CVE-2026-2325 json
Improper Input Validation in MS Teams Meetings API Handler
published 2026-05-18 5 mo ago modified 2026-10-14 25 d ago also GHSA-m3p3-8frq-q7qh , GO-2026-5489 , EUVD-2026-30737
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 15%
- public exploits
- 0
- none known
Summary
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to limit the size of the request body on the start meeting API endpoint, which allows an authenticated attacker to cause resource exhaustion or denial of service via a crafted oversized HTTP POST request to {{/api/v1/meetings}}.. Mattermost Advisory ID: MMSA-2026-00608
Patch / fix
- go github.com/mattermost/mattermost-server 10.11.14, 10.11.14+incompatible, 11.4.4, 11.4.4+incompatible, 11.5.2, 11.5.2+incompatible
- go github.com/mattermost/mattermost-plugin-msteams-meetings 1.1.1-0.20260213105619-c5892dd169de
- Mattermost Mattermost 10.11.14, 11.4.4, 11.5.2, 11.6.0
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | >=11.5.0, <11.5.2 >=10.11.0, <10.11.14 >=11.4.0, <11.4.4 >=10.11.0+incompatible, <10.11.14+incompatible >=11.4.0+incompatible, <11.4.4+incompatible >=11.5.0+incompatible, <11.5.2+incompatible |
11.5.2 10.11.14 11.4.4 10.11.14+incompatible 11.4.4+incompatible 11.5.2+incompatible |
| go | github.com/mattermost/mattermost-plugin-msteams-meetings | <1.1.1-0.20260213105619-c5892dd169de |
1.1.1-0.20260213105619-c5892dd169de |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-770 Allocation of Resources Without Limits or Throttling
References
-
github.com
/mattermost/mattermost-plugin-msteams-meetings/commit/c5892dd169de865504afa2dd02eaeb6287489f7f
web, patch
-
mattermost.com
/security-updates
vendor-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-2325
advisory
-
github.com
/mattermost/mattermost
package
-
github.com
/advisories/GHSA-m3p3-8frq-q7qh
advisory
Sources
- CVE List CVE-2026-2325
- GitHub Advisory GHSA-m3p3-8frq-q7qh
- NVD CVE-2026-2325
- OSV GO-2026-5489
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