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CVE-2020-28735

SSRF attacks via tracebacks in Plone

8.8 HighFix available

CVE-2020-28735 is a high vulnerability (CVSS 8.8) in Plone, published December 30, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.45%, the 73rd percentile. Fixed in plone 5.2.3.

What does this mean?
Severity
8.8 HighCVSS 3.1, NVD
Exploit chance
1.45%EPSS, 73rd percentile
Exploitation
None knownNot on CISA’s or ENISA’s lists
Fixed in
5.2.3plone +9 more

Description

Plone before 5.2.3 allows SSRF attacks via the tracebacks feature (only available to the Manager role).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

1.45%Up 0.6 points since Apr 14, 2021
90%50%10%1%

Affected products

Affected packages

Affected packages
PackageAffectedFixed
plone
PyPI
before 5.2.3
5.2.3
plone-app-event
PyPI
before 3.2.10
3.2.10
plone-app-theming
PyPI
before 4.1.6
4.1.6
plone-app-dexterity
PyPI
before 2.6.8
2.6.8
plone-supermodel
PyPI
before 1.6.3
1.6.3
plone
PyPI
before 5.2.3, plus listed versions
3.23.2.13.2.23.2.33.2a1
Show 45 moreShow less
3.2rc13.33.3.13.3.23.3.33.3.43.3.53.3.63.3b13.3rc13.3rc23.3rc33.3rc43.3rc54.04.0.14.0.104.0.24.0.34.0.44.0.54.0.64.0.74.0.84.0.94.0a14.0a24.0a34.0a44.0a54.0b14.0b24.0b34.0b44.0b54.0rc14.14.1.14.1.24.1.34.1.44.1.54.1.64.1a14.1a2
5.2.3
plone-app-event
PyPI
before 3.2.10, plus listed versions
1.01.0.11.0.21.0.31.0.4
Show 45 moreShow less
1.0.51.0.61.0a11.0a21.0b11.0b21.0b31.0b41.0b51.0b61.0b71.0b81.0rc11.0rc21.0rc31.11.1.11.1.101.1.111.1.121.1.131.1.21.1.31.1.41.1.51.1.61.1.71.1.81.1.a11.1b11.21.2.11.2.21.2.31.2.41.2.51.2.61.2.72.02.0.12.0.102.0.112.0.122.0.132.0.14
3.2.10
plone-app-theming
PyPI
before 4.1.6, plus listed versions
1.01.0.11.0.21.0.31.0.4
Show 45 moreShow less
1.0b11.0b21.0b31.0b41.0b51.0b61.0b71.0b81.0b91.11.1.11.1.21.1.31.1.41.1.51.1.61.1.71.1.81.1a11.1a21.1b11.1b21.2.01.2.11.2.101.2.111.2.121.2.131.2.141.2.151.2.161.2.171.2.181.2.191.2.21.2.31.2.41.2.51.2.61.2.71.2.81.2.91.3.01.3.11.3.2
4.1.6
plone-app-dexterity
PyPI
before 2.6.8, plus listed versions
1.01.0.11.0.21.0.31.0a1
Show 45 moreShow less
1.0a21.0a31.0a41.0a51.0a61.0a71.0b11.0b21.0b31.0b41.0rc11.11.21.2.11.2.22.02.0.12.0.102.0.112.0.122.0.132.0.142.0.152.0.162.0.172.0.182.0.192.0.22.0.32.0.42.0.52.0.62.0.72.0.82.0.92.1.02.1.12.1.102.1.112.1.122.1.132.1.142.1.152.1.162.1.17
2.6.8
plone-supermodel
PyPI
before 1.6.3, plus listed versions
1.01.0.11.0.21.0.31.0.4
Show 32 moreShow less
1.0b11.0b21.0b31.0b41.0b51.0b61.0b71.0b81.11.1.11.1.21.1.31.1.41.2.01.2.11.2.21.2.31.2.41.2.51.2.61.2.71.3.01.3.11.3.21.3.31.3.41.4.01.4.11.5.01.6.01.6.11.6.2
1.6.3

What each source reports

NVD Score used8.8

Plone before 5.2.3 allows SSRF attacks via the tracebacks feature (only available to the Manager role).

Record
CVE-2020-28735
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
6.5 MediumAV:N/AC:L/Au:S/C:P/I:P/A:P
Weakness
CWE-918
Updated
2026-11-02
CVE ListNo score

Plone before 5.2.3 allows SSRF attacks via the tracebacks feature (only available to the Manager role).

Record
CVE-2020-28735
Updated
2026-11-02
EUVDEUVD-2020-0141No score

Plone before 5.2.3 allows SSRF attacks via the tracebacks feature (only available to the Manager role).

Record
EUVD-2020-0141
Updated
2026-11-03
GitHub AdvisoriesGHSA-x7wf-5mjc-6x768.7

SSRF attacks via tracebacks in Plone

Plone before 5.2.3 allows SSRF attacks via the tracebacks feature (only available to the Manager role).

Record
GHSA-x7wf-5mjc-6x76
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-918
Updated
2026-11-02
OSV8.8

Plone before 5.2.3 allows SSRF attacks via the tracebacks feature (only available to the Manager role).

Record
CVE-2020-28735
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVGHSA-x7wf-5mjc-6x768.7

SSRF attacks via tracebacks in Plone

Plone before 5.2.3 allows SSRF attacks via the tracebacks feature (only available to the Manager role).

Record
GHSA-x7wf-5mjc-6x76
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-918
Updated
2026-11-02
Show 5 moreShow less
OSVPYSEC-2026-28818.7

SSRF attacks via tracebacks in Plone

Plone before 5.2.3 allows SSRF attacks via the tracebacks feature (only available to the Manager role).

Record
PYSEC-2026-2881
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVPYSEC-2026-28848.7

SSRF attacks via tracebacks in Plone

Plone before 5.2.3 allows SSRF attacks via the tracebacks feature (only available to the Manager role).

Record
PYSEC-2026-2884
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVPYSEC-2026-28878.7

SSRF attacks via tracebacks in Plone

Plone before 5.2.3 allows SSRF attacks via the tracebacks feature (only available to the Manager role).

Record
PYSEC-2026-2887
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVPYSEC-2026-7378.7

SSRF attacks via tracebacks in Plone

Plone before 5.2.3 allows SSRF attacks via the tracebacks feature (only available to the Manager role).

Record
PYSEC-2026-737
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVPYSEC-2020-247No score

Plone before 5.2.3 allows SSRF attacks via the tracebacks feature (only available to the Manager role).

Record
PYSEC-2020-247
Updated
2026-11-02

History

History
RecordedChangedSources
facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

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