CVE-2025-49090 Business logic in Matrix specification
High 7.1
Published
Updated
Check this codebase for CVE-2025-49090 and fix it if it is affected.
What it is: CVE-2025-49090 is a high-severity vulnerability in Matrix specification, published on 2 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-49090 in the wild and no public exploit code.
Affected product: Matrix specification. No package-level version data is available, so check the vendor advisory linked from the reference page.
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-2025-49090/ (Markdown: https://insights.sbomify.com/CVE-2025-49090/index.md)
Deficient state resolution in older Matrix specifications allows attackers to bypass security controls, requiring specification upgrades.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-49090?
CVE-2025-49090 is a high-severity vulnerability in Matrix specification, published on 2 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Matrix specification before 1.16 (i.e., with a room version before 12 and State Resolution before 2.1) has deficient state resolution.
Weakness: CWE-642
Which versions are affected by CVE-2025-49090?
Linux distribution packages (1)
matrix-synapse openSUSE:Tumbleweed | All versions | 1.136.0-1.1 |
How do I fix CVE-2025-49090?
Upgrade to a fixed version.
Is CVE-2025-49090 being exploited?
There is no known exploitation of CVE-2025-49090 in the wild and no public exploit code.
Sources
Also known as GHSA-jhc3-vch4-27rh, openSUSE-SU-2025:15436-1.