CVE-2026-45677Network attack vector

Unauthenticated session termination via unsigned SAML logout

Published Jun 24, 2026 · Updated Jun 24, 2026

Missing authorization in affected Rocket.Chat 7.x and 8.x releases allows remote attackers to terminate SAML-authenticated user sessions. The SAML service-provider logout endpoint accepts an unsigned LogoutRequest as legitimate and destroys the session identified by its NameID. The attacker needs the victim's SAML NameID, but needs no account or victim interaction; repeated requests can interrupt access for individual users or an entire SAML-enabled workspace.

CVSS severity8.7
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in affected Rocket.Chat 7.x and 8.x releases allows remote attackers to terminate SAML-authenticated user sessions. The SAML service-provider logout endpoint accepts an unsigned LogoutRequest as legitimate and destroys the session identified by its NameID. The attacker needs the victim's SAML NameID, but needs no account or victim interaction; repeated requests can interrupt access for individual users or an entire SAML-enabled workspace.

The record

CVE
CVE-2026-45677
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
Rocket.Chat Technologies Corp.
Product
Rocket.Chat
Classifications
CWE-862, T1499
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

8.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1499Endpoint Denial of Service

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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