NVD / CVE Program· CNA Mattermost

CVE-2024-36257: Lack of permission check when updating the profile picture of a remote user (shared channels enabled)

MediumCVSS 5.3 · v3.1—No exploit No fix recorded

Noroxi assessment

Priority: Monitor (action score 21/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.30% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to the record, no fixed version is available yet.
Severity is disputed: the assigning authority (CNA) scores it 2.7, NVD 5.3.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Mattermost versions 9.5.x <= 9.5.5 and 9.8.0, when using shared channels with multiple remote servers connected, fail to check that the remote server A requesting the server B to update the profile picture of a user is the remote that actually has the user as a local one . This allows a malicious remote A to change the profile images of users that belong to another remote server C that is connected to the server A.

Published: Jul 3, 2024
Updated: Jun 17, 2026
EPSS: 0.3% · 23th percentile
CWE: CWE-284

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 21 / 40 · 5.3 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 5.3
CNA · Mattermost: 2.7; 2.6 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
mattermost	mattermost	cpe:2.3:a:mattermost:mattermost

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Mattermost). Independent of NVD's CPE analysis and usually ahead of it.

Mattermost Mattermost
- 9.9.0, 9.8.1, 9.5.6not affected
- 9.8.0affected
- 9.5.0 and later · up to and including 9.5.5affected · semver

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

mattermost mattermost9.5.0 and later · before 9.5.6
mattermost mattermost9.8.0

Same product

mattermost: all records

Other highest-scoring records for the same primary product.

CVE-2024-39777Malicious remote can invite itself to an arbitrary local channel
38Monitor
CVE-2023-2193Oauth authorization codes do not expire when deauthorizing an oauth2 app
36Monitor
CVE-2019-20851An issue was discovered in Mattermost Mobile Apps before 1.26.0.
36Monitor

Published before and after this one in the same product

← EarlierCVE-2023-6202Nov 27, 2023 · Insecure Direct Object Reference in /plugins/focalboard/ api/v2/users of Mattermost Boards
17Monitor
← EarlierCVE-2023-7114Dec 29, 2023 · Mattermost version 2.10.0 and earlier fails to sanitize deeplink paths, which allows an attacker to perform CSRF attacks against the server.
35Monitor
Later →CVE-2024-39353Jul 3, 2024 · RemoteClusterFrame payloads are audit logged in full
10Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Juho ForsénMattermostfinder

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2024-3977729 days apartMalicious remote can invite itself to an arbitrary local channel
38Monitor
CVE-2024-807150 days apartSystem Role with edit access to permissions can elevate themselves to system admin
28Monitor
CVE-2024-64280 days apartLimited DoS due to permitting creating users with user-defined IDs
26Monitor
CVE-2024-3927429 days apartMalicious remote can add users to arbitrary teams and channels
26Monitor
CVE-2024-3649229 days apartExisting local user overwritten by malicious remote
25Monitor
CVE-2024-393610 days apartCreating posts with user-defined IDs permitted in CreatePost API
21Monitor