GHSA-f2p5-j6fg-5cxf

Suggest an improvement
Source
https://github.com/advisories/GHSA-f2p5-j6fg-5cxf
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-f2p5-j6fg-5cxf/GHSA-f2p5-j6fg-5cxf.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-f2p5-j6fg-5cxf
Aliases
Published
2026-08-20T18:40:13Z
Modified
2026-08-20T18:45:13Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
Wagtail: Denial of service via unbounded filter specs in the image preview
Details

Impact

An authenticated admin user can trigger expensive rendition processing with purposefully crafted filter specs resulting in potentially service degradation.

The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin.

Patches

Patched versions have been released as Wagtail 7.0.8, 7.3.3, 7.4.2.

Workarounds

For sites that cannot easily upgrade to a current supported version, the vulnerability can be patched by adding the following code to urls.py URL pattern declarations to override the vulnerable view.

from django.core.exceptions import PermissionDenied
from django.http import HttpResponseBadRequest
from django.shortcuts import get_object_or_404
from django.urls import path
from wagtail.admin import urls as wagtailadmin_urls
from wagtail.images.exceptions import InvalidFilterSpecError
from wagtail.images.permissions import permission_policy
from wagtail.images.views import preview


def patched_preview(request, image_id, filter_spec):
    image = get_object_or_404(get_image_model(), id=image_id)

    if not permission_policy.user_has_permission_for_instance(request.user, "change", image):
        raise PermissionDenied

    try:
        filter_obj = Filter(spec=filter_spec)
    except InvalidFilterSpecError:
        return HttpResponseBadRequest("Invalid filter spec", content_type="text/plain")

    allowed = {"original", "width", "height", "min", "max", "fill"}
    if any(operation.method not in allowed for operation in filter_obj.operations):
        return HttpResponseBadRequest("Invalid filter spec", content_type="text/plain")

    return preview(request, image_id, filter_spec)


urlpatterns = [
    # Example where the CMS admin is at /admin/.
    # Add this before the Wagtail admin URLs registration, with the same sub-path.
    path("admin/images/<int:image_id>/preview/<str:filter_spec>/", patched_preview)
    path("admin/", include(wagtailadmin_urls)),
]

Acknowledgements

Many thanks to @0x1saac for reporting this issue.

For more information

If you have any questions or comments about this advisory:

Database specific 
{
    "cwe_ids":  [
        "CWE-400"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-08-20T18:40:13Z",
    "nvd_published_at":  "2026-07-01T22:16:49Z",
    "severity":  "MODERATE"
}
References

Affected packages

PyPI / wagtail

Package

Name
wagtail
View open source insights on deps.dev
Purl
pkg:pypi/wagtail

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
7.0.8

Affected versions

0.*
0.1
0.2
0.3
0.3.1
0.4
0.4.1
0.5
0.6
0.7
0.8
0.8.1
0.8.2
0.8.3
0.8.4
0.8.5
0.8.6
0.8.7
0.8.8
0.8.9
0.8.10
1.*
1.0b1
1.0b2
1.0rc1
1.0rc2
1.0
1.1rc1
1.1
1.2rc1
1.2
1.3rc1
1.3
1.3.1
1.4rc1
1.4
1.4.1
1.4.2
1.4.3
1.4.4
1.4.5
1.4.6
1.5rc1
1.5
1.5.1
1.5.2
1.5.3
1.6rc1
1.6
1.6.1
1.6.2
1.6.3
1.7rc1
1.7
1.8rc1
1.8
1.8.1
1.8.2
1.9rc1
1.9
1.9.1
1.10rc1
1.10
1.10.1
1.11rc1
1.11
1.11.1
1.12rc1
1.12
1.12.1
1.12.2
1.12.3
1.12.4
1.12.5
1.12.6
1.13rc1
1.13
1.13.1
1.13.2
1.13.3
1.13.4
2.*
2.0b1
2.0rc1
2.0
2.0.1
2.0.2
2.1rc1
2.1rc2
2.1
2.1.1
2.1.2
2.1.3
2.2rc1
2.2rc2
2.2
2.2.1
2.2.2
2.3rc1
2.3rc2
2.3
2.4rc1
2.4
2.5rc1
2.5
2.5.1
2.5.2
2.6rc1
2.6
2.6.1
2.6.2
2.6.3
2.7rc1
2.7rc2
2.7
2.7.1
2.7.2
2.7.3
2.7.4
2.8rc1
2.8
2.8.1
2.8.2
2.9rc1
2.9
2.9.1
2.9.2
2.9.3
2.10rc1
2.10rc2
2.10
2.10.1
2.10.2
2.11rc1
2.11
2.11.1
2.11.2
2.11.3
2.11.4
2.11.5
2.11.6
2.11.7
2.11.8
2.11.9
2.12rc1
2.12
2.12.1
2.12.2
2.12.3
2.12.4
2.12.5
2.12.6
2.13rc1
2.13rc2
2.13rc3
2.13
2.13.1
2.13.2
2.13.3
2.13.4
2.13.5
2.14rc1
2.14
2.14.1
2.14.2
2.15rc1
2.15rc2
2.15
2.15.1
2.15.2
2.15.3
2.15.4
2.15.5
2.15.6
2.16rc1
2.16rc2
2.16
2.16.1
2.16.2
2.16.3
3.*
3.0rc1
3.0rc2
3.0rc3
3.0
3.0.1
3.0.2
3.0.3
4.*
4.0rc1
4.0rc2
4.0
4.0.1
4.0.2
4.0.3
4.0.4
4.1rc1
4.1
4.1.1
4.1.2
4.1.3
4.1.4
4.1.5
4.1.6
4.1.7
4.1.8
4.1.9
4.2rc1
4.2
4.2.1
4.2.2
4.2.3
4.2.4
5.*
5.0rc1
5.0
5.0.1
5.0.2
5.0.3
5.0.4
5.0.5
5.1rc1
5.1
5.1.1
5.1.2
5.1.3
5.2rc1
5.2
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.2.6
5.2.7
5.2.8
6.*
6.0rc1
6.0
6.0.1
6.0.2
6.0.3
6.0.4
6.0.5
6.0.6
6.1rc1
6.1rc2
6.1
6.1.1
6.1.2
6.1.3
6.2rc1
6.2
6.2.1
6.2.2
6.2.3
6.2.4
6.3rc1
6.3rc2
6.3
6.3.1
6.3.2
6.3.3
6.3.4
6.3.5
6.3.6
6.3.7
6.3.8
6.4rc1
6.4
6.4.1
6.4.2
7.*
7.0rc1
7.0
7.0.1
7.0.2
7.0.3
7.0.4
7.0.5
7.0.6
7.0.7

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-f2p5-j6fg-5cxf/GHSA-f2p5-j6fg-5cxf.json"

PyPI / wagtail

Package

Name
wagtail
View open source insights on deps.dev
Purl
pkg:pypi/wagtail

Affected ranges

Type
ECOSYSTEM
Events
Introduced
7.1
Fixed
7.3.3

Affected versions

7.*
7.1
7.1.1
7.1.2
7.1.3
7.2rc1
7.2
7.2.1
7.2.2
7.2.3
7.3rc1
7.3
7.3.1
7.3.2

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-f2p5-j6fg-5cxf/GHSA-f2p5-j6fg-5cxf.json"

PyPI / wagtail

Package

Name
wagtail
View open source insights on deps.dev
Purl
pkg:pypi/wagtail

Affected ranges

Type
ECOSYSTEM
Events
Introduced
7.4
Fixed
7.4.2

Affected versions

7.*
7.4
7.4.1

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-f2p5-j6fg-5cxf/GHSA-f2p5-j6fg-5cxf.json"