CVE-2026-46423Network attack vector

Unauthenticated account impersonation via skipped SAML signatures

Published Jun 24, 2026 · Updated Jun 24, 2026

Authentication bypass in Rocket.Chat allows remote attackers to impersonate any mapped user through unsigned SAML assertions. The SAML Response.verifySignatures routine returns when serviceProviderOptions.cert is empty, so neither Response nor Assertion signatures are checked before a session is issued. Reachability requires SAML to be enabled with the certificate field left at its shipped empty default; successful exploitation grants the targeted user's workspace access and can yield tenant control when an administrator is impersonated.

CVSS severity9.3
Critical
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Rocket.Chat allows remote attackers to impersonate any mapped user through unsigned SAML assertions. The SAML Response.verifySignatures routine returns when serviceProviderOptions.cert is empty, so neither Response nor Assertion signatures are checked before a session is issued. Reachability requires SAML to be enabled with the certificate field left at its shipped empty default; successful exploitation grants the targeted user's workspace access and can yield tenant control when an administrator is impersonated.

The record

CVE
CVE-2026-46423
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
Rocket.Chat Technologies Corp.
Product
Rocket.Chat
Classifications
CWE-347, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 7.10.11
  2. Affected versionversion=>= 7.11.0-rc.0, < 7.13.7
  3. Affected versionversion=>= 8.0.0-rc.0, < 8.0.5
  4. Affected versionversion=>= 8.1.0-rc.0, < 8.1.4
  5. Affected versionversion=>= 8.2.0-rc.0, < 8.2.3
  6. Affected versionversion=>= 8.3.0-rc.0, < 8.3.3
  7. Affected versionversion=>= 8.4.0-rc.0, < 8.4.1
  8. Affected versionversion=>= 8.5.0-rc.0, < 8.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rocket.Chat Technologies Corp. · Rocket.Chatversion=< 7.10.11; version=>= 7.11.0-rc.0, < 7.13.7; version=>= 8.0.0-rc.0, < 8.0.5; version=>= 8.1.0-rc.0, < 8.1.4; version=>= 8.2.0-rc.0, < 8.2.3; version=>= 8.3.0-rc.0, < 8.3.3; version=>= 8.4.0-rc.0, < 8.4.1; version=>= 8.5.0-rc.0, < 8.5.0

Published CVSS scores

9.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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