CVE-2026-55759Network attack vector

Account takeover via Apple identity token replay

Published Jun 24, 2026 · Updated Jun 24, 2026

Improper authentication in affected Rocket.Chat releases allows remote attackers to access a user's account with a replayed Apple identity token. The Apple Sign-In handler calls JWS.verify for signature verification but does not validate the token's issuer, audience, expiration, not-before time, or nonce. Exploitation requires possession of an Apple-signed identity token, after which the token remains replayable against the associated account.

CVSS severity7.4
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in affected Rocket.Chat releases allows remote attackers to access a user's account with a replayed Apple identity token. The Apple Sign-In handler calls JWS.verify for signature verification but does not validate the token's issuer, audience, expiration, not-before time, or nonce. Exploitation requires possession of an Apple-signed identity token, after which the token remains replayable against the associated account.

The record

CVE
CVE-2026-55759
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
Rocket.Chat Technologies Corp.
Product
Rocket.Chat
Classifications
CWE-294, CWE-287, T1550.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 7.10.13
  2. Affected versionversion=>= 7.11.0-rc.0, < 8.0.7
  3. Affected versionversion=>= 8.1.0-rc.0, < 8.1.6
  4. Affected versionversion=>= 8.2.0-rc.0, < 8.2.6
  5. Affected versionversion=>= 8.3.0-rc.0, < 8.3.6
  6. Affected versionversion=>= 8.4.0-rc.0, < 8.4.4
  7. Affected versionversion=>= 8.5.0-rc.0, < 8.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rocket.Chat Technologies Corp. · Rocket.Chatversion=< 7.10.13; version=>= 7.11.0-rc.0, < 8.0.7; version=>= 8.1.0-rc.0, < 8.1.6; version=>= 8.2.0-rc.0, < 8.2.6; version=>= 8.3.0-rc.0, < 8.3.6; version=>= 8.4.0-rc.0, < 8.4.4; version=>= 8.5.0-rc.0, < 8.5.1

Published CVSS scores

7.4GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-294Authentication Bypass by Capture-replay
CWE-287Improper Authentication
T1550.001Application Access Token

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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