CVE-2021-35955: Cross site scripting via HTML attributes in the back end

CVE-2021-35955 · Severity: low · CVSS 3.1 · Published 2021-08-25

Cross site scripting via HTML attributes in the back end

Technologies: contao/contao (Packagist), contao/core-bundle (Packagist). Vendors: Packagist.

Quick answers

Is CVE-2021-35955 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2021-35955 being exploited in the wild.
How severe is CVE-2021-35955?
Low severity, with a CVSS score of 3.1, published 25 August 2021.
Which products and versions are affected?
contao/contao (Packagist) ECOSYSTEM:introduced=4.0.0,fixed=4.4.56; contao/core-bundle (Packagist) ECOSYSTEM:introduced=4.0.0,fixed=4.4.56.
Is there a fix for CVE-2021-35955?
Yes. contao/contao (Packagist): upgrade to 4.4.56 or later; contao/core-bundle (Packagist): upgrade to 4.4.56 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2021-35955?
Check whether you run contao/contao (Packagist) or contao/core-bundle (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • contao/contao (Packagist): upgrade to 4.4.56 or later
    composer require contao/contao:^4.4.56
  • contao/core-bundle (Packagist): upgrade to 4.4.56 or later
    composer require contao/core-bundle:^4.4.56

Affected products

  • contao/contao (Packagist) ECOSYSTEM:introduced=4.0.0,fixed=4.4.56
  • contao/core-bundle (Packagist) ECOSYSTEM:introduced=4.0.0,fixed=4.4.56

Identifiers

  • CVE-2021-35955
  • GHSA-hr3h-x6gq-rqcp

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