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CVE-2026-109597

Hugo v0.60.0 before v0.167.0 Stored XSS via Table of Contents Heading IDs

5.1 MediumFix available

Hugo from v0.60.0 before v0.167.0 contains a stored cross-site scripting vulnerability that allows Markdown content authors to inject HTML by supplying crafted explicit heading IDs. Attackers can break out of the unescaped href attribute in .TableOfContents or .Fragments.ToHTML output to inject elements with event handlers into rendered pages.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
Passive

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
None

Exploit likelihood

0.17%Unchanged since Oct 13, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.1

Hugo v0.60.0 before v0.167.0 Stored XSS via Table of Contents Heading IDs

Hugo from v0.60.0 before v0.167.0 contains a stored cross-site scripting vulnerability that allows Markdown content authors to inject HTML by supplying crafted explicit heading IDs. Attackers can break out of the unescaped href attribute in .TableOfContents or .Fragments.ToHTML output to inject elements with event handlers into rendered pages.

Record
CVE-2026-109597
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
EUVDEUVD-2026-98160 5.1

Hugo from v0.60.0 before v0.167.0 contains a stored cross-site scripting vulnerability that allows Markdown content authors to inject HTML by supplying crafted explicit heading IDs. Attackers can break out of the unescaped href attribute in .TableOfContents or .Fragments.ToHTML output to inject elements with event handlers into rendered pages.

Record
EUVD-2026-98160
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-hh58-7hgh-xf3r 5.1

Hugo from v0.60.0 before v0.167.0 contains a stored cross-site scripting vulnerability that...

Hugo from v0.60.0 before v0.167.0 contains a stored cross-site scripting vulnerability that allows Markdown content authors to inject HTML by supplying crafted explicit heading IDs. Attackers can break out of the unescaped href attribute in .TableOfContents or .Fragments.ToHTML output to inject elements with event handlers into rendered pages.

Record
GHSA-hh58-7hgh-xf3r
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
NVD 5.1

Hugo from v0.60.0 before v0.167.0 contains a stored cross-site scripting vulnerability that allows Markdown content authors to inject HTML by supplying crafted explicit heading IDs. Attackers can break out of the unescaped href attribute in .TableOfContents or .Fragments.ToHTML output to inject elements with event handlers into rendered pages.

Record
CVE-2026-109597
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
OSV 5.1

Hugo v0.60.0 before v0.167.0 Stored XSS via Table of Contents Heading IDs

Hugo from v0.60.0 before v0.167.0 contains a stored cross-site scripting vulnerability that allows Markdown content authors to inject HTML by supplying crafted explicit heading IDs. Attackers can break out of the unescaped href attribute in .TableOfContents or .Fragments.ToHTML output to inject elements with event handlers into rendered pages.

Record
CVE-2026-109597
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness
CWE-79
Updated
2026-11-02
OSVDEBIAN-CVE-2026-109597 5.1

Hugo from v0.60.0 before v0.167.0 contains a stored cross-site scripting vulnerability that allows Markdown content authors to inject HTML by supplying crafted explicit heading IDs. Attackers can break out of the unescaped href attribute in .TableOfContents or .Fragments.ToHTML output to inject elements with event handlers into rendered pages.

Record
DEBIAN-CVE-2026-109597
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-02
OSVRHSA-2026:80677 5.9

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:80677
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-109597 5.1

Hugo from v0.60.0 before v0.167.0 contains a stored cross-site scripting vulnerability that allows Markdown content authors to inject HTML by supplying crafted explicit heading IDs. Attackers can break out of the unescaped href attribute in .TableOfContents or .Fragments.ToHTML output to inject elements with event handlers into rendered pages.

Record
UBUNTU-CVE-2026-109597
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
hugo
Debian:12
 All versions, plus listed versions
0.111.3-10.112.7-10.113.0-10.113.0-20.113.0-3
Show 45 moreShow less
0.114.1-10.114.1-20.115.4-10.116.1-10.117.0-10.118.2-10.119.0-10.119.0-20.120.3-10.120.4-10.121.1-10.121.2-10.122.0-10.123.3-10.123.7-10.123.8-10.123.8-20.124.1-10.125.4-10.125.5-10.125.6-10.125.7-10.126.1-10.126.2-10.126.3-10.127.0-10.128.2-10.128.2-20.129.0-10.129.0-20.130.0-10.130.0-20.131.0-10.131.0-20.150.0-10.150.1-10.151.0-10.151.1-10.151.2-10.152.1-10.152.2-10.153.0-10.153.1-10.153.1-20.153.1-3
 None known
hugo
Debian:13
 All versions, plus listed versions
0.131.0-10.131.0-20.150.0-10.150.1-10.151.0-1
Show 45 moreShow less
0.151.1-10.151.2-10.152.1-10.152.2-10.153.0-10.153.1-10.153.1-20.153.1-30.153.2-10.154.1-10.154.2-10.154.2-20.154.3-10.154.5-10.155.1-10.155.2-10.155.3-10.157.0-10.157.0-20.157.0-30.158.0-10.158.0-20.158.0-30.159.0-10.159.1-10.159.2-10.160.0-10.160.0-20.160.1-10.161.0-10.161.1-10.162.1-10.162.1-20.162.1-30.162.1-40.162.1-50.162.1-60.162.1-70.165.0-10.165.0-20.165.0-30.166.0-10.166.0-20.167.0-10.167.0-2
 None known
hugo
Debian:14
 before 0.167.0-1, plus listed versions
0.131.0-10.131.0-20.150.0-10.150.1-10.151.0-1
Show 43 moreShow less
0.151.1-10.151.2-10.152.1-10.152.2-10.153.0-10.153.1-10.153.1-20.153.1-30.153.2-10.154.1-10.154.2-10.154.2-20.154.3-10.154.5-10.155.1-10.155.2-10.155.3-10.157.0-10.157.0-20.157.0-30.158.0-10.158.0-20.158.0-30.159.0-10.159.1-10.159.2-10.160.0-10.160.0-20.160.1-10.161.0-10.161.1-10.162.1-10.162.1-20.162.1-30.162.1-40.162.1-50.162.1-60.162.1-70.165.0-10.165.0-20.165.0-30.166.0-10.166.0-2
0.167.0-1
hugo
Red Hat:hummingbird:1
From an advisory covering 5 CVEs
 before 0:0.167.0-0.2.hum1
0:0.167.0-0.2.hum1
hugo
Ubuntu:16.04:LTS
 All versions, plus listed versions
0.15+git20160109.147.dd1d655-10.15+git20160109.147.dd1d655-20.15+git20160128.179.5def6d9-10.15+git20160206.203.ed23711-1
 None known
hugo
Ubuntu:18.04:LTS
 All versions, plus listed versions
0.25.1-20.26-10.35-10.37.1-10.38-10.39-10.40-10.40.1-1
 None known
hugo
Ubuntu:20.04:LTS
 All versions, plus listed versions
0.57.2-10.58.3-10.59.1-1.10.68.3-1
 None known
hugo
Ubuntu:22.04:LTS
 All versions, plus listed versions
0.80.0-60.89.4-20.90.0-10.90.1-10.91.0-1
Show 5 moreShow less
0.91.2-10.92.0-10.92.1-1build10.92.2-10.92.2-1ubuntu0.1
 None known
hugo
Ubuntu:Pro:24.04:LTS
 All versions, plus listed versions
0.113.0-30.119.0-20.120.3-10.120.4-10.121.2-1
Show 8 moreShow less
0.122.0-10.123.7-1build10.123.7-1ubuntu0.10.123.7-1ubuntu0.20.123.7-1ubuntu0.2+esm10.123.7-1ubuntu0.30.123.7-1ubuntu0.3+esm10.123.7-1ubuntu0.3+esm2
 None known
hugo
Ubuntu:26.10
 All versions, plus listed versions
0.154.5-10.162.1-50.162.1-7
 None known
hugo
Ubuntu:26.04:LTS
 All versions, plus listed versions
0.131.0-10.152.2-10.153.1-30.153.2-10.154.2-20.154.3-10.154.5-1
 None known

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

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

In short

CVE-2026-109597 is a medium vulnerability (CVSS 5.1) in Gohugoio Hugo, published October 12, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 6th percentile. Fixed in hugo 0.167.0-1.

References

Show 33 moreShow less
This page doesn't list everything

Left out here: 47 versions. The JSON record has them.

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