CVE-2026-3109Disclosure(mattermost / mattermost_server)

LOWCVSS 2.2 · LOW

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Mattermost Plugins versions <=11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via replayed webhook requests. Mattermost Advisory ID: MMSA-2026-00584

mattermost CVEs Back to dashboard

0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories

https://mattermost.com/security-updates

Weakness type (CWE)

CWE-754

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

mattermost_server

Threat summary

4 mentions across 3 observed days
Momentum state: stable

What's happening

Technical details provided in 3 signals
Disclosure: 3 classified signals
Disclouser: 1 classified signal
Peaked 1d ago at 2 mentions (2026-03-27); latest day: 1
4 total mentions across 3 days

Affected systems

Vendors

mattermost

Products

mattermost_server

Deep dive

Activity timeline4 mentions / 3d

Signal classification2 categories

Disclosure

375.0%

Disclouser

125.0%

Referenced assets5 URLs

By indicator

Classification over time

Date	Total	Labels

2026-03-26	1	Disclosure1
2026-03-27	2	Disclosure2
2026-06-08	1	Disclouser1

Full discourse4 posts

DailyCVE@dailycve122d
Disclouser
🔵 Mattermost Plugins, Missing Timestamp Validation (#CVE-2026-3109) (Low) -DC-Jun2026-251 https://dailycve.com/mattermost-plugins-missing-timestamp-validation-cve-2026-3109-low-dc-jun2026-251/
Post summary
The text announces a low‑severity CVE (2026‑3109) involving missing timestamp validation but provides no PoC, exploit, or patch details.
0000045
210 followersView on X
Infoflowcloud@infoflowcloud195d
Disclosure
🚨*CVE* CVE-2026-3109 Mattermost Plugins versions <=11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via repla… https://www.cve.org/CVERecord?id=CVE-2026-3109 ----- Traducción: CVE-2026-3109: Ve… http://infoflow.cloud`
Post summary
The post announces CVE‑2026‑3109, describing the timestamp validation flaw in specific Mattermost plugin versions and its impact on Zoom meeting state, but it does not provide a PoC, exploit, patch, or evidence of active exploitation.
0000028
65 followersView on X
CVE@CVEnew195d
Disclosure
CVE-2026-3109 Mattermost Plugins versions <=11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via repla… https://www.cve.org/CVERecord?id=CVE-2026-3109
Post summary
The note reports a timestamp validation flaw in Mattermost plugins that can let attackers corrupt Zoom meeting state via crafted webhooks.
00000197
56.9K followersView on X
Vulmon Vulnerability Feed@VulmonFeeds196d
Disclosure
CVE-2026-3109 Mattermost Plugins versions <=11.4 10.11.11.0 fail to validate web... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-3109 Customizable Vulnerability Alerts: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=4
Post summary
The message announces CVE‑2026‑3109 against Mattermost Plugins versions <=11.4 10.11.11.0, linking to a details page, but offers no PoC, exploit, or patch information.
0000058
4.0K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	mattermost	mattermost_server	-	-	-

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What researchers are saying

CVE-2026-3109

DailyCVE@dailycveDisclouser

The text announces a low‑severity CVE (2026‑3109) involving missing timestamp validation but provides no PoC, exploit, or patch details.

Infoflowcloud@infoflowcloudDisclosure

The post announces CVE‑2026‑3109, describing the timestamp validation flaw in specific Mattermost plugin versions and its impact on Zoom meeting state, but it does not provide a PoC, exploit, patch, or evidence of active exploitation.

CVE@CVEnewDisclosure

The note reports a timestamp validation flaw in Mattermost plugins that can let attackers corrupt Zoom meeting state via crafted webhooks.

Vulmon Vulnerability Feed@VulmonFeedsDisclosure

The message announces CVE‑2026‑3109 against Mattermost Plugins versions <=11.4 10.11.11.0, linking to a details page, but offers no PoC, exploit, or patch information.