Is CVE-2025-13870 in the CISA KEV catalog?

No. CVE-2025-13870 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-13870?

CVE-2025-13870 has a CVSS v3 base score of 3.1 (LOW).

What is the EPSS score for CVE-2025-13870?

CVE-2025-13870 has an EPSS score of 0.19% (9th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-13870?

Upgrade mattermost server to 10.11.5 or later.

CVE & CISA-KEV Catalog

CVE-2025-13870

LOW

3.1

CVSS v3

NVD

Description

Mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to

CWE-306Missing Authentication for Critical Function

How to fix

Remediation Available

mattermost serverNVD

Affected:>= 10.11.0, < 10.11.5Fixed in:10.11.5CVE-2025-13870derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.19%probability of exploitation in 30 days

9thpercentile

Low risk: more likely to be exploited than 9% of all known CVEs.

References

Vendor Advisory1

mattermost.com

Related Vulnerabilities

Other CWE-306 (Missing Authentication for Critical Function) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-10271	High	7.5	100%	KEV + Ransom	-
CVE-2023-42793	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2025-3248	Critical	9.8	100%	KEV	Fix
CVE-2022-1388	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2021-37415	Critical	9.8	100%	KEV	-
CVE-2023-21839	High	7.5	100%	KEV	-

Embed a live status badge for CVE-2025-13870

Markdown

[![CVE-2025-13870](https://tridentstack.com/cve/badge/CVE-2025-13870.svg)](https://tridentstack.com/cve/CVE-2025-13870)

HTML

<a href="https://tridentstack.com/cve/CVE-2025-13870"><img src="https://tridentstack.com/cve/badge/CVE-2025-13870.svg" alt="CVE-2025-13870"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-12-03.