CVE-2026-2476 json
MS Teams plugin sensitive config values not properly masked in support packets
published 7mo ago modified 4mo ago also GHSA-4ppj-6chv-5pgc , GO-2026-4784 , EUVD-2026-12387
- cvss
- 7.6
- 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 8%
- public exploits
- 0
- none known
Summary
Mattermost Plugins versions <=2.0.3.0 fail to properly mask sensitive configuration values which allows an attacker with access to support packets to obtain original plugin settings via exported configuration data. Mattermost Advisory ID: MMSA-2026-00606
Patch / fix
- go github.com/mattermost/mattermost-plugin-msteams 1.15.1-0.20260102165339-036c761bd3cb
- Mattermost Mattermost 2.3.1.0
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260326T203309-150000.1.155.2
suse advisories SUSE-SU-2026:1135-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
Is CVE-2026-2476 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7mo ago
Exploit prediction
0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.6 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N |
| NVD | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| GitHub | 3.1 | 7.6 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-plugin-msteams | <1.15.1-0.20260102165339-036c761bd3cb |
1.15.1-0.20260102165339-036c761bd3cb |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
-
github.com
/mattermost/mattermost-plugin-msteams/commit/036c761bd3cb9ece92c17f2b151dfa906cebdcf6
web, patch
-
mattermost.com
/security-updates
vendor-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-2476
advisory
-
github.com
/mattermost/mattermost-plugin-msteams
package
-
github.com
/advisories/GHSA-4ppj-6chv-5pgc
advisory
Sources
- CVE List CVE-2026-2476
- GitHub Advisory GHSA-4ppj-6chv-5pgc
- NVD CVE-2026-2476
- OSV GO-2026-4784
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.