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TI-2026-40248 Aliases CVE-2026-55759

Rocket.Chat: Apple Sign-In skips JWT claims validation, allowing expired and cross-audience token replay

Priority LOW 34CWE-287Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, and 7.10.13, Rocket.Chat's Apple Sign-In handler verifies JWT signatures but skips claims validation. Any Apple-signed JWT with a non-empty iss is accepted regardless of aud, exp, nbf, or nonce. An attacker who obtains a target user's Apple identity token (from server logs, an intercepted sign-in flow, or another application sharing the same Apple developer team) can replay it to authenticate as that user, with no expiration on the replay window. This vulnerability is fixed in 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, and 7.10.13.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00323 25th percentileScored 2026-11-07
Fix Fixed Rocket.Chat (RocketChat): 8.5.1, 8.4.4, 8.3.6 +4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
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 8.5.1; 8.4.0-rc.0 to before 8.4.4; 8.3.0-rc.0 to before 8.3.6; 8.2.0-rc.0 to before 8.2.6; 8.1.0-rc.0 to before 8.1.6; 7.11.0-rc.0 to before 8.0.7; before 7.10.138.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, 7.10.13Patch availableCNA
  • Rocket.Chat VendorRocketChat Affected 8.5.0-rc.0 to before 8.5.1; 8.4.0-rc.0 to before 8.4.4; 8.3.0-rc.0 to before 8.3.6; 8.2.0-rc.0 to before 8.2.6; 8.1.0-rc.0 to before 8.1.6; 7.11.0-rc.0 to before 8.0.7; before 7.10.13 Fixed in 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, 7.10.13 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 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, 7.10.13

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55759

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