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01 Record

CVE-2026-55666

Rocket.Chat: Email Parameter Fallback Leads To Account Takeover Within Apple OAuth

CriticalPUBLISHEDCNA: GitHub_M
CNA base score9.3 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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02 Description

Rocket.Chat: Email Parameter Fallback Leads To Account Takeover Within Apple OAuth

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.40% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 34.5% of scored records. A rank, not a probability.
NVD base score
9.3 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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
NVD analysis status
Deferred. NVD last modified this record on 2026-10-25.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-06-24 21:06Z4 MO AGO
Last updated
2026-06-29 15:34Z4 MO AGO
Reserved
2026-06-17
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Critical (CVSS 9.3)
CNA CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weaknesses
  • CWE-287Improper AuthenticationClass
  • CWE-288Authentication Bypass Using an Alternate Path or ChannelBase
Data version
5.2
Document digest
34eac0642bf9c552938f675913be9358af9d68de9d8f129b0e78d99a4a0f4cc2

05 Affected products

VendorProductVersionsPlatforms
RocketChatRocket.Chat>= 8.5.0-rc.0, < 8.5.1, >= 8.4.0-rc.0, < 8.4.4, >= 8.3.0-rc.0, < 8.3.6, >= 8.2.0-rc.0, < 8.2.6, >= 8.1.0-rc.0, < 8.1.6, >= 7.11.0-rc.0, < 8.0.7, < 7.10.13—

06 References