MEDIUM
Cross-site scripting (XSS) vulnerability in the _keyify function in mistune.py in Mistune before 0.8.1 allows remote attackers to inject arbitrary web script or HTML by leveraging failure to escape the "key" argument
Published Dec 29, 2017
5.1
MEDIUMCVSS 4.0
EPSS 2.23%
Description
Cross-site scripting (XSS) vulnerability in the _keyify function in mistune.py in Mistune before 0.8.1 allows remote attackers to inject arbitrary web script or HTML by leveraging failure to escape the "key" argument.
Affected products
No data.
Configuration 1
- < 0.8.1
Configuration 2
- 26
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
5.1 MEDIUM GHSA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Attack Vector Network
Attack Complexity Low
Attack Requirements None
Privileges Required None
User Interaction Active
Vulnerable System Confidentiality None
Vulnerable System Integrity None
Vulnerable System Availability None
Subsequent System Confidentiality Low
Subsequent System Integrity Low
Subsequent System Availability None
6.1 MEDIUM GHSA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality Impact Low
Integrity Impact Low
Availability Impact None
6.1 MEDIUM NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality Impact Low
Integrity Impact Low
Availability Impact None
4.3 MEDIUM NVD
AV:N/AC:M/Au:N/C:N/I:P/A:N
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact None
Integrity Impact Partial
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
2.23% 0.02235
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.02235
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.23% (0.02235) | 82.17th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.20% (0.02198) | 80.11th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.58% (0.00580) | 66.99th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.14% (0.00135) | 50.54th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.14% (0.00135) | 48.06th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.19% (0.00195) | 55.52th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.39% (0.01386) | 32.11th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.39% (0.01386) | 0.00th | v1 |
Weaknesses (1)
References (8)
- https://bugzilla.redhat.com/show_bug.cgi?id=1524596 x_refsource_CONFIRMIssue TrackingThird Party AdvisoryVDB Entry
- https://github.com/advisories/GHSA-98gj-wwxm-cj3h Advisory
- https://github.com/lepture/mistune/blob/master/CHANGES.rst x_refsource_CONFIRMRelease NotesThird Party Advisory
- https://github.com/lepture/mistune/commit/5f06d724bc05580e7f203db2d4a4905fc1127f98 x_refsource_CONFIRMPatchThird Party Advisory
- https://github.com/pypa/advisory-database/tree/main/vulns/mistune/PYSEC-2017-18.yaml
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NUR3GMHQBMA3UC4PFMCK6GCLOQC4LQQC/ vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NUR3GMHQBMA3UC4PFMCK6GCLOQC4LQQC
- https://nvd.nist.gov/vuln/detail/CVE-2017-16876
| Link | Providers | Tags |
|---|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1524596 | x_refsource_CONFIRMIssue TrackingThird Party AdvisoryVDB Entry | |
| https://github.com/advisories/GHSA-98gj-wwxm-cj3h | Advisory | |
| https://github.com/lepture/mistune/blob/master/CHANGES.rst | x_refsource_CONFIRMRelease NotesThird Party Advisory | |
| https://github.com/lepture/mistune/commit/5f06d724bc05580e7f203db2d4a4905fc1127f98 | x_refsource_CONFIRMPatchThird Party Advisory | |
| https://github.com/pypa/advisory-database/tree/main/vulns/mistune/PYSEC-2017-18.yaml | ||
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NUR3GMHQBMA3UC4PFMCK6GCLOQC4LQQC/ | vendor-advisoryx_refsource_FEDORA | |
| https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NUR3GMHQBMA3UC4PFMCK6GCLOQC4LQQC | ||
| https://nvd.nist.gov/vuln/detail/CVE-2017-16876 |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Dec 29, 2017
Updated Aug 5, 2024
Reserved Nov 17, 2017
Link CVE-2017-16876
CISA Vulnrichment
GHSA-98GJ-WWXM-CJ3H Updated n/a