EUVD-2026-39095Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable, low-complexity, unauthenticated SAML signature bypass enabling full identity/account takeover, so PR:N with high confidentiality and integrity and limited availability impact.
Primary rating from Vendor (github).
CVSS VectorVendor: github
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11, Rocket.Chat's SAML service provider implementation silently skips both SAML Response and Assertion signature validation when the configured IdP certificate field is empty. The verifySignatures routine performs an early return when serviceProviderOptions.cert is falsy, which is the default state of the setting. Because provider registration only gates on the SAML "enabled" toggle and not on the presence of a certificate, an administrator who enables SAML without pasting an IdP certificate obtains a fully wired, publicly reachable SAML login endpoint that accepts unsigned or attacker-supplied assertions. This is a default-configuration authentication-bypass class: the fail-open branch is reached with no misconfiguration beyond leaving a field at its shipped default. This vulnerability is fixed in 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11.
AnalysisAI
Authentication bypass in Rocket.Chat's SAML service provider lets attackers log in as arbitrary users when SAML is enabled but the IdP certificate field is left at its empty shipped default, which causes signature validation to be silently skipped. All versions prior to 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11 are affected, and the CVSS 4.0 base score is 9.3 (Critical). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that SAML single sign-on is enabled in Rocket.Chat AND that the IdP certificate field is empty - the latter being the shipped default state of the setting, so no active misconfiguration is needed beyond turning SAML on. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The supplied CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L) scores 9.3 Critical and is consistent with the description: a network-reachable, unauthenticated, low-complexity authentication bypass yielding high confidentiality and integrity impact (full account/identity takeover) and limited availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker discovers a Rocket.Chat instance with SAML enabled but no IdP certificate configured (the default) and sends a crafted, unsigned SAML assertion to the SAML login endpoint asserting the identity of a target user, such as an administrator. Because signature validation is skipped, Rocket.Chat accepts the forged assertion and grants an authenticated session as that user. … |
| Remediation | Vendor-released patch: upgrade to the fixed release for your branch - 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, or 7.10.11 (choose the patched version matching your current major/minor line) per advisory GHSA-rgg7-qvp9-wvx7 (https://github.com/RocketChat/Rocket.Chat/security/advisories/GHSA-rgg7-qvp9-wvx7). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Verify your Rocket.Chat version and audit SAML configuration to confirm whether the identity provider certificate field is populated (empty indicates vulnerability). …
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External POC / Exploit Code
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