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CVE-2026-46423

Rocket.Chat: SAML signature validation skipped when IdP certificate field is empty

Critical9.3EPSS 0.22%
Published
Updated
Reserved
Assigned by
GitHub_M

Description

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.

Scores

CVSS scores of CVE-2026-46423, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)4.0Critical9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
NVDNVD · Deferred4.0Critical9.3CVSS: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
EPSS (exploitation in 30 days)
0.22% · top 87% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.3.

Weakness

Affected products

  • RocketChat · Rocket.Chat

    • affected >= 8.5.0-rc.0, < 8.5.0
    • affected >= 8.4.0-rc.0, < 8.4.1
    • affected >= 8.3.0-rc.0, < 8.3.3
    • affected >= 8.2.0-rc.0, < 8.2.3
    • affected >= 8.1.0-rc.0, < 8.1.4
    • affected >= 8.0.0-rc.0, < 8.0.5
    • affected >= 7.11.0-rc.0, < 7.13.7
    • affected < 7.10.11

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .