GHSA-5jc6-h9w7-jm3p
MEDIUMMobile Security Framework (MobSF) Stored Cross-Site Scripting Vulnerability in "Diff or Compare" Functionality
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.
Blast Radius
mobsfReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Summary
The application allows users to upload files with scripts in the filename parameter. As a result, a malicious user can upload a script file to the system. When users in the application use the "Diff or Compare" functionality, they are affected by a Stored Cross-Site Scripting vulnerability.
Details
I found a Stored Cross-Site Scripting vulnerability in the "Diff or Compare" functionality. This issue occurs because the upload functionality allows users to upload files with special characters such as <, >, /, and " in the filename. This vulnerability can be mitigated by restricting file uploads to filenames containing only whitelisted characters, such as A-Z, 0-9, and specific special characters permitted by business requirements, like - or _ .
PoC
Complete instructions, including specific configuration details, to reproduce the vulnerability.
-
On MobSF version 4.2.8, I clicked on "Unload & Analyze" button.
-
I uploaded zip file as a name
test.zip. -
I used an intercepting proxy tool while uploading a file and changed the value of the filename parameter from
test.zipto<image src onerror=prompt(document.domain)>test.zip. This means I uploaded a file and set its name to a script value. As a result, the server allowed the file to be uploaded successfully. -
I accessed /recent_scans/ and found a file named
<image src onerror=prompt(document.domain)>test.zipin the recent scans. Then, I clicked on the "Differ or Compare" button." -
I found that the application requires selecting a file to compare, and I selected the file
<image src onerror=prompt(document.domain)>test.zip -
I found that the JavaScript in the filename value was executed in the web browser.
Impact
Allowing a malicious user to upload a script in the filename parameter can be used to steal information from other users or administrators when they perform the compare functionality. The script will be stored in the system permanently in this vulnerability.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | mobsf | all versions | 4.2.9 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mobsf. 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 mobsf to 4.2.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5jc6-h9w7-jm3p 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-5jc6-h9w7-jm3p 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-5jc6-h9w7-jm3p. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-5jc6-h9w7-jm3p in your dependencies?
O3 detects GHSA-5jc6-h9w7-jm3p across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.