# CVE-2023-2876: Session cookie exposure for client side script

> Attackers can steal session cookies via XSS due to missing HttpOnly flags, potentially leading to account takeover on ABB REX640 relays.

- **Severity:** Low 3.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 13 Jun 2023
- **Updated:** 3 Jan 2025
- **Also known as:** GHSA-xxww-73xw-x3fj

## What is CVE-2023-2876?

CVE-2023-2876 is a low-severity cross-site scripting vulnerability in ABB REX640 PCL1, published on 13 Jun 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Sensitive Cookie Without 'HttpOnly' Flag vulnerability in ABB REX640 PCL1 (firmware modules), ABB REX640 PCL2 (Firmware modules), ABB REX640 PCL3 (firmware modules) allows Cross-Site Scripting (XSS).This issue affects REX640 PCL1: from 1.0;0 before 1.0.8; REX640 PCL2: from 1.0;0 before 1.1.4; REX640 PCL3: from 1.0;0 before 1.2.1.

Weakness: CWE-732 (Incorrect Permission Assignment for Critical Resource), CWE-1004 (Sensitive Cookie Without 'HttpOnly' Flag)

## Which versions are affected by CVE-2023-2876?

It affects 3 products.


Products: Abb Rex640 Pcl1 Firmware, Abb Rex640 Pcl2 Firmware, Abb Rex640 Pcl3 Firmware.

## How do I fix CVE-2023-2876?

No fix has been published for CVE-2023-2876 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-2876 being exploited?

There is no known exploitation of CVE-2023-2876 in the wild and no public exploit code.

## Other vulnerabilities in ABB REX640 PCL1

- [CVE-2022-1596](https://insights.sbomify.com/CVE-2022-1596/): ABB Relion REX640 Insufficient file access control (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-2876 and fix it if it is affected.

What it is: CVE-2023-2876 is a low-severity cross-site scripting vulnerability in ABB REX640 PCL1, published on 13 Jun 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-2876 in the wild and no public exploit code.

Affected product: ABB REX640 PCL1. 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-2023-2876/ (Markdown: https://insights.sbomify.com/CVE-2023-2876/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-2876
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-2876
- OSV: https://osv.dev/vulnerability/CVE-2023-2876

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-2876/
Summaries are generated and may contain mistakes; the official description above is the record.