CVE-2025-62690 Open redirect in error page when link opened in new tab
Low 3.1
Published
Updated
Check this codebase for CVE-2025-62690 and fix it if it is affected.
What it is: CVE-2025-62690 is a low-severity vulnerability in Mattermost Mattermost Server, published on 17 Dec 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-62690 in the wild and no public exploit code.
Affected packages and fixed versions:
- github.com/mattermost/mattermost/server/v8 (Go): affected from 8.0.0-20250721062209-4952acea88ce; fixed in 8.0.0-20251016131338-dad6bd7a1509
- github.com/mattermost/mattermost/server/v8 (Go): affected from 8.0.0-20250721062209-4952acea88ce; fixed in 8.0.0-20251016131338-dad6bd7a1509
- github.com/mattermost/mattermost/server/v8 (Go): affected from 8.0.0-20250721062209-4952acea88ce; fixed in 8.0.0-20251016131338-dad6bd7a1509
- github.com/mattermost/mattermost (Go): affected from 10.11.0-rc1; fixed in 10.11.5-0.20251016131338-dad6bd7a1509
- github.com/mattermost/mattermost (Go): affected from 10.11.0-rc1; fixed in 10.11.5-0.20251016131338-dad6bd7a1509
- github.com/mattermost/mattermost (Go): affected from 10.11.0-rc1+incompatible; fixed in 11.1.0+incompatible
- github.com/mattermost/mattermost (Go): affected from 11.0.0-alpha.1; fixed in 11.1.0
- github.com/mattermost/mattermost (Go): affected from 11.0.0-alpha.1; fixed in 11.1.0
- github.com/mattermost/mattermost-server (Go): affected all versions; no fix listed
- github.com/mattermost/mattermost-server/v5 (Go): affected all versions; no fix listed
- github.com/mattermost/mattermost-server/v6 (Go): affected all versions; no fix listed
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2025-62690/ (Markdown: https://insights.sbomify.com/CVE-2025-62690/index.md)
Attackers can redirect users to malicious sites via crafted links on the error page, requiring users to open links in new tabs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-62690?
CVE-2025-62690 is a low-severity vulnerability in Mattermost Mattermost Server, published on 17 Dec 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-601
Which versions are affected by CVE-2025-62690?
11 open source packages ship an affected version, including github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost and github.com/mattermost/mattermost-server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/mattermost/mattermost/server/v8 Go | From 8.0.0-20250721062209-4952acea88ce | 8.0.0-20251016131338-dad6bd7a1509 |
github.com/mattermost/mattermost/server/v8 Go | From 8.0.0-20250721062209-4952acea88ce | 8.0.0-20251016131338-dad6bd7a1509 |
github.com/mattermost/mattermost/server/v8 Go | From 8.0.0-20250721062209-4952acea88ce | 8.0.0-20251016131338-dad6bd7a1509 |
github.com/mattermost/mattermost Go | From 10.11.0-rc1 | 10.11.5-0.20251016131338-dad6bd7a1509 |
github.com/mattermost/mattermost Go | From 10.11.0-rc1 | 10.11.5-0.20251016131338-dad6bd7a1509 |
github.com/mattermost/mattermost Go | From 10.11.0-rc1+incompatible | 11.1.0+incompatible |
5 more packages
github.com/mattermost/mattermost Go | From 11.0.0-alpha.1 | 11.1.0 |
github.com/mattermost/mattermost Go | From 11.0.0-alpha.1 | 11.1.0 |
github.com/mattermost/mattermost-server Go | All versions | None |
github.com/mattermost/mattermost-server/v5 Go | All versions | None |
github.com/mattermost/mattermost-server/v6 Go | All versions | None |
Products include Mattermost Mattermost Server.
How do I fix CVE-2025-62690?
Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20251016131338-dad6bd7a1509 or later.
Is CVE-2025-62690 being exploited?
There is no known exploitation of CVE-2025-62690 in the wild and no public exploit code.
Other vulnerabilities in Mattermost Mattermost Server
- CVE-2025-12419 Account takeover on OAuth/OpenID-enabled servers
- CVE-2025-12421 Account Takeover via Code Exchange Endpoint
- CVE-2025-4981 Path Traversal Leading to RCE by Any Authenticated Mattermost User
- CVE-2025-20051 Arbitrary file read via block duplication in Mattermost Boards
- CVE-2025-25279 Arbitrary file read in Mattermost Boards via import & export board archive
Sources
Also known as GHSA-q66g-q98c-q454, GO-2025-4248.