CVE-2026-30920 — @oneuptime/common
HIGHCVE-2026-30920 is a high-severity (CVSS 8.6) CWE-345 vulnerability in @oneuptime/common. A fix is available for @oneuptime/common — see the affected versions and patch details below.
OneUptime has broken access control in GitHub App installation flow that allows unauthorized project binding
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-30920.
EPSS Exploitation Probability
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.
How urgent is this, really
CVE-2026-30920 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,333 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
@oneuptime/commonnpmDescription
Summary
OneUptime's GitHub App callback trusts attacker-controlled state and installation_id values and updates Project.gitHubAppInstallationId with isRoot: true without validating that the caller is authorized for the target project. This allows an attacker to overwrite another project's GitHub App installation binding.
Related GitHub endpoints also lack effective authorization, so a valid installation ID can be used to enumerate repositories and create CodeRepository records in an arbitrary project.
Details
The callback decodes unsigned base64 JSON from state and uses the embedded projectId directly:
It then writes the supplied installation_id into the target project with root privileges:
await ProjectService.updateOneById({
id: new ObjectID(projectId),
data: { gitHubAppInstallationId: installationId },
props: { isRoot: true },
});
The userId in state is only checked for presence, not authenticity:
The install flow also generates state as plain base64 JSON, not a signed or session-bound token:
The follow-on endpoints are also vulnerable:
- Repository listing: https://github.com/OneUptime/oneuptime/blob/master/Common/Server/API/GitHubAPI.ts#L179-L258
- Repository connect: https://github.com/OneUptime/oneuptime/blob/master/Common/Server/API/GitHubAPI.ts#L260-L356
- Middleware allows requests with no token to continue as
Public: https://github.com/OneUptime/oneuptime/blob/master/Common/Server/Middleware/UserAuthorization.ts#L205-L211 - Installation tokens are minted from any valid installation ID: https://github.com/OneUptime/oneuptime/blob/master/Common/Server/Utils/CodeRepository/GitHub/GitHub.ts#L347-L425
PoC
Minimal proof of unauthorized project tampering:
STATE=$(printf '%s' '{"projectId":"<victim-project-uuid>","userId":"x"}' | base64 | tr -d '\n')
curl -isk "https://<host>/api/github/auth/callback?installation_id=999999999&state=${STATE}"
Expected result:
- Server returns a
302redirect to/dashboard/<victim-project-uuid>/code-repository?installation_id=999999999 - The target project's
gitHubAppInstallationIdis overwritten
Impact
- Unauthorized modification of
Project.gitHubAppInstallationId - Temporary GitHub integration breakage if a bogus installation ID is set
- Cross-project binding of attacker-controlled GitHub App installations
- Repository metadata disclosure for a supplied valid installation ID
- Unauthorized creation of
CodeRepositoryrecords in arbitrary projects
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @oneuptime/common | all versions | 10.0.19npm install @oneuptime/common@10.0.19 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @oneuptime/common, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update @oneuptime/common to 10.0.19 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-30920 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 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-30920 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2026-30920. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2026-30920 in your dependencies?
O3 Security finds CVE-2026-30920 across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.