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CVE-2020-28735

28
FAUCET Score

CVE-2020-28735 describes a Server-Side Request Forgery (SSRF) vulnerability in Plone versions prior to 5.2.3, specifically within the tracebacks feature. This high-severity vulnerability (CVSS 8.8) allows an authenticated attacker with Manager role privileges to initiate requests from the server, potentially leading to full compromise of confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.2.3CPE matchmatch criteria
cpe:2.3:a:plone:plone:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.42%
Probability of exploitation in next 30 days
EPSS Percentile
70.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0142 is in the 67th percentile among its peer group of 17,822 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: PloneFixed in: 5.2.3
pippatch availablevia ghsa
Product: plone.app.eventFixed in: 3.2.10
pippatch availablevia ghsa
Product: plone.app.themingFixed in: 4.1.6
pippatch availablevia ghsa
Product: plone.app.dexterityFixed in: 2.6.8
pippatch availablevia ghsa
Product: plone.supermodelFixed in: 1.6.3

Vendor Advisories (1)

pipGHSA-x7wf-5mjc-6x76high

SSRF attacks via tracebacks in Plone

Apr 7, 2021

References

dist.plone.org / release/5.2.3/RELEASE-NOTES.txt
Release NotesVendor Advisory
github.com / plone/Products.CMFPlone/issues/3209
PatchThird Party Advisory
misakikata.com / codes/plone/python-en.html
Broken Link