CVE-2026-28741 | Mattermost up to 10.11.12/11.3.2/11.4.2/11.5.0 cross-site request forgery

VDB-357716 · CVE-2026-28741 · GCVE-0-2026-28741 MATTERMOST UP TO 10.11.12/11.3.2/11.4.2/11.5.0 CROSS-SITE REQUEST FORGERY HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.4 $0-$5k 3.73 Summaryinfo A vulnerability, which was classified as problematic, was found in Mattermost up to 10.11.12/11.3.2/11.4.2/11.5.0. The impacted element is an unknown function. Such manipulation leads to cross-site request forgery. This vulnerability is documented as CVE-2026-28741. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component. Detailsinfo A vulnerability, which was classified as problematic, has been found in Mattermost up to 10.11.12/11.3.2/11.4.2/11.5.0. Affected by this issue is some unknown functionality. The manipulation with an unknown input leads to a cross-site request forgery vulnerability. Using CWE to declare the problem leads to CWE-352. The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request. Impacted is integrity. CVE summarizes: Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to validate CSRF tokens on an authentication endpoint which allows an attacker to update a user's authentication method via a CSRF attack by tricking a user into visiting a malicious page. Mattermost Advisory ID: MMSA-2026-00625 The weakness was released by Eva Sarafianou. The advisory is shared for download at mattermost.com. This vulnerability is handled as CVE-2026-28741 since 03/10/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. Upgrading to version 10.11.13, 11.3.3, 11.4.3 or 11.5.1 eliminates this vulnerability. Productinfo Type Groupware Software Name Mattermost Version 10.11.0 10.11.1 10.11.2 10.11.3 10.11.4 10.11.5 10.11.6 10.11.7 10.11.8 10.11.9 10.11.10 10.11.11 10.11.12 11.0 11.1 11.2 11.3 11.3.0 11.3.1 11.3.2 11.4 11.4.0 11.4.1 11.4.2 11.5.0 License open-source CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.5 VulDB Meta Temp Score: 5.4 VulDB Base Score: 4.3 VulDB Temp Score: 4.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 6.8 CNA Vector (Mattermost): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Cross-site request forgery CWE: CWE-352 / CWE-862 / CWE-863 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Mattermost 10.11.13/11.3.3/11.4.3/11.5.1 Timelineinfo 03/10/2026 CVE reserved 04/15/2026 +35 days Advisory disclosed 04/15/2026 +0 days VulDB entry created 04/15/2026 +0 days VulDB entry last update Sourcesinfo Advisory: mattermost.com Researcher: Eva Sarafianou Status: Confirmed CVE: CVE-2026-28741 (🔒) GCVE (CVE): GCVE-0-2026-28741 GCVE (VulDB): GCVE-100-357716 Entryinfo Created: 04/15/2026 14:03 Changes: 04/15/2026 14:03 (64) Complete: 🔍 Cache ID: 99:29B:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸