# CVE-2024-1887: Public channel post content accessible without membership when compliance export is enabled > Attackers can read public channel posts without membership when compliance export is enabled, bypassing audit controls. - **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 29 Feb 2024 - **Updated:** 7 Aug 2024 - **Also known as:** GHSA-fx48-xv6q-6gp3, GO-2024-2591 ## What is CVE-2024-1887? CVE-2024-1887 is a medium-severity missing authorization vulnerability in Mattermost Mattermost Server, published on 29 Feb 2024. Any signed-in user can exploit it over the network, with no action from the victim. ### Official description Mattermost fails to check if compliance export is enabled when fetching posts of public channels allowing a user that is not a member of the public channel to fetch the posts, which will not be audited in the compliance export. Weakness: CWE-284 (Improper Access Control) ## Which versions are affected by CVE-2024-1887? 10 open source packages ship an affected version, including github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server and github.com/mattermost/mattermost-server/v5. It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `github.com/mattermost/mattermost/server/v8` | Go | All versions | None | | `github.com/mattermost/mattermost/server/v8` | Go | All versions | 8.1.9 | | `github.com/mattermost/mattermost/server/v8` | Go | All versions | 8.1.9 | | `github.com/mattermost/mattermost/server/v8` | Go | From 9.2.0 | 9.2.5 | | `github.com/mattermost/mattermost/server/v8` | Go | From 9.2.0 | 9.2.5 | | `github.com/mattermost/mattermost/server/v8` | Go | From 9.3.0 | 9.3.1 | | `github.com/mattermost/mattermost/server/v8` | Go | From 9.3.0 | 9.3.1 | | `github.com/mattermost/mattermost-server` | Go | From 9.2.0+incompatible | 9.2.5+incompatible, 9.3.1+incompatible | | `github.com/mattermost/mattermost-server/v5` | Go | All versions | None | | `github.com/mattermost/mattermost-server/v6` | Go | All versions | None | Products: Mattermost Mattermost Server. ## How do I fix CVE-2024-1887? Upgrade github.com/mattermost/mattermost/server/v8 to a fixed version for your release line: 8.1.9, 9.2.5 or 9.3.1. ## Is CVE-2024-1887 being exploited? There is no known exploitation of CVE-2024-1887 in the wild and no public exploit code. ## Other vulnerabilities in Mattermost Mattermost Server - [CVE-2025-12419](https://insights.sbomify.com/CVE-2025-12419/): Account takeover on OAuth/OpenID-enabled servers (critical 9.9) - [CVE-2025-12421](https://insights.sbomify.com/CVE-2025-12421/): Account Takeover via Code Exchange Endpoint (critical 9.9) - [CVE-2025-4981](https://insights.sbomify.com/CVE-2025-4981/): Path Traversal Leading to RCE by Any Authenticated Mattermost User (critical 9.9) - [CVE-2025-20051](https://insights.sbomify.com/CVE-2025-20051/): Arbitrary file read via block duplication in Mattermost Boards (critical 9.9) - [CVE-2025-25279](https://insights.sbomify.com/CVE-2025-25279/): Arbitrary file read in Mattermost Boards via import & export board archive (critical 9.9) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2024-1887 and fix it if it is affected. What it is: CVE-2024-1887 is a medium-severity missing authorization vulnerability in Mattermost Mattermost Server, published on 29 Feb 2024. Any signed-in user can exploit it over the network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2024-1887 in the wild and no public exploit code. Affected packages and fixed versions: - github.com/mattermost/mattermost/server/v8 (Go): affected all versions; no fix listed - github.com/mattermost/mattermost/server/v8 (Go): affected all versions; fixed in 8.1.9 - github.com/mattermost/mattermost/server/v8 (Go): affected all versions; fixed in 8.1.9 - github.com/mattermost/mattermost/server/v8 (Go): affected from 9.2.0; fixed in 9.2.5 - github.com/mattermost/mattermost/server/v8 (Go): affected from 9.2.0; fixed in 9.2.5 - github.com/mattermost/mattermost/server/v8 (Go): affected from 9.3.0; fixed in 9.3.1 - github.com/mattermost/mattermost/server/v8 (Go): affected from 9.3.0; fixed in 9.3.1 - github.com/mattermost/mattermost-server (Go): affected from 9.2.0+incompatible; fixed in 9.2.5+incompatible, 9.3.1+incompatible - 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-2024-1887/ (Markdown: https://insights.sbomify.com/CVE-2024-1887/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2024-1887 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-1887 - OSV: https://osv.dev/vulnerability/CVE-2024-1887 --- From sbomify Insights: https://insights.sbomify.com/CVE-2024-1887/ Summaries are generated and may contain mistakes; the official description above is the record.