How severe is GHSA-86jg-35xj-3vv5?

GHSA-86jg-35xj-3vv5 has a CVSS score of 3.1/10, rated LOW. Review your exposure and patch according to your risk tolerance.

Which packages are affected by GHSA-86jg-35xj-3vv5?

GHSA-86jg-35xj-3vv5 affects the following packages: github.com/mattermost/mattermost/server/v8 (Go), github.com/mattermost/mattermost/server/v8 (Go), github.com/mattermost/mattermost/server/v8 (Go), github.com/mattermost/mattermost/server/v8 (Go). Ecosystems affected: Go.

How do I fix GHSA-86jg-35xj-3vv5?

Update github.com/mattermost/mattermost/server/v8 to 10.7.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-86jg-35xj-3vv5 is resolved across your whole dependency graph.

How do I detect GHSA-86jg-35xj-3vv5 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/mattermost/mattermost/server/v8, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-86jg-35xj-3vv5 if there is no patch (or I can't update yet)?

Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Is GHSA-86jg-35xj-3vv5 actively exploited in the wild?

No public exploit code has been indexed for GHSA-86jg-35xj-3vv5 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-86jg-35xj-3vv5?

GHSA-86jg-35xj-3vv5 has an EPSS (Exploit Prediction Scoring System) score of 0.2%, placing it in the 14th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-86jg-35xj-3vv5?

GHSA-86jg-35xj-3vv5 is classified as CWE-863 (CWE-863). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-86jg-35xj-3vv5 published, and has it been updated?

GHSA-86jg-35xj-3vv5 was published on May 30, 2025 and was last updated on August 7, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹

🐹 Go

Not in CISA KEV

LOW severity

Mattermost fails to properly enforce access control restrictions for System Manager rolesGHSA-86jg-35xj-3vv5

LOWFix: mattermost/mattermost@6f33b72

GHSA-86jg-35xj-3vv5 is a low-severity (CVSS 3.1) CWE-863 vulnerability in github.com/mattermost/mattermost/server/v8. A fix is available for github.com/mattermost/mattermost/server/v8 — see the affected versions and patch details below.

Also known asCVE-2025-3611GO-2025-3728

Published

May 30, 2025

Updated

Aug 7, 2026

Affected

4 pkgs

Patched

4 / 4

Exploits

None indexed

Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-86jg-35xj-3vv5.

EPSS Exploitation Probability

via FIRST.org ↗

0.2%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs14th percentile — riskier than 14% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

4 pkgs affected

🐹github.com/mattermost/mattermost/server/v8🐹github.com/mattermost/mattermost/server/v8🐹github.com/mattermost/mattermost/server/v8🐹github.com/mattermost/mattermost/server/v8

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Mattermost versions 10.7.x <= 10.7.0, 10.5.x <= 10.5.3, 9.11.x <= 9.11.12 fails to properly enforce access control restrictions for System Manager roles, allowing authenticated users with System Manager privileges to view team details they should not have access to via direct API requests to team endpoints, even when explicitly configured with 'No access' to Teams in the System Console.

Affected Packages

4 total 4 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/mattermost/mattermost/server/v8`	≥ 10.6.0-rc1&&< 10.7.1	10.7.1`go get github.com/mattermost/mattermost/server/v8@v10.7.1`
🐹Go	`github.com/mattermost/mattermost/server/v8`	≥ 10.0.0-rc1&&< 10.5.4	10.5.4`go get github.com/mattermost/mattermost/server/v8@v10.5.4`
🐹Go	`github.com/mattermost/mattermost/server/v8`	≥ 9.0.0-rc1&&< 9.11.13	9.11.13`go get github.com/mattermost/mattermost/server/v8@v9.11.13`
🐹Go	`github.com/mattermost/mattermost/server/v8`	all versions	8.0.0-20250414154356-6f33b721de76`go get github.com/mattermost/mattermost/server/v8@v8.0.0-20250414154356-6f33b721de76`

Affected Products

1 product · 5 configurations

Application

mattermost servermattermost

≥ 10.5.0 && < 10.5.4

1 version

10.7.0

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/mattermost/mattermost/server/v8, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/mattermost/mattermost/server/v8 to 10.7.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-86jg-35xj-3vv5 is resolved across your whole dependency graph.
Workarounds
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is GHSA-86jg-35xj-3vv5 in your dependencies?

Find it across Go, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

3.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Raw vector

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

CWE Classification

CWE-863CWE-863

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

OpenSSF Scorecard

Package health score

mattermost

7.3/10

Code-Review10/10

Maintained10/10

Dependency-Update-Tool10/10

Branch-Protection4/10

Vulnerabilities0/10

Assessed Nov 10, 2026

Timeline

Disclosed

May 30, 2025

Last updated

Aug 7, 2026

Identifiers

GHSA-86jg-35xj-3vv5

GO-2025-3728

References

Advisorynvd.nist.gov · CVE 2025 3611 Webgithub.com · 6f33b721de76b39a7714bfe0d5e9c1306869a3e3 Webmattermost.com · security updates Packagegithub.com · mattermost

Related vulnerabilities

This CVE is low severity; 8 of 8 other CVEs affecting v8 are rated as high or higher (top: high).

CVE-2026-8823CVE-2026-6046CVE-2026-7387CVE-2026-6961CVE-2026-7184CVE-2026-6689CVE-2026-6739CVE-2026-3433

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedAug 7, 2026

Mattermost fails to properly enforce access control restrictions for System Manager rolesGHSA-86jg-35xj-3vv5

Exploitation Status

No confirmed exploitation observed yet

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is GHSA-86jg-35xj-3vv5 in your dependencies?