# CVE-2026-27954: LiveHelperChat has department-level authorization bypass in holdaction, blockuser, and transferchat endpoints

> Operators can hold, block, or transfer chats in unauthorized departments due to missing access checks, enabling horizontal privilege escalation.

- **Severity:** Medium 4.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U`)
- **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:** 26 Feb 2026
- **Updated:** 26 Feb 2026
- **Also known as:** GHSA-87wc-2p86-h3w7

## What is CVE-2026-27954?

CVE-2026-27954 is a medium-severity missing authorization vulnerability in livehelperchat, published on 26 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Live Helper Chat is an open-source application that enables live support websites. In versions up to and including 4.52, three chat action endpoints  (holdaction.php, blockuser.php, and transferchat.php) load chat objects by ID without calling `erLhcoreClassChat::hasAccessToRead()`, allowing operators to act on chats in departments they are not assigned to. Operators with the relevant role permissions (holduse, allowblockusers, allowtransfer) can hold, block users from, or transfer chats in departments they are not assigned to. This is a horizontal privilege escalation within one organization. As of time of publication, no known patched versions are available.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-27954?

It affects 1 product.


Products: Livehelperchat Live Helper Chat.

## How do I fix CVE-2026-27954?

No fix has been published for CVE-2026-27954 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-27954 being exploited?

There is no known exploitation of CVE-2026-27954 in the wild and no public exploit code.

## Other vulnerabilities in livehelperchat

- [CVE-2024-27516](https://insights.sbomify.com/CVE-2024-27516/): livehelperchat Server-Side Template Injection (critical 9.8)
- [CVE-2022-0935](https://insights.sbomify.com/CVE-2022-0935/): Host Header injection in password Reset in livehelperchat/livehelperchat (high 8.8)
- [CVE-2022-1234](https://insights.sbomify.com/CVE-2022-1234/): XSS in livehelperchat in livehelperchat/livehelperchat (high 8.8)
- [CVE-2022-1191](https://insights.sbomify.com/CVE-2022-1191/): SSRF on index.php/cobrowse/proxycss/ in livehelperchat/livehelperchat (high 8.7)
- [CVE-2022-1213](https://insights.sbomify.com/CVE-2022-1213/): SSRF filter bypass port 80, 433 in livehelperchat/livehelperchat (high 7.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27954 and fix it if it is affected.

What it is: CVE-2026-27954 is a medium-severity missing authorization vulnerability in livehelperchat, published on 26 Feb 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-2026-27954 in the wild and no public exploit code.

Affected product: livehelperchat. 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-2026-27954/ (Markdown: https://insights.sbomify.com/CVE-2026-27954/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27954
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27954
- OSV: https://osv.dev/vulnerability/CVE-2026-27954

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27954/
Summaries are generated and may contain mistakes; the official description above is the record.