VulnSocial

CVE-2026-9571Disclosure(mattermost / mattermost_server)

LOWCVSS 6.5 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to invalidate OAuth refresh tokens upon user account deactivation, which allows a deactivated user or an attacker in possession of a valid refresh token to obtain new functional access tokens via the OAuth refresh token grant endpoint.. Mattermost Advisory ID: MMSA-2026-00680

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0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-305

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • mattermost_server

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Affected systems

Vendors
mattermost
Products
mattermost_server

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-07-13: 1Technical Details · 2026-07-13: 107-13
Signal classification1 categories
Disclosure
1100.0%
Referenced assets1 URL
By indicator
Full discourse1 post
  • CVE@CVEnew
    Disclosure

    CVE-2026-9571 Mattermost versions 11.7.x &lt;= 11.7.2, 11.6.x &lt;= 11.6.4, 10.11.x &lt;= 10.11.19 fail to invalidate OAuth refresh tokens upon user account deactivation, which allows a deact… https://www.cve.org/CVERecord?id=CVE-2026-9571

    Post summary

    The text discloses a token‑invalidity flaw in specific Mattermost releases, detailing affected versions and the vulnerability’s behavior but presenting no evidence of exploitation or remediation.

    00010792
    57.8K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appmattermostmattermost_server---

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