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CVE-2026-120643

CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in URLs returned by url and self_url

No score

CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in URLs returned by url and self_url.

Both pass the URL through URI's canonical method, which leaves an apostrophe in the path raw and decodes the %27 that query parameter escaping produces, so an apostrophe in the request path or a parameter appears raw in the result.

An application that places the URL in a single-quoted HTML attribute or JavaScript string is open to cross-site scripting.

Exploit likelihood

0.21%Unchanged since Nov 4, 2026
90%50%10%1%

What each source reports

CVE List No score

CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in URLs returned by url and self_url

CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in URLs returned by url and self_url.

Both pass the URL through URI's canonical method, which leaves an apostrophe in the path raw and decodes the %27 that query parameter escaping produces, so an apostrophe in the request path or a parameter appears raw in the result.

An application that places the URL in a single-quoted HTML attribute or JavaScript string is open to cross-site scripting.

Record
CVE-2026-120643
Weakness
CWE-79
Updated
2026-11-04
EUVDEUVD-2026-116610 No score

CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in URLs returned by url and self_url.

Both pass the URL through URI's canonical method, which leaves an apostrophe in the path raw and decodes the %27 that query parameter escaping produces, so an apostrophe in the request path or a parameter appears raw in the result.

An application that places the URL in a single-quoted HTML attribute or JavaScript string is open to cross-site scripting.

Record
EUVD-2026-116610
Updated
2026-11-04
GitHub AdvisoriesGHSA-c4m8-3x4v-gcxr No score

CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in...

CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in URLs returned by url and self_url.

Both pass the URL through URI's canonical method, which leaves an apostrophe in the path raw and decodes the %27 that query parameter escaping produces, so an apostrophe in the request path or a parameter appears raw in the result.

An application that places the URL in a single-quoted HTML attribute or JavaScript string is open to cross-site scripting.

Record
GHSA-c4m8-3x4v-gcxr
Weakness
CWE-79
Updated
2026-11-04
NVD No score

CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in URLs returned by url and self_url.

Both pass the URL through URI's canonical method, which leaves an apostrophe in the path raw and decodes the %27 that query parameter escaping produces, so an apostrophe in the request path or a parameter appears raw in the result.

An application that places the URL in a single-quoted HTML attribute or JavaScript string is open to cross-site scripting.

Record
CVE-2026-120643
Weakness
CWE-79
Updated
2026-11-04
OSV No score

CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in URLs returned by url and self_url

CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in URLs returned by url and self_url.

Both pass the URL through URI's canonical method, which leaves an apostrophe in the path raw and decodes the %27 that query parameter escaping produces, so an apostrophe in the request path or a parameter appears raw in the result.

An application that places the URL in a single-quoted HTML attribute or JavaScript string is open to cross-site scripting.

Record
CVE-2026-120643
Weakness
CWE-79
Updated
2026-11-07
OSVDEBIAN-CVE-2026-120643 No score

CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in URLs returned by url and self_url. Both pass the URL through URI's canonical method, which leaves an apostrophe in the path raw and decodes the %27 that query parameter escaping produces, so an apostrophe in the request path or a parameter appears raw in the result. An application that places the URL in a single-quoted HTML attribute or JavaScript string is open to cross-site scripting.

Record
DEBIAN-CVE-2026-120643
Updated
2026-11-05
OSVopenSUSE-SU-2026:12465-1 No score

perl-CGI-5.20.0-1.1 on GA media

These are all security issues fixed in the perl-CGI-5.20.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:12465-1
Updated
2026-11-07
OSVUBUNTU-CVE-2026-120643 No score

CGI versions from 4.62 before 5.00 for Perl allow cross-site scripting via a raw apostrophe in URLs returned by url and self_url. Both pass the URL through URI's canonical method, which leaves an apostrophe in the path raw and decodes the %27 that query parameter escaping produces, so an apostrophe in the request path or a parameter appears raw in the result. An application that places the URL in a single-quoted HTML attribute or JavaScript string is open to cross-site scripting.

Record
UBUNTU-CVE-2026-120643
Updated
2026-11-05

Affected packages

Affected packages
PackageAffectedFixed
libcgi-pm-perl
Debian:12
All versions, plus listed versions
4.55-14.57-14.59-14.60-14.61-1
Show 11 moreShow less
4.62-14.63-14.64-14.65-14.66-14.67-14.68-14.70-14.71-14.72-15.02-1
None known
libcgi-pm-perl
Debian:13
All versions, plus listed versions
4.68-14.70-14.71-14.72-15.02-1
None known
libcgi-pm-perl
Debian:14
All versions, plus listed versions
4.68-14.70-14.71-14.72-15.02-1
None known
libcgi-pm-perl
Ubuntu:16.04:LTS
All versions, plus listed versions
4.21-14.22-14.25-14.26-1
None known
libcgi-pm-perl
Ubuntu:18.04:LTS
All versions, plus listed versions
4.36-14.37-14.38-1
None known
libcgi-pm-perl
Ubuntu:20.04:LTS
All versions, plus listed versions
4.44-14.45-14.46-1
None known
libcgi-pm-perl
Ubuntu:22.04:LTS
All versions, plus listed versions
4.51-14.53-14.54-1
None known
libcgi-pm-perl
Ubuntu:24.04:LTS
All versions, plus listed versions
4.57-14.60-14.61-14.62-14.63-1
None known
libcgi-pm-perl
Ubuntu:26.10
All versions, plus listed versions
4.71-1build14.72-1
None known
libcgi-pm-perl
Ubuntu:26.04:LTS
All versions, plus listed versions
4.68-14.71-14.71-1build1
None known
perl-CGI
openSUSE:Tumbleweed
From an advisory covering 20 CVEs
before 5.20.0-1.1
5.20.0-1.1

History

History
RecordedChangedSources
affected, aliases, referencesOSV
affected, aliases, referencesNVD, OSV
referencesOSV
affected, aliases, referencesOSV
aliasesEUVD, NVD
first indexedCVE List, GitHub Advisories

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-120643 is a vulnerability with no CVSS score yet in libcgi-pm-perl, published November 3, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.21%, the 11th percentile. No source names a fixed version.

References

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