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CVE-2026-55759

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

High7.4EPSS 0.32%
Published
Updated
Reserved
Assigned by
GitHub_M

Description

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.

Scores

CVSS scores of CVE-2026-55759, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)3.1High7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVDNVD · Deferred3.1High7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS (exploitation in 30 days)
0.32% · top 75% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.

Weakness

Affected products

  • RocketChat · Rocket.Chat

    • affected >= 8.5.0-rc.0, < 8.5.1
    • affected >= 8.4.0-rc.0, < 8.4.4
    • affected >= 8.3.0-rc.0, < 8.3.6
    • affected >= 8.2.0-rc.0, < 8.2.6
    • affected >= 8.1.0-rc.0, < 8.1.6
    • affected >= 7.11.0-rc.0, < 8.0.7
    • affected < 7.10.13

References (1)

Sources

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

Badge for a README or a ticket

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Record last updated .