How severe is GHSA-5mvm-89c9-9gm5?

GHSA-5mvm-89c9-9gm5 has a CVSS score of 2.7/10, rated LOW. Review your exposure and patch according to your risk tolerance.

Which packages are affected by GHSA-5mvm-89c9-9gm5?

GHSA-5mvm-89c9-9gm5 affects the following packages: matrix-appservice-irc (npm). Ecosystems affected: npm.

How do I fix GHSA-5mvm-89c9-9gm5?

Update matrix-appservice-irc to 3.0.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5mvm-89c9-9gm5 is resolved across your whole dependency graph.

How do I detect GHSA-5mvm-89c9-9gm5 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for matrix-appservice-irc. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate GHSA-5mvm-89c9-9gm5 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against GHSA-5mvm-89c9-9gm5?

O3 pinpoints whether GHSA-5mvm-89c9-9gm5 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is GHSA-5mvm-89c9-9gm5 actively exploited in the wild?

No public exploit code has been indexed for GHSA-5mvm-89c9-9gm5 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-5mvm-89c9-9gm5?

GHSA-5mvm-89c9-9gm5 has an EPSS (Exploit Prediction Scoring System) score of 0.3%, placing it in the 26th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-5mvm-89c9-9gm5?

GHSA-5mvm-89c9-9gm5 is classified as CWE-77 (CWE-77), CWE-88 (CWE-88). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-5mvm-89c9-9gm5 published, and has it been updated?

GHSA-5mvm-89c9-9gm5 was published on February 25, 2025 and was last updated on February 25, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

GHSA-5mvm-89c9-9gm5: matrix-appservice-irc (Low 2.7)

EPSS Exploitation Probability

via FIRST.org ↗

0.3%probability of exploitation in next 30 days

Lower Risk26th percentile-0.40%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

1 pkg affected

Weekly download volume for affected packages — a proxy for how broadly this vulnerability is deployed.

matrix-appservice-ircnpm

83downloads / week

Description

Impact

The matrix-appservice-irc bridge up to version 3.0.3 contains a vulnerability which can lead to arbitrary IRC command execution as the puppeted user. The attacker can only inject commands executed as their own IRC user.

Patches

The vulnerability has been patched in matrix-appservice-irc version 3.0.4.

For more information

If you have any questions or comments about this advisory, please email us at security at matrix.org.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`matrix-appservice-irc`	all versions	3.0.4

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for matrix-appservice-irc. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update matrix-appservice-irc to 3.0.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5mvm-89c9-9gm5 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-5mvm-89c9-9gm5 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-5mvm-89c9-9gm5. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Impact The matrix-appservice-irc bridge up to version 3.0.3 contains a vulnerability which can lead to arbitrary IRC command execution as the puppeted user. The attacker can only inject commands executed as their own IRC user. ### Patches The vulnerability has been patched in matrix-appservice-irc version 3.0.4. ### For more information If you have any questions or comments about this advisory, please email us at [security at matrix.org](mailto:[email protected]).

O3 Security · Impact-Aware SCA

Is GHSA-5mvm-89c9-9gm5 in your dependencies?

O3 detects GHSA-5mvm-89c9-9gm5 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my dependencies How O3 SCA works

GHSA-5mvm-89c9-9gm5