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Not in CISA KEV
HIGH severity

CVE-2020-15277 — basercms

HIGHFix: baserproject/basercms@bb027c3

CVE-2020-15277 is a high-severity (CVSS 7.2) Unrestricted File Upload vulnerability in baserproject/basercms. A fix is available for baserproject/basercms — see the affected versions and patch details below.

Edit template, Remote Code Execution (RCE) Vulnerability in Latest Release 4.4.0

Also known asGHSA-6fmv-q269-55cw
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs83th percentile — riskier than 83% of all scored CVEsHighest risk
1.71%2.38%3.06%3.72%3.2%2.3%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2020-15277 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐘baserproject/basercms

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

Description

baserCMS 4.4.0 and earlier is affected by Remote Code Execution (RCE).

Impact: XSS via Arbitrary script execution. Attack vector is: Administrator must be logged in. Components are: Edit template. Tested baserCMS Version : 4.4.0 (Latest) Affected baserCMS Version : 4.0.0 ~ 4.4.0 Patches : https://basercms.net/security/20201029 Found by Aquilao Null

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistbaserproject/basercms≥ 4.4.0&&< 4.4.14.4.1composer require baserproject/basercms:^4.4.1

Affected Products

1 product · 1 configurations
Application
basercmsbasercms
≥ 4.0.0 && < 4.4.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update baserproject/basercms to 4.4.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-15277 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

baserCMS 4.4.0 and earlier is affected by Remote Code Execution (RCE). Impact: XSS via Arbitrary script execution. Attack vector is: Administrator must be logged in. Components are: Edit template. Tested baserCMS Version : 4.4.0 (Latest) Affected baserCMS Version : 4.0.0 ~ 4.4.0 Patches : https://basercms.net/security/20201029 Found by Aquilao Null
O3 Security · Impact-Aware SCA

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CVE-2020-15277: basercms RCE — Fixed in 4.4.1