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NVD / CVE Program· CNA GitHub_M

CVE-2020-26227: Cross-Site Scripting in Fluid view helpers

MediumCVSS 6.1 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.72% (FIRST EPSS); higher than 54.5% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: typo3/cms (Packagist) 10.4.10, 8.7.38, 9.5.23; typo3/cms-core (Packagist) 10.4.10, 8.7.38, 9.5.23.

Low priority for now. Upgrade to typo3/cms (Packagist) 10.4.10, 8.7.38, 9.5.23; typo3/cms-core (Packagist) 10.4.10, 8.7.38, 9.5.23 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 9.5.23 and 10.4.10 the system extension Fluid (typo3/cms-fluid) of the TYPO3 core is vulnerable to cross-site scripting passing user-controlled data as argument to Fluid view helpers. Update to TYPO3 versions 9.5.23 or 10.4.10 that fix the problem described.

Published
Nov 23, 2020
Updated
Jun 16, 2026
EPSS
0.7% · 54th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CNA vs NVD score

NVD
6.1
CNA · GitHub_M
6.1
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
typo3typo3

Limit the impact of XSS

This is a cross-site scripting (XSS) vulnerability. A well-configured Content-Security-Policy doesn't fix it, but greatly reduces its impact. Check your site's CSP and other security headers for free.

Check security headers

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • TYPO3 TYPO3.CMS

    • >= 9.0.0, < 9.5.23, >= 10.0.0, < 10.4.10affected
Affected versions · NVD (5)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • typo3 typo36.2.0 and later · before 6.2.54
  • typo3 typo37.6.0 and later · before 7.6.48
  • typo3 typo38.7.0 and later · before 8.7.38
  • typo3 typo39.0.0 and later · before 9.5.23
  • typo3 typo310.0.0 and later · before 10.4.10

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Packagisttypo3/cmsfrom 10.0.0 · before 10.4.1010.4.10
Packagisttypo3/cmsfrom 8.7.0 · before 8.7.388.7.38
Packagisttypo3/cmsfrom 9.0.0 · before 9.5.239.5.23
Packagisttypo3/cms-corefrom 10.0.0 · before 10.4.1010.4.10
Packagisttypo3/cms-corefrom 8.7.0 · before 8.7.388.7.38
Packagisttypo3/cms-corefrom 9.0.0 · before 9.5.239.5.23

Same product

typo3: all records

Other highest-scoring records for the same primary product.

  • CVE-2009-0255The System extension Install tool in TYPO3 4.0.0 through 4.0.9, 4.1.0 through 4.1.7, and 4.2.0 through 4.2.3 creates the encryption key…
    60This week
  • CVE-2013-6288Unspecified vulnerability in the Apache Solr for TYPO3 (solr) extension before 2.8.3 for TYPO3 has unknown impact and remote attack…
    41Plan
  • CVE-2013-5303Unspecified vulnerability in the Store Locator (locator) extension before 3.1.5 for TYPO3 has unknown impact and remote attack vectors…
    41Plan

Published before and after this one in the same product

  • ← EarlierCVE-2020-15098Jul 29, 2020 · Missing Required Cryptographic Step Leading to Sensitive Information Disclosure in TYPO3 CMS
    36Monitor
  • ← EarlierCVE-2020-15099Jul 29, 2020 · Exposure of Sensitive Information to an Unauthorized Actor in TYPO3 CMS
    33Monitor
  • Later →CVE-2020-26228Nov 23, 2020 · Cleartext storage of session identifier
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Packagist:typo3/cms10.4.10Package registry (OSV)
Packagist:typo3/cms8.7.38Package registry (OSV)
Packagist:typo3/cms9.5.23Package registry (OSV)
Packagist:typo3/cms-core10.4.10Package registry (OSV)
Packagist:typo3/cms-core8.7.38Package registry (OSV)
Packagist:typo3/cms-core9.5.23Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

nvd-primary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

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