Read the docs
TI-2026-34135 Aliases CVE-2026-46423

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

Priority MEDIUM 47CWE-347Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-347.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00221 12th percentileScored 2026-11-07
Fix Fixed Rocket.Chat (RocketChat): 8.5.0, 8.4.1, 8.3.3 +5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
RocketChatRocket.Chat8.5.0-rc.0 to before 8.5.0; 8.4.0-rc.0 to before 8.4.1; 8.3.0-rc.0 to before 8.3.3; 8.2.0-rc.0 to before 8.2.3; 8.1.0-rc.0 to before 8.1.4; 8.0.0-rc.0 to before 8.0.5; 7.11.0-rc.0 to before 7.13.7; before 7.10.118.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, 7.10.11Patch availableCNA
  • Rocket.Chat VendorRocketChat Affected 8.5.0-rc.0 to before 8.5.0; 8.4.0-rc.0 to before 8.4.1; 8.3.0-rc.0 to before 8.3.3; 8.2.0-rc.0 to before 8.2.3; 8.1.0-rc.0 to before 8.1.4; 8.0.0-rc.0 to before 8.0.5; 7.11.0-rc.0 to before 7.13.7; before 7.10.11 Fixed in 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, 7.10.11 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:*——Rocket.Chat
  • cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:* Versions — — ·Rocket.Chat

Remediation

  • Fix · CNA Rocket.Chat (RocketChat) Fixed in 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, 7.10.11

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-46423

References

Other 1

  • TI-2026-33430 Rocket.Chat: Pre-Auth NoSQL Injection in CAS Login Handler leading to Arbitrary CAS/SAML User Session Hijack CVSS 3.1CRITICAL 9.1
  • TI-2026-33431 Rocket.Chat: Pre-Auth NoSQL Injection in OAuth2 Token Endpoint leading to Arbitrary User ATO CVSS 3.1CRITICAL 9.1
  • TI-2026-18910 Rocket.Chat Unauthorized Access to OAuth App Details CVSS 3.1HIGH 7.7
  • TI-2026-35234 Rocket.Chat: Missing URL protocol sanitization in ImageElement allows javascript: URLs in markdown images CVSS 3.1MEDIUM 4.4
  • TI-2026-22776 Rocket.Chat: Users can login with any password via the EE ddp-streamer-service CVSS 4.0CRITICAL 9.3
  • TI-2026-40188 Rocket.Chat: Email Parameter Fallback Leads To Account Takeover Within Apple OAuth CVSS 4.0CRITICAL 9.3
See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences