Is CVE-2026-2578 actively exploited?

No active exploitation of CVE-2026-2578 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-2578 be exploited remotely?

Yes. CVE-2026-2578 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-2578?

CVE-2026-2578 has a CVSS score of 4.3 (MEDIUM).

HOME VULNERABILITIESCVE-2026-2578

MEDIUM

CVE-2026-2578

CWE-201Published: March 16, 2026· Updated: Mar 18, 2026

4.3

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.2th

Official Description

Mattermost versions 11.3.x <= 11.3.0 fail to preserve the redacted state of burn-on-read posts during deletion which allows channel members to access unrevealed burn-on-read message contents via the WebSocket post deletion event.. Mattermost Advisory ID: MMSA-2026-00579

NVD Source

Technical Analysis

CVE-2026-2578 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.Low

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Affected Vendors & Products

mattermost1 product

mattermost server

Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Exploit-DB

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

PacketStorm

Security advisories & exploits

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://mattermost.com/security-updates

News & Research Mentioning CVE-2026-2578

Siemens SIMATIC S7 PLC Web Server

CISA Alerts· May 14, 2026

View CSAF Summary SIMATIC S7 PLCs contain multiple vulnerabilities in the web server that could allow an attacker to perform cross-site scripting attacks. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens is preparing further fix versions and recommends specific countermeasures for products where fixes are not, or not yet available. The following versions of Siemens SIMATIC S7 PLC Web Server are affected: SIMATIC Drive Controller CPU 1504D TF (6ES7615-4DF10-0AB0) vers:intdot/<3.1.6 (CVE-2026-25786, CVE-2026-25787, CVE-2026-25789) SIMATIC Drive Controller CPU 1507D TF (6ES7615-7DF10-0AB0) vers:intdot/<3.1.6 (CVE-2026-25786, CVE-2026-25787, CVE-2026-25789) SIMATIC ET 200SP CPU 1510S [xlite_meta score:73 src:CISA Alerts xlite_fp:ef3a512b496625a23af31ebb67fe8fd2aad71c418ba35d35bcb0eefd14a5a88b]