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Fencer Vulns
medium 6.1

CVE-2026-28222 json

Wagtail: Improper escaping of HTML (Cross-site Scripting) on TableBlock class attributes

published 2026-03-03 8 mo ago modified 2026-07-13 3 mo ago also EUVD-2026-9858 , GHSA-p5cm-246w-84jm , PYSEC-2026-2307

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

Wagtail is an open source content management system built on Django. Prior to versions 6.3.8, 7.0.6, 7.2.3, and 7.3.1, a stored cross-site scripting (XSS) vulnerability exists on rendering TableBlock blocks within a StreamField. A user with access to create or edit pages containing TableBlock StreamField blocks is able to set specially-crafted class attributes on the block which run arbitrary JavaScript code when the page is viewed. When viewed by a user with higher privileges, this could lead to performing actions with that user's credentials. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin, and only affects sites using TableBlock. This issue has been patched in versions 6.3.8, 7.0.6, 7.2.3, and 7.3.1.

Patch / fix

  • pypi wagtail 6.3.8, 7.0.6, 7.2.3, 7.3.1
  • torchbox wagtail 6.3.8, 7.0.6, 7.2.3, 7.3.1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
8 mo ago

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N
GitHub 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N
OSV 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
pypi wagtail
<6.3.8
>=6.4rc1, <7.0.6
>=7.1rc1, <7.2.3
>=7.3rc1, <7.3.1
>=6.4, <7.0.6
>=7.1, <7.2.3
6.3.8
7.0.6
7.2.3
7.3.1

Affected products

  • wagtail wagtail

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.