Skip to content
Noroxi
CVE-2026-4646· NVD / CVE Program· CNA Mattermost

Insufficient input validation in GitHub plugin API causes denial of service

Noroxi assessment

Priority: Monitor (action score 17/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.43% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: github.com/mattermost/mattermost-plugin-github (Go) 1.0.1-0.20260330164815-c2840e980b3c; github.com/mattermost/mattermost-server (Go) 10.11.15, 10.11.15+incompatible, 11.4.5.

Low priority for now. Upgrade to github.com/mattermost/mattermost-plugin-github (Go) 1.0.1-0.20260330164815-c2840e980b3c; github.com/mattermost/mattermost-server (Go) 10.11.15, 10.11.15+incompatible, 11.4.5 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate user-supplied input in API request handlers which allows an authenticated attacker to crash the plugin process via a crafted HTTP request to the PR details endpoint.. Mattermost Advisory ID: MMSA-2026-00638

MediumCVSS 4.3 · v3.1—No exploit Fix available
Published
May 22, 2026
Updated
Jul 23, 2026
EPSS
0.4% · 35th percentile

Report tools

JSON

Action score

17

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Mattermost
4.3
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-4646

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for mattermost records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mattermostmattermost server

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mattermost mattermost server10.11.0 and later · before 10.11.15
  • mattermost mattermost server11.4.0 and later · before 11.4.5
  • mattermost mattermost server11.5.0 and later · before 11.5.4
  • mattermost mattermost server11.6.0 and later · before 11.6.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Mattermost). Independent of NVD's CPE analysis and usually ahead of it.

  • Mattermost Mattermost

    • 11.7.0, 11.6.1, 11.5.4, 11.4.5, 10.11.15not affected
    • 11.6.0 and later · up to and including 11.6.0affected · semver
    • 11.5.0 and later · up to and including 11.5.3affected · semver
    • 11.4.0 and later · up to and including 11.4.4affected · semver
    • 10.11.0 and later · up to and including 10.11.14affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Gogithub.com/mattermost/mattermost-plugin-githubbefore 1.0.1-0.20260330164815-c2840e980b3c1.0.1-0.20260330164815-c2840e980b3c
Gogithub.com/mattermost/mattermost-serverfrom 10.11.0 · before 10.11.1510.11.15
Gogithub.com/mattermost/mattermost-serverfrom 10.11.0+incompatible · before 10.11.15+incompatible10.11.15+incompatible
Gogithub.com/mattermost/mattermost-serverfrom 11.4.0 · before 11.4.511.4.5
Gogithub.com/mattermost/mattermost-serverfrom 11.4.0+incompatible · before 11.4.5+incompatible11.4.5+incompatible
Gogithub.com/mattermost/mattermost-serverfrom 11.5.0 · before 11.5.411.5.4
Gogithub.com/mattermost/mattermost-serverfrom 11.5.0+incompatible · before 11.5.4+incompatible11.5.4+incompatible
Gogithub.com/mattermost/mattermost-serverfrom 11.6.0 · before 11.6.111.6.1
Gogithub.com/mattermost/mattermost-serverfrom 11.6.0+incompatible · before 11.6.1+incompatible11.6.1+incompatible

Same product

mattermost: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-4858Path traversal in integration action URL leading to arbitrary API execution via system admin’s auth token.
    39Monitor
  • CVE-2025-12421Account Takeover via Code Exchange Endpoint
    39Monitor
  • CVE-2025-12419Account takeover on OAuth/OpenID-enabled servers
    39Monitor
  • CVE-2025-4981Path Traversal Leading to RCE by Any Authenticated Mattermost User
    39Monitor
  • CVE-2023-6458Client side path traversal due to lack of route parameters validation
    39Monitor
  • CVE-2017-18920An issue was discovered in Mattermost Server before 3.6.2.
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Go:github.com/mattermost/mattermost-plugin-github1.0.1-0.20260330164815-c2840e980b3cPackage registry (OSV)
Go:github.com/mattermost/mattermost-server10.11.15Package registry (OSV)
Go:github.com/mattermost/mattermost-server10.11.15+incompatiblePackage registry (OSV)
Go:github.com/mattermost/mattermost-server11.4.5Package registry (OSV)
Go:github.com/mattermost/mattermost-server11.4.5+incompatiblePackage registry (OSV)
Go:github.com/mattermost/mattermost-server11.5.4Package registry (OSV)
Go:github.com/mattermost/mattermost-server11.5.4+incompatiblePackage registry (OSV)
Go:github.com/mattermost/mattermost-server11.6.1Package registry (OSV)
Go:github.com/mattermost/mattermost-server11.6.1+incompatiblePackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-245467 days apartDoS in Calls plugin via malformed msgpack in websocket request.
    34Monitor
  • CVE-2025-41395393 days apartWebapp DoS via malicious retrospective post in Playbooks
    30Monitor
  • CVE-2025-20621491 days apartWebapp crash via object that can't be cast to String in Attachment Field
    30Monitor
  • CVE-2025-12689156 days apartDoS in Calls plugin via malformed UTF-8 in WebSocket request
    26Monitor
  • CVE-2025-20086492 days apartInsufficient Input Validation on Post Props
    26Monitor
  • CVE-2025-20088492 days apartInsufficient Input Validation on Post Props
    26Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
low · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
Low

Weakness class (CWE)

CWE-1287 · Improper Validation of Specified Type of Input

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records