5.9

CVSS Score

3.1

-

CVSS Score

Basic Information

Concerned about an active attack path?

Talk to our security experts and see Miggo in action.

Miggo Vulnerability Database

→

CVE-2025-53514

CVE-2025-53514: Mattermost Confluence Plugin has Improper Check for Unusual or Exceptional Conditions

Mattermost Confluence Plugin versions < 1.5.0 fail to handle unexpected request bodies, allow\ing attackers to crash the plugin via constant hits to the server webhook endpoint with an invalid request body.

(GitHub Advisory)

Miggo Vulnerability Database

→

CVE-2025-53514

CVE-2025-53514:

5.9

CVSS Score

3.1

-

CVSS Score

Basic Information

Is this CVE running in your environment?

Easily map the attack path and prioritize which CVEs are a threat to your organization

Validate Exposure

Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/mattermost/mattermost-plugin-confluence	go	< 1.5.0	1.5.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability lies in the Mattermost Confluence Plugin's handling of webhook requests. An attacker could send a specially crafted or malformed JSON payload to the webhook endpoint, causing the plugin to panic and crash. This denial-of-service vulnerability is due to two main issues:

Unhandled Deserialization Errors: The primary webhook handler, handleConfluenceServerWebhook, did not properly handle errors during JSON deserialization. The function serializer.ConfluenceServerEventFromJSON would not propagate errors, leading to the processing of incomplete or nil data structures, which would cause a panic.
Missing Nil Checks: Even if the JSON was syntactically valid, it could be missing expected fields or objects. Several functions that process the event data, such as notification.extractSpaceKeyAndPageID and ConfluenceServerEvent.GetNotificationPost, did not perform necessary nil checks before accessing nested fields. This would lead to nil pointer dereference panics.

The patches address these issues by:

Modifying serializer.ConfluenceServerEventFromJSON to return an error on deserialization failure and updating handleConfluenceServerWebhook to check for this error.
Adding explicit nil checks in various functions that process the event data to ensure that potentially missing fields are handled gracefully without causing a panic.

By identifying these functions, security engineers can understand the root cause of the vulnerability and verify that the patch has been applied in their environment by observing the presence of the new error and nil-checking logic.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

Vulnerability Intelligence
Miggo AI

Unlock WAF rules for this CVE

Generate vendor-ready rules for the observed attack patterns, plus reasoning and safe deployment guidance

Get WAF rules

WAF Protection Rules

WAF Rule

W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.

Reasoning

*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.