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GHSA-hqpj-f3jh-29vxPublished

Mattermost doesn't validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation

Exact source revision recorded 24 Oct 2026 13:19:41 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

osv · GHSA-hqpj-f3jh-29vx

Published

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation which allows an authenticated attacker to bypass token rotation and reuse the original invite token via sending a crafted invite confirmation with a RefreshedToken matching the original token. Mattermost Advisory ID: MMSA-2026-00575

Source published
18 May 2026 09:31:47 UTC
Source modified
25 Jun 2026 23:11:31 UTC
Observed here
24 Oct 2026 13:19:41 UTC
Source terms
GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Publisher rating · LOW

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Sources read 10 Nov 00:29 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current

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