CVE-2026-3116 | Mattermost Plugins up to 11.4.x Webhook Endpoint resource consumption

VDB-353695 · CVE-2026-3116 · GCVE-0-2026-3116 MATTERMOST PLUGINS UP TO 11.4.X WEBHOOK ENDPOINT RESOURCE CONSUMPTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 3.7 $0-$5k 2.89+ Summaryinfo A vulnerability classified as problematic has been found in Mattermost Plugins up to 11.4.x. Affected by this issue is some unknown functionality of the component Webhook Endpoint. This manipulation causes resource consumption. This vulnerability is registered as CVE-2026-3116. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component. Detailsinfo A vulnerability has been found in Mattermost Plugins up to 11.4.x and classified as problematic. Affected by this vulnerability is some unknown processing of the component Webhook Endpoint. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. The summary by CVE is: Mattermost Plugins versions <=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming request size which allows an authenticated attacker to cause service disruption via the webhook endpoint. Mattermost Advisory ID: MMSA-2026-00589 The weakness was published by thecybertantrik. It is possible to read the advisory at mattermost.com. This vulnerability is known as CVE-2026-3116 since 02/24/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation requires an enhanced level of successful authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK. Upgrading to version 10.11.12, 11.2.4, 11.3.2, 11.4.1 or 11.5.0 eliminates this vulnerability. Productinfo Type Groupware Software Vendor Mattermost Name Plugins 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 11.0 11.0.0 11.0.1 11.0.2 11.0.3 11.0.4 11.1 11.1.0 11.1.1 11.1.2 11.1.3 11.2 11.2.0 11.2.1 11.2.2 11.2.3 11.3 11.3.0 11.3.1 11.3.2 11.4 11.4.0 License open-source CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 3.8 VulDB Meta Temp Score: 3.7 VulDB Base Score: 2.7 VulDB Temp Score: 2.6 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 4.9 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: Resource consumption CWE: CWE-400 / CWE-404 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: Plugins 10.11.12/11.2.4/11.3.2/11.4.1/11.5.0 Timelineinfo 02/24/2026 CVE reserved 03/26/2026 +30 days Advisory disclosed 03/26/2026 +0 days VulDB entry created 03/26/2026 +0 days VulDB entry last update Sourcesinfo Advisory: mattermost.com Researcher: thecybertantrik Status: Confirmed CVE: CVE-2026-3116 (🔒) GCVE (CVE): GCVE-0-2026-3116 GCVE (VulDB): GCVE-100-353695 Entryinfo Created: 03/26/2026 19:06 Changes: 03/26/2026 19:06 (66) Complete: 🔍 Cache ID: 99:C51:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸