CVE-2020-29041: A misconfiguration in Web-Sesame 2020.1.1.3375 allows an unauthenticated attacker to download the source code

This week

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2020-29041 is a medium-severity flaw (CVSS 5.3) affecting web-sesame. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A misconfiguration in Web-Sesame 2020.1.1.3375 allows an unauthenticated attacker to download the source code of the application, facilitating its comprehension (code review). Specifically, JavaScript source maps were inadvertently included in the production Webpack configuration. These maps contain sources used to generate the bundle, configuration settings (e.g., API keys), and developers' comments.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Published	2021-01-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sesame-system

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-01-06 21:15 UTCPublished CVE record published
2026-06-17 03:11 UTCUpdated Record last modified

sesame-system web-sesame DOWNGRADE

Affected: 2020.1.1.3375

Fixed in: no fixed release known

Safe to downgrade to: a release before 2020.1.1.3375

1. Check installed version

apt-cache policy web-sesame || rpm -q web-sesame || web-sesame --version

2. No fixed release: DOWNGRADE to a release before 2020.1.1.3375 (Debian / Ubuntu)

apt-cache madison web-sesame sudo apt install web-sesame=<VERSION_BEFORE_2020.1.1.3375> sudo apt-mark hold web-sesame

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list web-sesame sudo dnf downgrade web-sesame-<VERSION_BEFORE_2020.1.1.3375> sudo dnf versionlock add web-sesame

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-29041?

web-sesame: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-29041 being exploited?

CVE-2020-29041 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-29041 affect?

CVE-2020-29041 affects web-sesame. Severity is medium (CVSS 5.3). A misconfiguration in Web-Sesame 2020.1.1.3375 allows an unauthenticated attacker to download the source code of the application, facilitating its comprehension (code review). Specifically, JavaScript source maps were inadvertently included

How urgent is CVE-2020-29041?

Priority 47/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Webpack vulnerabilities

References

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