CVE-2023-49809

mediumpriority · track · 26EPSS 0.006 · 51 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.64% (51st) EPSS

CVSS 6.5 · medium

Is it mine?

5 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

Mattermost fails to handle a null request body in the /add endpoint, allowing a simple member to send a request with null request body to that endpoint and make it crash. After a few repetitions, the plugin is disabled.

cvss

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Lsecondary · responsibledisclosure@mattermost.comexploitability 2.8 · impact 1.4

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400USprimary

affected products (5)

Products and version ranges known to be affected.

Mattermost Mattermost≤ 0 ≤8.1.5enisa_euvdEU
mattermost mattermost server≤ 8.1.5nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server9.0.0 → 9.1.0nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Bitnami mattermost< 8.1.6osvUSpkg:bitnami/mattermost
Bitnami mattermost9.0.0 → 9.1.1osvUSpkg:bitnami/mattermost

advisories (1)

Vendor and ecosystem advisories describing this.

BIT-mattermost-2023-498092024-03-06vendor · osvUS
Mattermost fails to handle a null request body in the /add endpoint, allowing a simple member to send a request with null request body to that endpoint and make it crash. After a few repetitions, the plugin is disabled.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2023-12-12modified 2026-06-17

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+9607 more

references (4)

External citations — patches, advisories, analysis.

https://cxsecurity.com/cveshow/CVE-2023-49809/cnnvd
https://mattermost.com/security-updates cnnvd
https://mattermost.com/security-updates enisa_euvd
https://mattermost.com/security-updatesIssue TrackingVendor Advisorynvd

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