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NVD / CVE Program· CNA Mattermost

CVE-2025-62690: Open redirect in error page when link opened in new tab

MediumCVSS 6.1 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.14% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: github.com/mattermost/mattermost (Go) 10.11.5-0.20251016131338-dad6bd7a1509, 11.1.0+incompatible, 11.1.0; github.com/mattermost/mattermost/server/v8 (Go) 8.0.0-20251016131338-dad6bd7a1509; govulncheck-vulndb (openSUSE:Leap 15.6) 0.0.20260114T191543-150000.1.137.1.
  • Severity is disputed: the assigning authority (CNA) scores it 3.1, NVD 6.1.

Low priority for now. Upgrade to github.com/mattermost/mattermost (Go) 10.11.5-0.20251016131338-dad6bd7a1509, 11.1.0+incompatible, 11.1.0; github.com/mattermost/mattermost/server/v8 (Go) 8.0.0-20251016131338-dad6bd7a1509; govulncheck-vulndb (openSUSE:Leap 15.6) 0.0.20260114T191543-150000.1.137.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Mattermost versions 10.11.x <= 10.11.4 fail to validate redirect URLs on the /error page, which allows an attacker to redirect a victim to a malicious site via a crafted link opened in a new tab.

Published
Dec 17, 2025
Updated
Oct 13, 2026
EPSS
0.1% · 4th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
6.1
CNA · Mattermost
3.1
3.0 point gap

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-62690

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mattermostmattermost server

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Mattermost). Independent of NVD's CPE analysis and usually ahead of it.

  • Mattermost Mattermost

    • 11.1.0, 10.11.5not affected
    • 10.11.0 and later · up to and including 10.11.4affected · semver

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mattermost mattermost server10.11.0 and later · before 10.11.5

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Gogithub.com/mattermost/mattermostfrom 10.11.0-rc1 · before 10.11.5-0.20251016131338-dad6bd7a150910.11.5-0.20251016131338-dad6bd7a1509
Gogithub.com/mattermost/mattermostfrom 10.11.0-rc1+incompatible · before 11.1.0+incompatible11.1.0+incompatible
Gogithub.com/mattermost/mattermostfrom 11.0.0-alpha.1 · before 11.1.011.1.0
Gogithub.com/mattermost/mattermost-serverfrom 0—
Gogithub.com/mattermost/mattermost-server/v5from 0—
Gogithub.com/mattermost/mattermost-server/v6from 0—
Gogithub.com/mattermost/mattermost/server/v8from 8.0.0-20250721062209-4952acea88ce · before 8.0.0-20251016131338-dad6bd7a15098.0.0-20251016131338-dad6bd7a1509
openSUSE:Leap 15.6govulncheck-vulndbbefore 0.0.20260114T191543-150000.1.137.10.0.20260114T191543-150000.1.137.1

Same product

mattermost: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-4858Path traversal in integration action URL leading to arbitrary API execution via system admin’s auth token.
    39Monitor
  • CVE-2025-12421Account Takeover via Code Exchange Endpoint
    39Monitor
  • CVE-2025-12419Account takeover on OAuth/OpenID-enabled servers
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2025-13352Dec 17, 2025 · Mattermost GitHub Plugin allows unauthorized GitHub reactions via reaction forwarding hijacking
    12Monitor
  • ← EarlierCVE-2025-62190Dec 17, 2025 · CSRF Allows Call Initiation and Message Delivery
    17Monitor
  • Later →CVE-2025-12689Dec 17, 2025 · DoS in Calls plugin via malformed UTF-8 in WebSocket request
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Go:github.com/mattermost/mattermost10.11.5-0.20251016131338-dad6bd7a1509Package registry (OSV)
Go:github.com/mattermost/mattermost11.1.0Package registry (OSV)
Go:github.com/mattermost/mattermost11.1.0+incompatiblePackage registry (OSV)
Go:github.com/mattermost/mattermost/server/v88.0.0-20251016131338-dad6bd7a1509Package registry (OSV)
opensuse:govulncheck-vulndb0.0.20260114T191543-150000.1.137.1 · openSUSE:Leap 15.6Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-12985271 days apartMattermost DCR redirect URI allowlist bypass via improper URL component validation
    37Monitor
  • CVE-2025-908493 days apartOpen redirect in OAuth login
    24Monitor
  • CVE-2025-907293 days apartOne-Click Mattermost Account Takeover via Poisoned RelayState SAML Parameter
    21Monitor

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Not on record for this CVE: EPSS history · patch commit or PR link.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records