Is CVE-2026-25780 in the CISA KEV catalog?

No. CVE-2026-25780 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-25780?

CVE-2026-25780 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2026-25780?

CVE-2026-25780 has an EPSS score of 0.27% (18th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-25780?

Upgrade mattermost server to 11.3.1 or later.

CVE & CISA-KEV Catalog

CVE-2026-25780

MEDIUM

4.3

CVSS v3

NVD

Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to bound memory allocation when processing DOC files which allows an authenticated attacker to cause server memory exhaustion and denial of service via uploading a specially crafted DOC file.. Mattermost Advisory ID: MMSA-2026-00581

CWE-789

How to fix

Remediation Available

mattermost serverNVD

Affected:>= 11.3.0, < 11.3.1Fixed in:11.3.1CVE-2026-25780derived 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 ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.27%probability of exploitation in 30 days

18thpercentile

Low risk: more likely to be exploited than 18% of all known CVEs.

References

Vendor Advisory1

mattermost.com

Related Vulnerabilities

Other CWE-789 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-30522	High	7.5	90%	-	Fix
CVE-2026-49975	High	7.5	11%	-	Fix
CVE-2025-27533	High	7.5	8.6%	-	Fix
CVE-2017-7651	High	7.5	5.3%	-	Fix
CVE-2021-31811	Medium	5.5	3.4%	-	-
CVE-2021-27906	Medium	5.5	3.3%	-	Fix

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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 2026-03-18.