VulnerabilityModified

CVE-2017-16876

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.

MEDIUM 6.1EPSS 2.23%

Does this matter?

Lower severity and a low EPSS score (2.23%). Track it; it rarely justifies an emergency change on its own.

Description

CVSS 3.0: 6.1 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS: 2.23% probability · 83th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-79
Affected: mistune project/mistune · fedoraproject/fedora
Source: cve@mitre.org

EPSS trend

EPSS 2.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1524596Issue Tracking, Third Party Advisory, VDB Entry
https://github.com/lepture/mistune/blob/master/CHANGES.rstRelease Notes, Third Party Advisory
https://github.com/lepture/mistune/commit/5f06d724bc05580e7f203db2d4a4905fc1127f98Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NUR3GMHQBMA3UC4PFMCK6GCLOQC4LQQC/
https://bugzilla.redhat.com/show_bug.cgi?id=1524596Issue Tracking, Third Party Advisory, VDB Entry
https://github.com/lepture/mistune/blob/master/CHANGES.rstRelease Notes, Third Party Advisory
https://github.com/lepture/mistune/commit/5f06d724bc05580e7f203db2d4a4905fc1127f98Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NUR3GMHQBMA3UC4PFMCK6GCLOQC4LQQC/

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.