GHSA-x5g3-w747-2h8q

Source

https://github.com/advisories/GHSA-x5g3-w747-2h8q

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-x5g3-w747-2h8q/GHSA-x5g3-w747-2h8q.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-x5g3-w747-2h8q

Aliases

Published

2026-08-28T18:41:35Z

Modified

2026-09-10T12:25:27Z

Severity

9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H CVSS Calculator

Summary

plone.app.portlets vulnerable to denial of service via RSS feed portlet

Details

Impact

By adding an RSS portlet, and giving this a link to a very large file, a member can cause a denial of service attack, because Plone will use lots of memory. The member could also use different urls to try to get information about the internal network and open port numbers (SSRF). A malicious RSS feed could cause stored XSS, when the url of a feed item is a javascript url.

Patches

The problem has been patched in plone.app.portlets.

For Plone 6.2: upgrade to plone.app.portlets 7.0.2
For Plone 6.1: upgrade to plone.app.portlets 6.0.4
For Plone 6.0: upgrade to plone.app.portlets 5.0.8

Workarounds

If upgrading is not immediately possible:

Restrict who can manage portlets: remove the plone.app.portlets.ManageOwnPortlets permission from untrusted roles, and limit Manage portlets to trusted administrators (usually this is already restricted to the Manager and Site Administrator roles).
Where the RSS portlet is not needed, unregister it so it cannot be added. This would need to be done by editing a portlets.xml in your own code, so it is not a quick fix.

References

This is similar to this plone.app.event vulnerability. It was discovered by the Plone Security Team by thinking of similar cases to the plone.app.event problem.

Database specific

{
    "cwe_ids":  [
        "CWE-400"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-08-28T18:41:35Z",
    "nvd_published_at":  null,
    "severity":  "CRITICAL"
}

References

Affected packages

PyPI / plone-app-portlets

Package

Name: plone-app-portlets; View open source insights on deps.dev
Purl: pkg:pypi/plone-app-portlets

Affected ranges

Type: ECOSYSTEM
Events: Introduced

7.0.0

Fixed

7.0.2

Affected versions

7.*

7.0.0

7.0.1

Database specific

last_known_affected_version_range

"<= 7.0.1"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-x5g3-w747-2h8q/GHSA-x5g3-w747-2h8q.json"

PyPI / plone-app-portlets

Package

Name: plone-app-portlets; View open source insights on deps.dev
Purl: pkg:pypi/plone-app-portlets

Affected ranges

Type: ECOSYSTEM
Events: Introduced

6.0.0

Fixed

6.0.4

Affected versions

6.*

6.0.0

6.0.1

6.0.2

6.0.3

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-x5g3-w747-2h8q/GHSA-x5g3-w747-2h8q.json"

PyPI / plone-app-portlets

Package

Name: plone-app-portlets; View open source insights on deps.dev
Purl: pkg:pypi/plone-app-portlets

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

5.0.8

Affected versions

1.*

1.0b1.1

1.0a2

1.0b1

1.0b2

1.0b3

1.0rc1

1.0rc2

1.0

1.0.1

1.0.1.1

1.0.2

1.0.3

1.0.5

1.0.6

1.1.0a1

1.1rc1

1.1.0

1.1.2

1.1.3

1.1.5

1.1.5.1

1.1.6

1.2b1

1.2rc1

1.2rc3

1.2

1.2.1

2.*

2.0a1

2.0a2

2.0a3

2.0a4

2.0b1

2.0b2

2.0b3

2.0b4

2.0b5

2.0b6

2.0b7

2.0b8

2.0b9

2.0b10

2.0b11

2.0

2.0.1

2.0.2

2.0.3

2.0.4

2.1.0

2.1.2

2.1.3

2.1.4

2.1.5

2.1.6

2.1.7

2.1.8

2.2

2.2.1

2.2.2

2.2.3

2.2.4

2.2.5

2.2.6

2.3a1

2.3

2.3.1

2.3.2

2.3.3

2.3.4

2.3.5

2.3.6

2.3.7

2.3.8

2.3.9

2.4.0

2.4.1

2.4.2

2.4.3

2.4.4

2.4.5

2.4.6

2.4.7

2.4.8

2.5a1

2.5.0

2.5.1

2.5.2

2.5.3

2.5.4

2.5.5

2.5.6

2.5.7

3.*

3.0

3.0.1

3.0.2

3.0.3

3.0.4

3.0.5

3.0.6

3.0.7

3.0.8

3.0.9

3.0.10

3.1

3.1.1

3.1.2

3.1.3

3.1.4

3.1.5

3.1.6

4.*

4.0.0

4.1.0

4.1.1

4.1.2

4.2

4.2.1

4.2.2

4.2.3

4.3.0

4.3.1

4.3.2

4.3.3

4.3.4

4.4.0

4.4.1

4.4.2

4.4.3

4.4.4

4.4.5

4.4.6

4.4.7

4.4.8

4.4.9

5.*

5.0.0a1

5.0.0a2

5.0.0a3

5.0.0a4

5.0.0a5

5.0.0a6

5.0.0a7

5.0.0a8

5.0.0a9

5.0.0a10

5.0.0b1

5.0.0b2

5.0.0

5.0.1

5.0.2

5.0.3

5.0.4

5.0.5

5.0.6

5.0.7

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-x5g3-w747-2h8q/GHSA-x5g3-w747-2h8q.json"