, potentially leading to forged signatures and compromising the integrity and authenticity of documents undergoing the signing process. The issue was caused by insufficient authorization validation on referenced resources during request processing.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-4947?

It affects 1 product.


Products: Foxit Esign.

## How do I fix CVE-2026-4947?

No fix has been published for CVE-2026-4947 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4947 being exploited?

There is no known exploitation of CVE-2026-4947 in the wild and no public exploit code.

## Other vulnerabilities in na1.foxitesign.foxit.com

- [CVE-2025-66523](https://insights.sbomify.com/CVE-2025-66523/): Reflected Cross-Site Scripting (XSS) Vulnerability in na1.foxitesign.foxit.com via Unsanitized URL Parameters (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4947 and fix it if it is affected.

What it is: CVE-2026-4947 is a high-severity missing authorization vulnerability in na1.foxitesign.foxit.com, published on 1 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-4947 in the wild and no public exploit code.

Affected product: na1.foxitesign.foxit.com. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-4947/ (Markdown: https://insights.sbomify.com/CVE-2026-4947/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4947
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4947
- OSV: https://osv.dev/vulnerability/CVE-2026-4947

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4947/
Summaries are generated and may contain mistakes; the official description above is the record.