Mattermost with Jira plugin enabled has Incorrect Implementation of Authentication Algorithm

Description

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 with the Jira plugin enabled and Mattermost Jira plugin versions <=4.4.0 fail to enforce authentication and issue-key path restrictions in the Jira plugin, which allows an unauthenticated attacker who knows a valid user ID to issue authenticated GET and POST requests to the Jira server via crafted plugin payloads that spoof the user ID and inject arbitrary issue key paths. Mattermost Advisory ID: MMSA-2025-00555

Basic information

Type
reviewed
Severity
high
Advisory on GitHub
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Repository advisory
Source code
Browse source ↗
Published (advisory)
2025-12-22 12:30:21 UTC
Updated
2026-01-02 15:34:11 UTC
GitHub reviewed
2026-01-02 15:34:07 UTC
NVD published
2025-12-22

EPSS Score

Score Percentile
0.12% 31.23%

CVSS Scores

Base score Version Severity Vector
7.2 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.

Identifiers

CWEs

CWE id Name
CWE-303 Incorrect Implementation of Authentication Algorithm

Affected packages (2)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
go github.com/mattermost/mattermost/server/v8 < 8.0.0-20251121122154-b57c297c6d7a 8.0.0-20251121122154-b57c297c6d7a
go github.com/mattermost/mattermost-plugin-jira < 4.4.1 4.4.1

References

cvelogic Threat Intelligence