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Fencer Vulns
high 8.0

CVE-2020-26216 json

Cross-Site Scripting in TYPO3 Fluid

published 2020-11-17 5 y ago modified 2026-07-08 4 mo ago also GHSA-hpjm-3ww5-6cpf , EUVD-2020-1457

cvss
8.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits
0
none known

Summary

TYPO3 Fluid before versions 2.0.8, 2.1.7, 2.2.4, 2.3.7, 2.4.4, 2.5.11 and 2.6.10 is vulnerable to Cross-Site Scripting. Three XSS vulnerabilities have been detected in Fluid: 1. TagBasedViewHelper allowed XSS through maliciously crafted additionalAttributes arrays by creating keys with attribute-closing quotes followed by HTML. When rendering such attributes, TagBuilder would not escape the keys. 2. ViewHelpers which used the CompileWithContentArgumentAndRenderStatic trait, and which declared escapeOutput = false, would receive the content argument in unescaped format. 3. Subclasses of AbstractConditionViewHelper would receive the then and else arguments in unescaped format. Update to versions 2.0.8, 2.1.7, 2.2.4, 2.3.7, 2.4.4, 2.5.11 or 2.6.10 of this typo3fluid/fluid package that fix the problem described. More details are available in the linked advisory.

Patch / fix

  • packagist typo3fluid/fluid 2.0.8, 2.1.7, 2.2.4, 2.3.7, 2.4.4, 2.5.11, 2.6.10
  • typo3 fluid 2.0.8, 2.1.7, 2.2.4, 2.3.7, 2.4.4, 2.5.11, 2.6.10

Exploit prediction

1.04% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/TYPO3/Fluid/security/advisories/GHSA-hpjm-3ww5-6cpf referenced PoC, tagged "exploit" by a source, unverified
  • typo3.org https://typo3.org/security/advisory/typo3-core-sa-2020-009 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub 3.1 8.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
packagist typo3fluid/fluid
>=2.0.0, <2.0.8
>=2.1.0, <2.1.7
>=2.2.0, <2.2.4
>=2.3.0, <2.3.7
>=2.4.0, <2.4.4
>=2.5.0, <2.5.11
>=2.6.0, <2.6.10
2.0.8
2.1.7
2.2.4
2.3.7
2.4.4
2.5.11
2.6.10

Affected products

  • TYPO3 Fluid

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns 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.