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Fencer Intel
high 7.6

CVE-2025-9072 json

One-Click Mattermost Account Takeover via Poisoned RelayState SAML Parameter

published last yr. modified 21d ago also GHSA-69j8-prx2-vx98 , GO-2025-3958 , EUVD-2025-29171

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 7%
public exploits
0
none known

Summary

Mattermost versions 10.10.x <= 10.10.1, 10.5.x <= 10.5.9, 10.9.x <= 10.9.4 fail to validate the redirect_to parameter, allowing an attacker to craft a malicious link that, once a user authenticates with their SAML provider, could post the user’s cookies to an attacker-controlled URL.

Patch / fix

  • go github.com/mattermost/mattermost-server 10.5.10, 10.5.10+incompatible, 10.9.5, 10.9.5+incompatible, 10.10.2, 10.10.2+incompatible
  • go github.com/mattermost/mattermost/server/v8 8.0.0-20250731063404-9eebaadf8f72
  • Mattermost Mattermost 10.5.10, 10.9.5, 10.10.2, 10.11.0
  • govulncheck-vulndb SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 0.0.20250918T182144-150000.1.107.1

suse advisories SUSE-SU-2025:03289-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20250917T170349-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2025:15564-1

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
last yr.

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% 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:L/UI:R/S:U/C:H/I:H/A:L
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
GitHub 3.1 7.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

Affected packages

ecosystem package affected fixed in
go github.com/mattermost/mattermost-server
>=10.10.0, <10.10.2
>=10.5.0, <10.5.10
>=10.9.0, <10.9.5
>=10.5.0+incompatible, <10.5.10+incompatible
>=10.9.0+incompatible, <10.9.5+incompatible
>=10.10.0+incompatible, <10.10.2+incompatible
10.10.2
10.5.10
10.9.5
10.5.10+incompatible
10.9.5+incompatible
10.10.2+incompatible
go github.com/mattermost/mattermost/server/v8
<8.0.0-20250731063404-9eebaadf8f72
8.0.0-20250731063404-9eebaadf8f72
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
  • CWE-601 URL Redirection to Untrusted Site

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.