# CVE-2026-22560: Rocket.Chat open redirect in SAML SLO endpoint

Source: https://junglewise.ai/threats/cve-2026-22560-rocket-chat-open-redirect-in-saml-slo-endpoint  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-10. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2026-22560 · Severity: medium · CVSS 5.3 · Published 2026-04-10

Rocket.Chat is a communication platform used for team collaboration and messaging. A security flaw in its login integration system allows attackers to redirect users to malicious external websites. This could be used in phishing campaigns to trick employees into providing credentials or downloading malware by making a malicious link appear to be a legitimate part of the company's chat service.

Technologies: [Rocket.Chat](https://junglewise.ai/threats/technologies/rocket-chat). Vendors: [Rocket.Chat](https://junglewise.ai/threats/vendors/rocket-chat).

## Quick answers

**Is CVE-2026-22560 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-22560 being exploited in the wild.

**How severe is CVE-2026-22560?** Medium severity, with a CVSS score of 5.3, published 10 April 2026.

**Which products and versions are affected?** Rocket.Chat Rocket.Chat < 8.4.0.

**Is there a fix for CVE-2026-22560?** A patch was published on 2026-03-26: Fix merged into development branch Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-22560 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-22560?** Check whether you run Rocket.Chat. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An open redirect vulnerability (CWE-601) exists in Rocket.Chat's SAML Single Logout (SLO) implementation. The 'processSLORedirectAction' function failed to validate the 'redirect' query parameter, allowing unauthenticated remote attackers to craft URLs that redirect users to arbitrary external domains. The vulnerability is specifically located at the '/_saml/sloRedirect/' endpoint. Attackers can exploit this by appending a malicious URL to the redirect parameter. The fix, introduced in version 8.4.0, implements strict origin and pathname matching against the configured Identity Provider (IdP) SLO service endpoint to ensure redirects only occur to authorized destinations.

## Affected products

- Rocket.Chat Rocket.Chat < 8.4.0

## Timeline

- 2026-02-24: other: Fix proposed in GitHub pull request
- 2026-03-26: patched: Fix merged into development branch
- 2026-04-10: disclosed: Initial disclosure via HackerOne and NVD

## References

- [https://github.com/RocketChat/Rocket.Chat/pull/38994](https://github.com/RocketChat/Rocket.Chat/pull/38994)
- [https://hackerone.com/reports/3418031](https://hackerone.com/reports/3418031)

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