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Fencer Intel
medium 4.1

CVE-2025-64641 json

Mattermost Jira plugin crafted action leaks Jira issue details

published 10mo ago modified 21d ago also GHSA-vww6-79rv-3j4x , GO-2025-4260 , EUVD-2025-205062

cvss
4.1
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 6%
public exploits
0
none known

Summary

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fail to verify that post actions invoking /share-issue-publicly were created by the Jira plugin which allowed a malicious Mattermost user to exfiltrate Jira tickets when victim users interacted with affected posts

Patch / fix

  • go github.com/mattermost/mattermost/server/v8 8.0.0-20251121122154-b57c297c6d7
  • go github.com/mattermost/mattermost-server 10.11.8, 10.11.8+incompatible, 10.12.4, 10.12.4+incompatible, 11.0.6, 11.0.6+incompatible, 11.1.1, 11.1.1+incompatible
  • Mattermost Mattermost 10.11.8, 10.12.4, 11.0.6, 11.1.1, 11.2.0
  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20260226T182644-150000.1.149.1

suse advisories SUSE-SU-2026:0757-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
10mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 4.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N
NVD 3.1 4.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N
GitHub 3.1 4.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
go github.com/mattermost/mattermost/server/v8
<8.0.0-20251121122154-b57c297c6d7
all versions
8.0.0-20251121122154-b57c297c6d7
go github.com/mattermost/mattermost-server
>=10.11.0, <10.11.8
>=10.12.0, <10.12.4
>=11.0.0, <11.0.6
>=11.1.0, <11.1.1
>=10.11.0+incompatible, <10.11.8+incompatible
>=10.12.0+incompatible, <10.12.4+incompatible
>=11.0.1+incompatible, <11.0.6+incompatible
>=11.1.0+incompatible, <11.1.1+incompatible
10.11.8
10.12.4
11.0.6
11.1.1
10.11.8+incompatible
10.12.4+incompatible
11.0.6+incompatible
11.1.1+incompatible
go github.com/mattermost/mattermost-server/v5
all versions
 no fix listed
go github.com/mattermost/mattermost-server/v6
all versions
 no fix listed

Affected products

  • Mattermost Mattermost

Classification

Weakness

References

Sources

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.