MuForm up to 0.05 Render process_attrs escape output

Summaryinfo

A vulnerability was found in MuForm up to 0.05. It has been classified as critical. Affected by this vulnerability is the function process_attrs of the component Render. Performing a manipulation results in escape output. This vulnerability is cataloged as CVE-2026-121632. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in MuForm up to 0.05. It has been classified as critical. This affects the function process_attrs of the component Render. The manipulation with an unknown input leads to a escape output vulnerability. CWE is classifying the issue as CWE-116. The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Data::MuForm versions through 0.05 for Perl render attribute values and option labels into HTML without escaping. process_attrs writes each attribute value into the markup as is. The select, radio group and checkbox group renderers pass each option to it, so an option's value becomes an unescaped attribute. Option and option group labels are also unescaped, the group label inside a label attribute and the others in element content. Any application whose option list is built from data rather than literals, using an options_<field_name> method, a build_options method or a DBIC model, allows attacker-influenced text in an option value or label that can embed JavaScript in rendered pages. Attribute values built from data, such as through element_attr, are affected the same way.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-121632 since 11/03/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. 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 11/04/2026).

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

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Productinfo

Name

• MuForm

Version

• 0.05

CPE 2.3info

• 🔒

CPE 2.2info

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