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CVE-2026-120212 Cross-site Scripting

no score yetEPSS 0.2%

No CVSS score yet. EPSS 0.2% estimated probability of exploitation activity in the next 30 days.

On this page
Web::Simple versions before 0.037 for Perl do not escape single quotes in HTML::Tags output. HTML::Tags and XML::Tags escape a plain string value by replacing only &, ", < and > with entities. A value interpolated into a single-quoted attribute, as in <a href='$value'>, can therefore close the attribute and add new ones, such as an event handler. Double-quoted attributes are not affected. An attacker who controls a value that an application interpolates into a single-quoted attribute can inject script into the generated page.
EPSS
0.2% estimated probability of exploitation activity in the next 30 days; 12th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CWE
CWE-79 Improper Neutralization of Input During Web Page Generation (Cross-site Scripting)
OWASP Top 10
A05:2025 Injection
Published
Modified
Assigned by
CPANSec (CNA)
NVD analysis
Deferred: the NVD does not plan to analyze it
Record from
the NVD, synced

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CVE-2026-120212

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Linux distributions

DistributionReleasePackageFixed inAdvisory
Debian12, 13, 14libweb-simple-perlno fix listedDEBIAN-CVE-2026-120212
Ubuntu16.04:LTS, 18.04:LTS, 20.04:LTS and 4 morelibweb-simple-perlno fix listedUBUNTU-CVE-2026-120212

From the distributions' data via OSV.dev: the Debian Security Tracker; Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Debian · Ubuntu.

Attack patterns (CAPEC)

  • CAPEC-63 Cross-Site Scripting (XSS) Likelihood: High · Severity: Very High
  • CAPEC-85 AJAX Footprinting Likelihood: High · Severity: Low
  • CAPEC-209 XSS Using MIME Type Mismatch Severity: Medium
  • CAPEC-588 DOM-Based XSS Likelihood: High · Severity: Very High
  • CAPEC-591 Reflected XSS Likelihood: High · Severity: Very High
  • CAPEC-592 Stored XSS Likelihood: High · Severity: Very High

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

History

  1. The NVD deferred its analysis

Changes since this site first stored the record. The same for every record: /api/public/changes.

References

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