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Fencer Intel
no cvss —

CVE-2026-125729 json

Plack::Middleware::CSP versions before 0.03 for Perl send the Content Security Policy under the wrong header name, so browsers never enforce it

published yesterday modified yesterday also EUVD-2026-121395

cvss
—
not scored
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

Plack::Middleware::CSP versions before 0.03 for Perl send the Content Security Policy under the wrong header name, so browsers never enforce it.

The call method sets the policy in a response header named "content-security-protocol" instead of "Content-Security-Policy". Browsers ignore that header.

Any cross-site scripting flaw in the wrapped application can run scripts the policy was meant to block.

Patch / fix

  • cpan Plack-Middleware-CSP 0.03

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Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-11).

Affected products

  • cpan Plack-Middleware-CSP

Classification

Weakness
  • CWE-684 Incorrect Provision of Specified Functionality

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.