# CVE-2020-4126: Information disclosure in HCL iNotes

> An unauthenticated remote attacker can capture sensitive cookies via HTTP interception, potentially leading to account takeover in HCL iNotes.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Nov 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-qj8p-f375-fv39

## What is CVE-2020-4126?

CVE-2020-4126 is a medium-severity vulnerability in HCL iNotes, published on 30 Nov 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

HCL iNotes is susceptible to a sensitive cookie exposure vulnerability. This can allow an unauthenticated remote attacker to capture the cookie by intercepting its transmission within an http session. Fixes are available in HCL Domino and iNotes versions 10.0.1 FP6 and 11.0.1 FP2 and later.

Weakness: CWE-311 (Missing Encryption of Sensitive Data)

## Which versions are affected by CVE-2020-4126?

It affects 1 product.


Products: Hcltech Hcl Inotes.

## How do I fix CVE-2020-4126?

No fix has been published for CVE-2020-4126 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-4126 being exploited?

There is no known exploitation of CVE-2020-4126 in the wild and no public exploit code.

## Other vulnerabilities in HCL iNotes

- [CVE-2020-14225](https://insights.sbomify.com/CVE-2020-14225/): Cross-site scripting in HCL iNotes (medium 6.5)
- [CVE-2020-14271](https://insights.sbomify.com/CVE-2020-14271/): Cross-site scripting in HCL iNotes (medium 6.1)
- [CVE-2021-27760](https://insights.sbomify.com/CVE-2021-27760/): HCL Notes 11.0 - 11.0.1 FP4 Sametime Embedded chat clients are vulnerable to group chats loading script on restart (medium 4.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-4126 and fix it if it is affected.

What it is: CVE-2020-4126 is a medium-severity vulnerability in HCL iNotes, published on 30 Nov 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-4126 in the wild and no public exploit code.

Affected product: HCL iNotes. 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-2020-4126/ (Markdown: https://insights.sbomify.com/CVE-2020-4126/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-4126
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-4126
- OSV: https://osv.dev/vulnerability/CVE-2020-4126

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-4126/
Summaries are generated and may contain mistakes; the official description above is the record.