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MEDIUM severity

CVE-2019-16355 — beego

MEDIUMFix: beego/beego#3975

CVE-2019-16355 is a medium-severity (CVSS 5.5) Incorrect Default Permissions vulnerability in github.com/beego/beego. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for github.com/beego/beego — see the affected versions and patch details below.

Beego has a file creation race condition

Also known asCVE-2019-16354GHSA-f6px-w8rh-7r89GHSA-hf4p-4j9r-3cvxGO-2021-0084
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
1 known
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs30th percentile — riskier than 30% of all scored CVEsHighest risk
0.00%0.29%0.57%0.86%0.0%0.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐹github.com/beego/beego🐹github.com/astaxie/beego

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

The File Session Manager in Beego 1.10.0 allows local users to read session files because there is a race condition involving file creation within a directory with weak permissions.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/beego/beegoall versions1.12.2go get github.com/beego/beego@v1.12.2
🐹Gogithub.com/astaxie/beegoall versions1.12.2go get github.com/astaxie/beego@v1.12.2

Affected Products

1 product · 1 configurations
Application
beegobeego
1 version
1.10.0
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

The File Session Manager in Beego 1.10.0 allows local users to read sess…

github.comNVDSep 2019

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/beego/beego, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/beego/beego to 1.12.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-16355 is resolved across your whole dependency graph.

  3. Workarounds

    Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable.

Frequently Asked Questions

The File Session Manager in Beego 1.10.0 allows local users to read session files because there is a race condition involving file creation within a directory with weak permissions.
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CVE-2019-16355: beego — Fixed in 1.12.2