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CVE-2025-20086

Insufficient Input Validation on Post Props

6.5 MediumFix available

Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.45%Up 0.4 points since Jan 16, 2025
90%50%10%1%

What each source reports

CVE List Score used 6.5

Insufficient Input Validation on Post Props

Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.

Record
CVE-2025-20086
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-1287
Updated
2026-11-02
EUVDEUVD-2025-0091 6.5

Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.

Record
EUVD-2025-0091
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-03
GitHub AdvisoriesGHSA-5m7j-6gc4-ff5g 6.5

Mattermost fails to properly validate post props

Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.

Record
GHSA-5m7j-6gc4-ff5g
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-1287
Updated
2026-11-02
NVD 6.5

Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.

Record
CVE-2025-20086
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-1287
Updated
2026-11-02
OSV 6.5

Insufficient Input Validation on Post Props

Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.

Record
CVE-2025-20086
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-1287
Updated
2026-11-02
OSVGHSA-5m7j-6gc4-ff5g 6.5

Mattermost fails to properly validate post props

Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.

Record
GHSA-5m7j-6gc4-ff5g
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-1287
Updated
2026-11-02
OSVGO-2025-3392 No score

Mattermost fails to properly validate post props in github.com/mattermost/mattermost-server

Mattermost fails to properly validate post props in github.com/mattermost/mattermost-server

Record
GO-2025-3392
Updated
2026-11-02
OSVopenSUSE-SU-2025:14704-1 No score

govulncheck-vulndb-0.0.20250117T214834-1.1 on GA media

These are all security issues fixed in the govulncheck-vulndb-0.0.20250117T214834-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2025:14704-1
Updated
2026-11-02
OSVSUSE-SU-2025:0297-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20250128T150132 2025-01-28T15:01:32Z. Refs jsc#PED-11136 Go CVE Numbering Authority IDs added or updated with aliases:

    • GO-2025-3409 CVE-2025-23208 GHSA-c9p4-xwr9-rfhx
    • GO-2025-3410 CVE-2025-24337 GHSA-3qc3-mx6x-267h
    • GO-2025-3413 CVE-2025-0377 GHSA-wpfp-cm49-9m9q
    • GO-2025-3414 CVE-2024-11218 GHSA-5vpc-35f4-r8w6
    • GO-2025-3415 CVE-2025-23028 GHSA-9m5p-c77c-f9j7
    • GO-2025-3416 CVE-2025-23047 GHSA-h78m-j95m-5356
    • GO-2025-3418 CVE-2025-24030 GHSA-j777-63hf-hx76
    • GO-2025-3419 CVE-2025-24355 GHSA-v34r-vj4r-38j6
    • GO-2025-3422 CVE-2025-24354

  • Update to version 0.0.20250128T004730 2025-01-28T00:47:30Z. Refs jsc#PED-11136 Go CVE Numbering Authority IDs added or updated with aliases:

    • GO-2025-3372 CVE-2024-45339
    • GO-2025-3373 CVE-2024-45341
    • GO-2025-3383 CVE-2024-45340
    • GO-2025-3420 CVE-2024-45336
    • GO-2025-3421 CVE-2025-22865

  • Update to version 0.0.20250117T214834 2025-01-17T21:48:34Z. Refs jsc#PED-11136 Go CVE Numbering Authority IDs added or updated with aliases:

    • GO-2025-3392 CVE-2025-20086 GHSA-5m7j-6gc4-ff5g
    • GO-2025-3393 CVE-2025-21088 GHSA-8j3q-gc9x-7972
    • GO-2025-3394 CVE-2025-20088 GHSA-45v9-w9fh-33j6
    • GO-2025-3396 CVE-2024-52594
    • GO-2025-3397 CVE-2024-36402 GHSA-8vmr-h7h5-cqhg
    • GO-2025-3398 CVE-2024-52791 GHSA-gp86-q8hg-fpxj
    • GO-2025-3399 CVE-2024-52602 GHSA-r6jg-jfv6-2fjv
    • GO-2025-3400 CVE-2024-56515 GHSA-rcxc-wjgw-579r
    • GO-2025-3401 CVE-2024-36403 GHSA-vc2m-hw89-qjxf
    • GO-2025-3407 CVE-2025-20621 GHSA-w6xh-c82w-h997

  • Update to version 0.0.20250115T172141 2025-01-15T17:21:41Z. Refs jsc#PED-11136 Go CVE Numbering Authority IDs added or updated with aliases:

    • GO-2025-3381 CVE-2024-56138 GHSA-45v3-38pc-874v
    • GO-2025-3382 CVE-2024-51491 GHSA-qjh3-4j3h-vmwp
    • GO-2025-3384 CVE-2024-56323 GHSA-32q6-rr98-cjqv
    • GO-2025-3390 CVE-2024-53263 GHSA-q6r2-x2cc-vrp7
    • GO-2025-3391 CVE-2024-52281 GHSA-2v2w-8v8c-wcm9

  • Update to version 0.0.20250109T194159 2025-01-09T19:41:59Z. Refs jsc#PED-11136 Go CVE Numbering Authority IDs added or updated with aliases:

    • GO-2025-3376 CVE-2025-22149 GHSA-675f-rq2r-jw82
    • GO-2025-3377 CVE-2025-22449 GHSA-q8fg-cp3q-5jwm
    • GO-2025-3379 CVE-2025-20033 GHSA-2549-xh72-qrpm
    • GO-2025-3380 CVE-2025-22445 GHSA-7rgp-4j56-fm79
Record
SUSE-SU-2025:0297-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/mattermost/mattermost/server/v8
Go
 10.2.0 up to 10.2.1
10.2.1
github.com/mattermost/mattermost/server/v8
Go
 10.1.0 to 10.1.3
10.1.4
github.com/mattermost/mattermost/server/v8
Go
 10.0.0 to 10.0.3
10.0.4
github.com/mattermost/mattermost/server/v8
Go
 9.11.0 to 9.11.5
9.11.6
github.com/mattermost/mattermost/server/v8
Go
 before 8.0.0-20241127161322-25ff7a3779a5
8.0.0-20241127161322-25ff7a3779a5
github.com/mattermost/mattermost/server/v8
Go
 10.1.0 up to 10.1.4
10.1.4
github.com/mattermost/mattermost/server/v8
Go
 10.0.0 up to 10.0.4
10.0.4
github.com/mattermost/mattermost/server/v8
Go
 9.11.0 up to 9.11.6
9.11.6
github.com/mattermost/mattermost-server
Go
 9.11.0+incompatible up to 9.11.6+incompatible, 10.0.0+incompatible up to 10.0.4+incompatible, 10.1.0+incompatible up to 10.1.4+incompatible, 10.2.0+incompatible up to 10.2.1+incompatible
9.11.6+incompatible10.0.4+incompatible10.1.4+incompatible10.2.1+incompatible
github.com/mattermost/mattermost-server/v5
Go
 All versions None known
Show 4 moreShow less
Affected packages
PackageAffectedFixed
github.com/mattermost/mattermost-server/v6
Go
 All versions None known
govulncheck-vulndb
SUSE:Linux Enterprise Module for Package Hub 15 SP6
From an advisory covering 33 CVEs
 before 0.0.20250128T150132-150000.1.29.1
0.0.20250128T150132-150000.1.29.1
govulncheck-vulndb
openSUSE:Leap 15.6
From an advisory covering 33 CVEs
 before 0.0.20250128T150132-150000.1.29.1
0.0.20250128T150132-150000.1.29.1
govulncheck-vulndb
openSUSE:Tumbleweed
From an advisory covering 10 CVEs
 before 0.0.20250117T214834-1.1
0.0.20250117T214834-1.1

History

History
RecordedChangedSources
affected, facts
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-20086 is a medium vulnerability (CVSS 6.5) in Mattermost, published January 15, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 39th percentile. Fixed in github.com/mattermost/mattermost/server/v8 10.2.1.

References

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