# CVE-2026-58066: Auth bypass in Rocket.Chat

> Attackers can bypass SAML authentication in Rocket.Chat by submitting forged identity attributes with a valid signature, allowing them to log in as arbitrary users.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Jul 2026
- **Updated:** 31 Jul 2026
- **Also known as:** GHSA-f3wj-pr2w-q3fm

## What is CVE-2026-58066?

CVE-2026-58066 is a critical authentication bypass vulnerability in Rocket.chat Rocket.chat, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Rocket.Chat's SAML SSO before versions 8.7.0, 8.6.1, 8.5.2, 8.4.5, 8.3.7, 8.2.7, 8.1.7, 8.0.8, and 7.10.14 verified XML signatures but did not bind the validated signature to samlp:Response / saml:Assertion. An attacker could submit a wrapped document carrying forged identity attributes alongside any valid signature made by the trusted IdP certificate, and log in as an arbitrary user.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-58066?

It affects 1 product.


Products: Rocket.chat Rocket.chat.

## How do I fix CVE-2026-58066?

No fix has been published for CVE-2026-58066 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-58066 being exploited?

There is no known exploitation of CVE-2026-58066 in the wild and no public exploit code.

## Other vulnerabilities in Rocket.chat Rocket.chat

- [CVE-2026-29198](https://insights.sbomify.com/CVE-2026-29198/): SQL injection in Rocket.Chat (critical 9.8)
- [CVE-2023-28316](https://insights.sbomify.com/CVE-2023-28316/): Security feature bypass in Rocket.Chat (critical 9.8)
- [CVE-2022-44567](https://insights.sbomify.com/CVE-2022-44567/): Command injection in Rocket.chat - Electron Desktop (critical 9.8)
- [CVE-2021-22910](https://insights.sbomify.com/CVE-2021-22910/): Code injection in Rocket.Chat server (critical 9.8)
- [CVE-2021-22911](https://insights.sbomify.com/CVE-2021-22911/): Code injection in Rocket.Chat server (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-58066 and fix it if it is affected.

What it is: CVE-2026-58066 is a critical authentication bypass vulnerability in Rocket.chat Rocket.chat, published on 30 Jul 2026. 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-2026-58066 in the wild and no public exploit code.

Affected product: Rocket.chat Rocket.chat. 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-2026-58066/ (Markdown: https://insights.sbomify.com/CVE-2026-58066/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-58066
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-58066
- OSV: https://osv.dev/vulnerability/CVE-2026-58066

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-58066/
Summaries are generated and may contain mistakes; the official description above is the record.