# CVE-2026-121632: Data::MuForm versions through 0.05 for Perl render attribute values and option labels into HTML without escaping

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

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.

## Remediation

- fix: No fixed CPAN release is currently available. Apply the patch. (source: CNA: CPANSec)

## Affected products and versions

-  /  (Data-MuForm): ≥ 0; ≤ 0.05 (affected, custom). Source: CNA: CPANSec

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-79

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/gshank/data-muform/pull/18 (CNA: CPANSec; issue-tracking)

- https://metacpan.org/release/GSHANK/Data-MuForm-0.05/source/lib/Data/MuForm/Renderer/Base.pm#L202-228 (CNA: CPANSec)

## Provenance

- CNA: CPANSec: https://www.cve.org/CVERecord?id=CVE-2026-121632; retrieved 2026-11-04; source updated 2026-11-04

Revision: 3e7329f1efbbcc31607a18043438d43b403099c0d32ec36d5dea81ec82363783

Canonical: https://y2.dev/cve/CVE-2026-121632

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