CVE-2020-18703
Improper Restriction of XML External Entity Reference in Quokka
XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.
- Record
CVE-2020-18703- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-611
- Updated
- 2026-11-02
CVE List No score
XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.
- Record
CVE-2020-18703- Updated
- 2026-11-02
EUVDEUVD-2021-0218 No score
XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.
- Record
EUVD-2021-0218- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-3xg5-6c3j-vp8x
Improper Restriction of XML External Entity Reference in Quokka
XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.
- Record
GHSA-3xg5-6c3j-vp8x- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-611
- Updated
- 2026-11-02
OSV
XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.
- Record
CVE-2020-18703- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-3xg5-6c3j-vp8x
Improper Restriction of XML External Entity Reference in Quokka
XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.
- Record
GHSA-3xg5-6c3j-vp8x- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-611
- Updated
- 2026-11-02
OSVPYSEC-2021-144 No score
XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.
- Record
PYSEC-2021-144- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
quokkaPyPI |
through 0.4.0 | None known |
quokkaPyPI |
through 0.4.0, plus listed versions 0.0.1.dev840.1.00.2.00.3.00.3.1 Show 5 moreShow less0.3.20.3.30.3.40.3.6.dev10.3.7.dev1 |
None known |
quokkaPyPI |
All versions, plus listed versions 0.0.1.dev840.1.00.2.00.3.00.3.1 Show 8 moreShow less0.3.20.3.30.3.40.3.6.dev10.3.7.dev10.4.00.4.1.dev220.4.1.dev6 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-18703 is a critical vulnerability (CVSS 9.8) in Quokka Project Quokka, published August 16, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.77%, the 86th percentile. No source names a fixed version.