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MEDIUM severity

botframework-connector vulnerable to Improper AuthenticationGHSA-fvcj-hvfw-7f2v

MEDIUM

GHSA-fvcj-hvfw-7f2v is a medium-severity (CVSS 5.5) Improper Authentication vulnerability in botframework-connector. A fix is available for botframework-connector — see the affected versions and patch details below.

Also known asCVE-2021-1725GHSA-cqff-fx2x-p86vPYSEC-2021-422
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.1%probability of exploitation in next 30 days
Lower Risk+0.02%
Lower risk than most CVEs64th percentile — riskier than 64% of all scored CVEsHighest risk
0.02%0.54%1.06%1.57%0.5%1.1%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-fvcj-hvfw-7f2v 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

4 pkgs affected
📦botframework-connector📦botframework-connector📦botframework-connector📦botframework-connector

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

Description

Impact

A maliciously crafted claim may be incorrectly authenticated by the bot. Impacts bots that are not configured to be used as a Skill. This vulnerability requires an attacker to have internal knowledge of the bot.

Patches

The problem has been patched in all affected versions. Please see the list of patched versions for the most appropriate one for your individual case.

Workarounds

Users who do not wish or are not able to upgrade can add an authentication configuration containing ClaimsValidator, which throws an exception if the Claims are Skill Claims.

For detailed instructions, see the link in the References section.

For more information

If you have any questions or comments about this advisory:

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
📦npmbotframework-connector≥ 4.7.0&&< 4.7.34.7.3npm install botframework-connector@4.7.3
📦npmbotframework-connector≥ 4.8.0&&< 4.8.14.8.1npm install botframework-connector@4.8.1
📦npmbotframework-connector≥ 4.9.0&&< 4.9.44.9.4npm install botframework-connector@4.9.4
📦npmbotframework-connector≥ 4.10.0&&< 4.10.34.10.3npm install botframework-connector@4.10.3

Affected Products

1 product · 3 configurations
Application
bot framework software development kitmicrosoft
all

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update botframework-connector to 4.7.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-fvcj-hvfw-7f2v is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

### Impact A maliciously crafted claim may be incorrectly authenticated by the bot. Impacts bots that are not configured to be used as a Skill. This vulnerability requires an attacker to have internal knowledge of the bot. ### Patches The problem has been patched in all affected versions. Please see the list of patched versions for the most appropriate one for your individual case. ### Workarounds Users who do not wish or are not able to upgrade can add an authentication configuration containing ClaimsValidator, which throws an exception if the Claims are Skill Claims. For detailed instruct
O3 Security · Impact-Aware SCA

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botframework-connector vulnerable to Improper…