Kaltura HTML5 Video Player up to 2.103 html5lib mwEmbedLoader.php ServiceUrl input validation

Summaryinfo

A vulnerability has been found in Kaltura HTML5 Video Player up to 2.103 and classified as problematic. This affects an unknown function of the file mwEmbedLoader.php of the component html5lib. Performing a manipulation of the argument ServiceUrl results in input validation. This vulnerability is cataloged as CVE-2026-19913. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Kaltura HTML5 Video Player up to 2.103. This affects an unknown part of the file mwEmbedLoader.php of the component html5lib. The manipulation of the argument ServiceUrl with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality. The summary by CVE is:

The Kaltura HTML5 player (mwEmbed / html5lib) contains a local file disclosure vulnerability due to improper validation of the ServiceUrl parameter in mwEmbedLoader.php. This parameter is used as the base URL for a backend request and accepts non‑HTTP schemes such as file://. When an exception or error occurs, the response is subsequently deserialized and its raw contents are reflected to the client in an error message; this enables an unauthenticated, remote attacker to read any arbitrary internal file reachable by the server. Affected versions include html5lib v2.45, v2.103 and earlier, and other v2.x releases exposing the vulnerable endpoint.

It is possible to read the advisory at kb.cert.org. This vulnerability is uniquely identified as CVE-2026-19913 since 08/14/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/25/2026).

By approaching the search of inurl:mwEmbedLoader.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Multimedia Player Software

Vendor

• Kaltura

Name

• HTML5 Video Player

Version

• 2.103

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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